Designations Of U.S. Military Aero Engines

Copyright © 2000-2005 Andreas Parsch

1 Introduction

2 Piston Engines

3 Jet and Turbine Engines, 1946 - 1968

4 Rocket Engines

5 The Current System (MIL-HDBK-1812)

5.1 Air-Breathing Engines
5.2 Rocket Engines

6 Sources

1 Introduction

For the engines of its first aircraft, the US military services used the manufacturers' names. Soon after World War I, however, more formal designation systems were devised not only for the aircraft themselves but also for their engines. When jet, turbine and rocket engine development started at the end of World War II, formal designations were assigned to these types of engines almost from the beginning. In the last decades, however, there is a trend towards using manufacturers' designations again for engines which were not developed specifically for the military.

The following graph shows the various documents and standards used to define the aero engine designation systems. A bold black arrow indicates, that the system underwent no or only minor changes, when defined in a new document. A light gray arrow indicates a major change, i.e. the designation system was superseded by a completely different one.

This article explains the various engine designation systems and lists all aircraft and missile engines, which received a military designation, and the aircraft or missiles which used them. Because the focus of the article is on the designations, I don't try to give specific details for the engines (like power rating, etc.). These details can differ significantly between models of the same basic engine anyway.
For each engine type, I try to provide a complete list of US military aircraft, which used this engine. To keep these lists reasonably short, I use the following terse format for an aircraft type:

(Number of engines)Military Designation

Usually only the basic designation (without specific model letters or numbers) is given. That means, that all - or almost all - models of this type used the engine. Exceptions are listed as users of the approriate alternate engine. If an entry is in brackets, the type was planned to use the engine, but not a single example was completed before the aircraft and/or engine was cancelled. Additionally, each list of aircraft designations is headed by a descriptor of the designation system used.
To make use of the aircraft listings, you must of course understand the aircraft designations. I have links to several sites explaining and listing aircraft designations. I think, the most useful general purpose source for finding some details about an aircraft given its designation is Andrew Chorney's site.

2 Piston Engines

Since the early 1920's, piston engines are designated by a system based on cylinder arrangement and total piston displacement. This designation system was later formally defined in Air Force/Navy Aeronautical (ANA) Bulletin 395, which was replaced by MIL-STD-1557 on 28 January 1974. The latter document was superseded by the current MIL-HDBK-1812 (originally MIL-STD-1812) on 28 February 1991.

Examples:		V	-	1650	-	7
		R	-	4360	-	35	C
	X	O	-	470	-	5
	(5)	(1)		(2)		(3)	(4)

The letter (1) indicates the cylinder arrangement of the engine:

• H - Double Opposed
• IV - Inverted Vee
• L - In-Line
• O - Opposed
• R - Radial
• V - Vee

Optionally, the letter could be prefixed by one of the modification letters:

• D - Diesel Engine
• G - Geared Engine

MIL-STD-1557 dropped all letters and prefixes, except O, R and V, and added the designator

• RC - Rotating Combustion

The number (2) is the total piston displacement of the engine, rounded to the next 5 cubic inches.

(3) is the model number for a particular version of the engine. The Army and Air Force used odd numbers from 1 up, while the Navy used even numbers from 2 up. In MIL-STD-1557, this was revised. The Air Force was assigned model numbers 100 to 399, the Navy 400 to 699 and the Army 700 to 999. This was done to match the procedure for jet/turbine model numbers defined by MIL-STD-879.

(4) is an optional letter for designating minor modifications of an engine model. Letters are assigned alphabetically from A on (I and O are not used). The letter W is reserved for engines with water injection. In MIL-STD-1557, the letter T was reserved for training (i.e. non-flying) engines. T could be combined with other letters, e.g. the training version of the R-1830-92A engine would be designated R-1830-92AT.

(5) is an optional status prefix:

• X - Experimental
• Y - Service Test
• Z - Obsolete

This designation system could lead to the same basic (arrangement - displacement) designation for two different engines. E.g., the Liberty 12 engine of the 1920s and the Merlin engine of WW II were both officially known as V-1650. However, I don't know any case, where this occured for contemporary engines, so this did not pose problems in "real life".
(It is also possible, that the displacement was sometimes rounded to the next 10 cubic inches to get different designations for engines with similar displacement.)

Note: While this system was theoretically revised by MIL-STD-1812, it is - to all intents and purposes - still in use today, mainly because of two reasons:

• Existing engines are not redesignated and there is no new piston engine development specifically for the military.
• Many manufacturers of commercial engines (e.g. Lycoming and Continental) designate their engines according to the "arrangement-displacement" system, which makes it very convenient for the military to use these commercial designations, when such an engine is procured.

Designation List:

Designation	Manufacturer and Model	Remarks; Aircraft
H-2470	Lycoming XH-2470-1	Army/AF(1924-1962): (1)P-54 Navy(1922-1962): (1)F14C-1
H-2600	Pratt & Whitney X-1800-SA2G
H-3730	Pratt & Whitney
H-4070	Menasco XH-4070-1

IV-1430	Continental XI-1430-1	Army/AF(1924-1962): (2)P-49, [(1)P-52], [(1)P-53], (2)P-67
IV-2040	Menasco XIV-2040-1
IV-2220	Chrysler XIV-2220-1

L-330	Martin
L-365	Menasco Pirate C-4	Army/AF(1924-1962): (1)PT-20
L-375	DeHavilland Gipsy Major	Army/AF(1924-1962): (1)PT-24
L-390	Ranger 6-390-B
L-395	Menasco	Navy(1922-1962): (1)JH
L-410	Ranger 6-410-B2
L-440	Ranger 6-440-C2	Army/AF(1924-1962): (1)UC-61K, (1)XUC-86A, (2)OA-14, (2)PG-2, (1)PT-19, (1)PT-26 Navy(1922-1962): (2)J4F, (1)J2K, (1)NR
L-510	Miller Double 4-255	Army/AF(1924-1962): [(1)P-57]
L-825	Liberty 6	Army(1919-1924): (1)PN-1

O-15	Righter	Army/AF(1924-1962): (1)OQ-2, (1)OQ-3, (1)OQ-7, (1)OQ-13 Navy(1922-1962): (1)TDD
O-40	Muncie Gear
O-45	Righter/Kiekhaefer	Army(1924-1962): (1)OQ-6, (1)OQ-14, (1)OQ-15, (1)OQ-16, (1)OQ-17 Navy(1922-1962): (1)KD3G, (1)KD4G, (1)KDR, (1)TDD-3/4
O-90	McCulloch	Army(1924-1962): (1)OQ-6A, (1)OQ-19 Navy(1922-1962): (1)KD2R
O-100	McCulloch	Navy(1922-1962): (1)KD6G, (1)KD2R-3/5 Missiles: (1)MQM-33, (1)MQM-36
O-145	Lycoming O-145-B2	Army/AF(1924-1962): (1)UC-90A, (1)C-92, (1)C-95, (1)L-2D/F/J, (1)L-3G/H, (1)L-4C/G
O-150	Franklin 4-AC-150	Army/AF(1924-1962): (1)L-2E/G/K/L
O-170	Continental A-65	Army/AF(1924-1962): (1)C-83, (1)UC-90, (1)L-2, (1)L-3, (1)L-4, (1)L-8, (1)O-54, (1)O-55, (1)O-57(L-2), (1)O-58(L-3), (1)O-59(L-4) Navy(1922-1962): (1)NE
O-175	Franklin 4-AC-176-B2	Army/AF(1924-1962): (1)L-3D, (1)L-4D
O-180	Franklin 4-AC-176-F3
O-190	Continental C-85	Army/AF(1924-1962): (1)L-16
O-200	Franklin 4-AC-199-E4	Army/AF(1924-1962): (1)C-65, (1)L-6, (1)L-7, (1)L-9, (1)O-63(L-6), (1)PQ-8 Navy(1922-1962): (1)XTDC-1
O-200	Continental (Teledyne) O-200-A	Joint(1962+): (1)X-26B
O-205	Continental	Army/AF(1924-1962): (1)L-16B, (1)L-18
O-235	Lycoming O-235-A	Navy(1922-1962): (1)AE, (1)HE(AE)
O-235	Lycoming (Textron) O-235-L2C	Joint(1962+): (1)TG-7, (1)RG-8
O-290	Lycoming O-290-B	Army/AF(1924-1962): (1)C-107, (1)H-24, (1)L-14, (1)L-15, (1)L-21(U-7), (1)PQ-8A, (1)R-9 Navy(1922-1962): (1)TDC Joint(1962+): (1)U-7
O-300	Franklin 6-AC-298-F3	Army/AF(1924-1962): [(1)PQ-9], [(2)PQ-10], (1)PQ-13, (1)PQ-14 Navy(1922-1962): (1)TD2C
O-335	Aircooled Motors (Franklin)	Army/AF(1924-1962): (1)H-13, (1)H-23, (1)H-30, (1)T-35 Navy(1922-1962): (1)HTE, (1)HTL-1/3/5, (1)HUM
O-360	Lycoming	Joint(1962+): (1)H-55
O-360	Continental	Joint(1962+): (2)O-2, (1)O-3, (1)T-41, (1)XV-8A
O-405	Franklin 6-ACV-405	Army/AF(1924-1962): (2)BQ-1, (1)XUC-86B, (1)PQ-15, (1)R-6, [(1)R-7], (1)R-8 Navy(1922-1962): (1)HOS, (1)TD3C
O-425	Franklin 6-AC-425	Army/AF(1924-1962): (1)H-18, (1)L-13, [(1)OA-15]
O-435	Lycoming O-435-A	Army/AF(1924-1962): (2)XBQ-2, (2)BQ-4, (1)H-13H/J/L/M/N/P/Q/S/T, (1)H-22, (1)L-5, (1)L-22(L-17D), (2)L-23(U-8), (1)L-24, (1)L-26(U-9), (1)O-62(L-5), (1)PT-25, (1)PQ-12 Navy(1922-1962): (1)HO5S, (1)HTK, (1)HTL-2/4/6/7(H-13), (1)HUL(H-13), (1)OY, (2)TDR Joint(1962+): (2)U-8, (1)U-9B
O-470	Continental	Army/AF(1924-1962): (1)L-17(U-18), (1)L-19(O-1), (2)L-27(U-3), (1)T-34A/B Navy(1922-1962): (1)OE(O-1) Joint(1962+): (1)O-1, (2)U-3, (1)U-17, (1)U-18
O-480	Lycoming GO-480-B2	Army/AF(1924-1962): (2)L-23D/E/F(U-8), (1)L-26B/C(U-4,U-9), (1)L-28(U-10) Joint(1962+): (1)U-4B, (2)U-8D/E/F, (1)U-9C, (1)U-10
O-520	Continental	Joint(1962+): (2)C-28, (2)T-42, (1)U-17B, (1)U-22, (1)U-26
O-540	Franklin 8-ACGSA-538
O-540	Lycoming (Textron)	Navy(1922-1962): (2)UO(U-11) Joint(1962+): (1)T-3, (2)U-11
O-550	Continental (Teledyne) GIO-550A	Joint(1962+): (2)U-38
O-805	Franklin 12-ACGSA-806	Army/AF(1924-1962): [(2)BQ-5]
O-580	Lycoming	Army/AF(1924-1962): (1)H-31
O-1230	Lycoming O-1230-A	Army/AF(1924-1962): (1)XA-19A

R-250	General Motors X-250-D
R-265	Ken-Royce LeBlond 5-G	Army/AF(1924-1962): (1)UC-102
R-270	Lambert
R-370	Ken-Royce LeBlond 7-G	Army/AF(1924-1962): (1)UC-102A
R-370	Kinner K-5	Army/AF(1924-1962): (1)PT-6, (1)PT-7 Navy(1922-1962): (1)N2Y
R-420	Warner Scarab	Army/AF(1924-1962): (1)C-10
R-440	Kinner B-5	Army/AF(1924-1962): (1)PT-16, (1)PT-20A, (1)PT-21
R-500	Warner Super Scarab	Army/AF(1924-1962): (1)C-61, (1)UC-77C/D, (1)C-80, (1)C-94 Navy(1922-1962): (1)GK
R-540	Kinner R-5-2	Army/AF(1924-1962): (1)PT-22
R-540	Wright Whirlwind 5 (J-6)	Army/AF(1924-1962): (1)YPT-9, (1)YPT-10/B
R-545	Continental A-70	Army/AF(1924-1962): (1)YPT-9A, (1)YPT-10A, (1)Y1PT-11
R-550	Warner Super Scarab	Army/AF(1924-1962): (1)R-4
R-600	Curtiss Challenger	Army/AF(1924-1962): (1)PT-5, (1)Y1PT-11A
R-670	Continental R-670-A	Army/AF(1924-1962): (1)UC-72D, (1)PT-14, (1)PT-17, (1)PT-23, (1)PT-27 Navy(1922-1962): (1)JW, (1)N2S-1/3/4, (1)N2T
R-680	Lycoming R-680-A	Army/AF(1924-1962): (2)AT-8, (2)AT-9, (2)AT-10, (1)AT-19, (1)XBQ-2A, (1)UC-72C, (1)C-81, (3)C-91, (1)L-1, (1)L-12, (1)O-49(L-1), (1)YPT-9B, (1)YPT-10C, (1)PT-11C/D, (1)PT-13, (1)T-31 Navy(1922-1962): (1)NP, (1)NQ, (1)N2S-2/5, (1)N4Y, (1)R3Q
R-720	Kinner C-5	Army/AF(1924-1962): (1)YPT-9C, (1)YPT-10D, (1)PT-11B
R-755	Jacobs L-4	Army/AF(1924-1962): (2)AT-17, (1)UC-43J, (1)UC-72K, (2)C-78, (1)C-126, (1)G-1, (1)PT-18, (1)R-3 Navy(1922-1962): (2)JRC
R-760	Wright Whirlwind 7 (J-6)	Army/AF(1924-1962): (1)UC-70C, (1)UC-72B/F, (1)UC-77A, (1)UC-81B/G/H/J, (1)C-88, (1)PT-15 Navy(1922-1962): (1)JK, (1)J2W, (1)N2C, (1)N3N, (1)N5N, (1)NY-3, (1)OO
R-790	Wright Whirlwind 9 (J-5)	Army(1919-1924): (1)NO-2 Army/AF(1924-1962): (1)AT-5, (3)C-2, (3)C-3, (1)O-14, (1)O-15, (1)O-17, (1)PT-2, (1)PT-3 Navy(1922-1962): (1)NK, (1)NS, (1)NY, (1)N3Y, (2)XPS-1, (3)TA(RA), (3)RA
R-830	Jacobs L-5	Army/AF(1924-1962): (1)UC-43D/G, (1)UC-70D, (1)UC-72E/H/M/N
R-915	Jacobs L-6	Army/AF(1924-1962): (2)AT-20, (1)UC-43C, (1)UC-70A/B, (1)UC-72A/G/J/L/P, (1)O-60, [(1)O-61], (1)R-2
R-975	Wright Whirlwind 9 (J-6)	Army/AF(1924-1962): (1)BT-3, (1)BT-6, (1)BT-9, (1)BT-15, (2)BQ-6, (3)C-7, (3)C-9, (2)C-21, (2)UC-36C, (1)UC-43A/E/F/H/K, (1)UC-77, (1)G-2, (1)H-25, (2)OA-3, (1)V-1 Navy(1922-1962): (1)F9C, (1)HJP(HUP), (1)HJS, (1)HUP, (1)JB, (2)RC, (2)RD, (1)R3O, (1)SNC, (2)TD3R
DR-980	Packard DR-980 Diesel	Army/AF(1924-1962): (1)PT-8
R-985	Pratt & Whitney Wasp Junior	Army/AF(1924-1962): (2)AT-7, (2)AT-11, (1)BT-5, (1)BT-7, (1)BT-8, [(1)BT-11], (1)BT-12, (1)BT-13, (1)BT-14, (1)BT-16, (1)BT-17, (2)C-26, (1)C-28, (2)C-36, (2)C-37, (2)C-40, (1)C-43, (2)C-45, (1)UC-61D, (1)C-70, (1)UC-71, (1)UC-72, (1)UC-81D/E/F, (2)F-2, (1)L-12A, (1)L-20(U-6), (1)O-51, (2)OA-4, (2)OA-9, (2)OA-13, (1)P-21, (1)PT-12, [(1)PQ-11], (1)R-1, (1)R/H-5, (2)R-10, (1)V-3 Navy(1922-1962): (1)GB, (1)GH, (2)HJH, (1)HO2S, (1)HO3S, (2)J3F(JRF), (2)JO, (1)JQ(RQ), (2)JRB(C-45), (2)JRF, (1)NH, (1)OJ, (1)OK, (1)OS2N, (1)OS2U, (2)R2O, (1)RQ, (1)SNB, (1)SNV Joint(1962+): (1)U-6
R-1044	Kinner C-7	Navy(1922-1962): (1)RK
R-1300	Wright/Lycoming	Army/AF(1924-1962): (1)H-19, (1)T-28A, [(1)T-30] Navy(1922-1962): (1)HO4S-3(H-19), (1)HRS-3(H-19), (2)ZPG
R-1340	Pratt & Whitney Wasp	Army/AF(1924-1962): (1)A-4, (1)AT-6/T-6, (2)AT-13, (2)AT-15, (1)AT-16, (1)BC-1, (1)BC-2, (1)BC-3, (1)BT-2, (1)BT-10, (3)C-4, (3)C-5, (2)C-6, (1)C-8, (1)C-12, (1)C-17, (1)C-19, (1)C-23, (1)C-25, (2)C-29, (2)C-35, (2)UC-36B, (1)C-64, (2)C-73, (1)C-85, (1)C-96, (1)C-101, (2)C-106, (1)F-1, (1)R/H-12, (1)H-19A/C, (1)H-43C/D, (1)L-11, (2)LB-3, (1)O-12, (1)O-19, (1)O-22, [(1)O-24], (1)O-28, (1)O-32, [(1)O-37], (1)O-52, [(2)OA-7], (1)P-3, (1)P-12, (1)XP-13A, (1)P-15, (1)P-26, (1)P-27, (1)P-28, (1)P-29 Navy(1922-1962): (1)FA, (1)FB-6/7, (1)F2B, (1)F3B, (1)F4B, (1)F5B, (1)F7B, (1)F6C-4, (1)F7C, (1)F8C, (1)FG, (1)F2G, (1)FH, (1)FJ, (1)F2U, (1)F3W, (1)HOK(H-43), (1)HO4S-1, (1)HRP, (1)HRS-1, (1)HUK(H-43), (1)JA, (1)JE, (1)J2Q(R2Q), (3)JR-3(RR), (1)NJ, (1)OC, (1)O2C, (1)O3C, (1)OL-8/9, (1)O2L, (1)O2N(OSN), (1)O2U, (1)O3U, (1)O4U, (1)O5U, (1)OSN, (1)OSS, (1)OSU, (2)PJ, (2)P3M-1, (2)PS(RS), (2)P2S, (2)PY, (2)RD-3/4, (1)RE, (1)R2Q, (3)RR-3/4/5, (2)RS, (1)SS, (1)SNJ, (1)SOC, (1)SO2C, (1)SON, (1)UC(U-1), (2)ZSG, (2)ZS2G Joint(1962+): (1)U-1
R-1454	Curtiss	Army/AF(1924-1962): (1)O-8, (1)XP-3
R-1510	Wright Whirlwind 14	Navy(1922-1962): (1)F11C-1, (1)F12C, (1)F13C, (1)F2J, (1)F3J, (1)FT, (1)S2C, (1)S4C, (1)SBC-2
R-1535	Pratt & Whitney Twin Wasp Junior	Army/AF(1924-1962): (1)A-17, (1)O-46, [(1)P-32] Navy(1922-1962): (1)BG, (1)B2G, (1)BT, (1)B2Y, (1)BFB, (1)F6B(BFB), (1)FD, (1)F2F, (1)F3F-1, (1)F3U, (1)XO3U-5, (1)XSF-2, (1)SBC-3, (1)SBU, (1)SB2U, (1)SB3U
H-1640 (note 1)	Curtiss Chieftain	Army/AF(1924-1962): [(1)A-6], (1)O-18, (1)O-21, (1)P-11, (1)P-13, [(1)P-14] Navy(1922-1962): (1)XOC-3
R-1670	Wright	Army/AF(1924-1962): (2)A-14, [(1)O-48]
R-1690	Pratt & Whitney Hornet A	Army/AF(1924-1962): (1)A-10, (2)B-3, (2)B-12, (1)C-14B, (2)C-56A/C/D, (2)C-59, (1)C-89, (2)LB-2, [(2)LB-4], (2)LB-7, (2)LB-10, (2)LB-13, (1)O-20, (1)O-38, (2)OA-8, (2)OA-11 Navy(1922-1962): (1)BM, (1)F6C-5, (2)JRS, (1)O3U-2/4(SU), (2)P3M-2, (2)R5O-2, (1)SU, (1)TG-1, (1)XT3M-3, (1)T4M, (1)T5M
R-1750	Wright Cyclone 9	Army/AF(1924-1962): (2)B-5, (1)C-14, (1)C-15, (2)LB-6, (2)LB-9, (2)LB-11, (1)XO-21A, (1)O-29 Navy(1922-1962): (2)PD, (1)XPH-1, (2)PM-1, (2)PN-11/12, (2)P4N, (2)T2D, (1)XT3M-4, (2)TN, (1)T2N
R-1820	Wright Cyclone 9	Army/AF(1924-1962): (1)A-12, (1)A-13, [(2)A-15], (2)A-18, (1)A-24, (1)A-27, (2)A-29, (1)A-33, (2)AT-18, (2)B-6, (2)B-10, [(2)B-11], (4)B-17, (2)B-18, (4)B-40, (1)C-11A, (1)Y1C-14A, (1)C-15A, (1)C-22, (1)C-24, (1)C-27B/C, (2)C-30, (1)C-31, (2)C-32, (2)C-33, (2)C-34, (2)C-38, (2)C-39, (2)C-42, (2)C-49, (2)C-50, (2)C-51, (4)XC-54K, (2)C-56, (2)C-58, (2)C-60, [(2)C-63], (2)C-68, (4)C-75, (2)C-84, (1)C-100, (1)C-103, (4)C-108, (2)C-110, (2)C-111, (2)C-117D, (2)C-122C, (3)C-125, (4)F-9, (1)H-21, (1)H-34, (1)O-29A, (1)O-38D, (1)O-40, (2)O-44, (2)O-45, (1)O-47, (2)OA-5, [(2)OA-6], (1)OA-12, (1)P-20, (1)P-36G, (2)P-50, (1)P-64, (2)SA-16(U-16), (1)T-28 Navy(1922-1962): (1)BT-2, (1)BY, (1)BFC, (1)BF2C, (1)F2A, (1)F8C-7/8, (1)F10C, (1)F11C, (1)FF, (1)F3F-2/3, (1)F4F-5, (1)F5F, (1)FM-2, [(1)F2M], (1)FN, (1)FR, [(1)HRS-4], (1)HSS-1(H-34), (1)HUS(H-34), (1)JF, (1)J2F, (1)JL, (2)JR2F(UF), (1)O2C-2, (4)PB, (2)P2D, (1)PH, (2)PK, (2)PM-2, (3)P2M, (2)P2Y, (2)PBO, (2)R4C, (2)R2D, (2)R3D, (2)R4D-8(C-117), (1)RO, (2)R5O, (1)RT, (1)SC, (1)S3C, (1)SF, (2)S2F(S-2), (1)SBA, (1)SBC-1/4, (1)SBD, (1)SBN, (1)SN2J, (1)SOE, (2)TF(C-1), (1)TG-2, (2)UF(U-16), (2)WF(E-1) Joint(1962+): (2)C-1, (2)E-1, (2)S-2, (2)U-16
R-1830	Pratt & Whitney Twin Wasp	Army/AF(1924-1962): (1)A-16, (1)A-19, (2)A-22, (2)A-28, (1)AT-12, (4)AT-22, (2)B-14, (4)B-15, (4)B-24, (4)B-41, (2)C-41, (2)C-47, (2)C-48, (2)C-52, (2)C-53, (2)C-57, [(2)C-62], (2)C-66, (2)C-76, (4)C-87, [(2)C-93], [(2)C-104], (4)C-105, (4)C-109, (2)C-117, (4)F-7, (2)OA-10, [(1)P-33], [(1)P-34], (1)P-35, (1)P-36, (1)P-41, (1)P-42, (1)P-43, (1)P-66 Navy(1922-1962): (1)F4F, (1)FM-1, (1)JF-1, (4)JR2S, (2)P3D, (2)P3Y, (2)PB2B, (2)PBN, (4)PBS, (2)PBV, (2)PBY, (4)PB2Y, (4)PB4Y(P4Y,P-4), (2)RB, (2)R4D(C-47), (2)R5O-3, (4)RY, (4)R2Y, (1)XT3D-2, (1)TBD, (1)TBG Joint(1962+): (4)P-4
R-1860	Pratt & Whitney Hornet B	Army/AF(1924-1962): (2)B-4, (2)B-9, [(2)B-13], (1)C-11, (1)C-16, (1)C-18, (4)C-20, (1)C-27, (2)LB-8, (2)LB-12, (2)LB-14 Navy(1922-1962): (1)XT3D-1, (1)T6M
R-2000	Pratt & Whitney Twin Wasp	Army/AF(1924-1962): (4)C-54, (2)C-122 Navy(1922-1962): (2)F5U, (4)R5D(C-54) Army(1955-1962): (2)AC-1(CV-2) Joint(1962+): (2)C-7, (2)CV-2(C-7)
R-2160	Wright Tornado	Army/AF(1924-1962): [(1)P-69]
R-2180	Pratt & Whitney Twin Hornet	Army/AF(1924-1962): (2)A-21, [(4)B-20], (2)B-21, (2)H-16, [(1)P-44]
R-2600	Wright Cyclone 14	Army/AF(1924-1962): (2)A-20, (1)A-25, (2)A-30, (1)A-31, [(1)A-34], (1)A-35, (2)AT-24, [(2)B-22], (2)B-23, (2)B-25, [(4)B-33], (2)B-37, (2)C-55, (2)C-67, (4)C-98, (2)F-3, (2)F-10, [(2)O-53], [(2)O-56], [(2)P-65], (2)P-70 Navy(1922-1962): (2)BD, (1)F6F-1, (2)PBJ, (2)PBM, (4)PB2Y-4, (1)SB2A, (1)SB2C, (1)SBF, (1)SBW, (1)TBF, (1)TBM
R-2800	Pratt & Whitney Double Wasp	Army/AF(1924-1962): (1)XA-19B, (2)A-26, (1)A-32, [(2)A-37], [(1)A-39], (2)AT-23, (2)B-26, [(2)B-27], (2)B-28, (2)B-34, (2)C-46, (2)C-82, (4)C-112, (4)C-118, (2)C-123, (2)C-131, (2)F-15, (2)H-37, (1)P-47, (1)P-56, [(2)XP-59(not the jet!)], (1)P-60A/C/E, (2)P-61, (2)T-29, [(2)T-32], [(2)T-36] Navy(1922-1962): (1)AF, (2)AJ(A-2), (1)AU, (1)BTK, (1)F3A, (1)F15C, (1)F6F, (2)F7F, (1)F8F, (1)FG, (1)F3M, (2)F2T, (1)F4U, (2)HR2S(H-37), (1)HSL, (2)JD, (2)JM, (2)PV, (2)PBM-5, [(4)PB3Y], (2)RM(C-3), (2)R5C(C-46), (4)R6D(C-118), (2)R4Y, [(2)TB2F], (1)TB3F, (1)TBU, (1)TBY Joint(1962+): (2)A-2, (2)C-3
R-3350	Wright Cyclone 18	Army/AF(1924-1962): [(2)A-23], (1)A-31C, (2)A-38, [(1)A-40], (4)B-19, (4)B-29, [(4)B-30], [(4)B-31], (4)B-32, (2)B-69, (2)XC-46L, (4)C-69, (4)XC-97, (2)C-119, (4)C-121, (2)C-128, (2)C-134, (4)F-13, (1)P-62 Navy(1922-1962): (1)AD(A-1), (1)BT2C, (1)BTD, (1)BT2D(AD), (1)F14C-2, (4)JRM, (4)P2B, (2)P5M(P-5), (4)PO(WV), (2)P2V(P-2), (2)P4Y, (2)PBB, [(2)PBM-4], (4)PB2M, (4)R7O(R7V), (2)R4Q-2(C-119), [(1)SB3C], (1)SB2D(BTD), (4)R7V(C-121), (4)WV(C-121) Joint(1962+): (1)A-1, (2)P-2, (2)P-5
R-4090	Wright 792C22AA
R-4360	Pratt & Whitney Wasp Major	Army/AF(1924-1962): (1)XA-31B, [(1)A-41], (4)B-35, (6)B-36, (4)B-44, (4)B-50, (4)C-74, (4)C-97, (6)C-99, (2)C-119A/B/C, (2)C-120, (4)C-124, (2)F-11, (4)F-12(R-12), [(2)P-71], (1)P-72 Navy(1922-1962): (1)AM, (1)BTC, (1)BTM(AM), (1)F8B, (2)P4M, (4)R6O(R6V), (2)R4Q-1(C-119), (4)R6V, (1)TB2D
R-7755	Lycoming XR-7755

V-720	Wright	Army/AF(1924-1962): (1)AT-1, [(1)AT-2], (1)AT-3, (1)AT-4, (1)PT-1
V-770	Ranger SGV-770B-3	Army/AF(1924-1962): (2)AT-14, (2)AT-21, (2)BQ-3, (1)O-50, (1)P-77 Navy(1922-1962): (1)F6C-7, (1)OSE, (1)SO3C, (1)SO2U, (1)TE
V-1150	Curtiss D-12	Army(1919-1924): (1)PW-7, (1)PW-8, (1)PW-9, (1)R-6, (1)R-8 Army/AF(1924-1962): (1)A-3, (1)BT-4, (1)O-1, (1)P-1, (1)P-5 Navy(1922-1962): (1)F6C-1/2/3/6, (1)MO, (1)M2O, (1)NO, (1)R2C
V-1400	Curtiss	Army(1919-1924): (1)NO-1 Army/AF(1924-1962): (1)P-2 Navy(1922-1962): (1)R3C
V-1410	Allison-Liberty IV-1410 Liberty	Army(1919-1924): (1)CO-6, (1)XCO-7B Army/AF(1924-1962): (1)A-2
V-1440	Continental
V-1460	Wright IV-1460	Army/AF(1924-1962): (1)O-10, (1)XOA-1A, (1)OA-2, (1)P-17
V-1510	Curtiss
V-1560	Wright IV-1560	Army/AF(1924-1962): [(1)P-18], [(1)P-19]
V-1570	Curtiss Conqueror	Army/AF(1924-1962): [(1)A-5], (1)A-7, (1)A-8, [(1)A-9], (1)A-11, (2)B-1, (2)B-2, (2)B-7, (2)B-8, (2)Y1B-9, (1)O-13, (1)O-16, (1)O-23, (1)O-25, (1)O-26, (2)O-27, [(2)O-30], (1)O-31, (1)O-33, (1)O-34, (2)O-35, (2)O-36, (1)O-39, [(1)O-41], (1)O-43, (1)P-6, (1)P-7, (1)P-9, (1)P-10, (1)P-16(PB-1), (1)P-22, (1)P-23, (1)P-24, (1)P-25, (1)P-30(PB-2), (1)P-31, (1)PB-1, (1)PB-2 Navy(1922-1962): (4)P2H
V-1650	Liberty Liberty 12	Army(1919-1924): (1)A-1, (1)A-2, (1)CO-1, (1)CO-2, (1)CO-3, (1)CO-4, (1)CO-5, (1)CO-7, (1)CO-8, (2)GA-1, (1)IL-1, (6)NBL-1, (2)NBS-1, (2)NBS-2, (2)NBS-3, (2)NBS-4, (2)T-1, (1)T-2, (1)T-3 Army/AF(1924-1962): (1)BT-1, (1)C-1, (2)LB-5, (1)O-1A, (1)O-2, [(1)O-4], (1)O-5, (1)O-6, (1)O-11, (1)OA-1 Navy(1922-1962): (1)O2B, (1)OL-4
V-1650	Packard/Rolls-Royce Merlin	Army/AF(1924-1962): (4)C-115, (1)F-6, (1)P-40F/L, (1)P-51, (1)XP-60/D, [(1)XP-63B], [(1)P-78], (2)P/F-82/B/C/D/E
V-1710	Allison	Army/AF(1924-1962): (1)XA-11A, (1)A-36, (2)A-42, [(6)B-16], (4)B-38, (2)B-42, (4)C-114, (4)C-116, (2)F-4, (2)F-5, (1)F-6A, (2)FM-1, (1)P-37, (2)P-38, (1)P-39, (1)P-40, (1)P-45, (1)P-46, [(1)XP-47/A], (1)P-51/A/J, (1)P-55, (1)XP-60A/B, (1)P-63, [(1)P-76], (2)P/F-82A/F/G/H Navy(1922-1962): (1)FL, (1)FO
V-1950	Wright T-3	Army/AF(1924-1962): [(1)O-3]
V-3420	Allison	Army/AF(1924-1962): (4)B-39, (2)P-58, (1)P-75

Notes:

1. The Curtiss Chieftain engine was of a unique configuration, and was originally classed as a "hexagonal" engine - hence the "H" prefix. It was later redesignated as the R-1640 radial engine.

3 Jet and Turbine Engines, 1946 - 1968

After World War II, the Army and the Navy defined a system for designating gas turbine and other jet engines. The system was formally laid down in Air Force/Navy Aeronautical (ANA) Bulletin 306. This ANA Bulletin was updated several times, the final edition being ANA Bulletin 306M, dated 27 December 1963. On 1 May 1968, a revised system was defined by MIL-STD-879. The latter was finally absorbed into the current standard MIL-HDBK-1812 (originally MIL-STD-1812) on 28 February 1991.

Examples:	Y	T	56	-	A	-	1
		J	35	-	A	-	21	C
	(6)	(1)	(2)		(3)		(4)	(5)

The one- or two-letter code (1) designates the type of the engine:

• J - Turbojet
• T - Turboprop or Turboshaft
• PJ - Pulsejet
• RJ - Ramjet
• TF - Turbofan (added in 1959)

(2) is the model number of the engine. Note that there is no dash between the engine type letter and the model number. The Army and Air Force used odd numbers from 31 up, while the Navy used even numbers from 30 up. Why each numerical sequence was started at 30, I don't know. The numbers were assigned in numerical sequence separately by each service, so the Navy-sponsored J52 was in fact a later engine than the J65, because Navy J-numbers "lagged behind" the Army/AF ones.

(3) is a one- or two-letter code for the manufacturer of the engine. The following is a list of all assigned code letters, not all of which were actually used for jet engines:

• A - Allison Div. (General Motors)
• AC - Allis-Chalmers Manufacturing Co.
• AH - American Helicopter Div. (Fairchild)
• AJ - Aerojet General Corp.
• AM - Aeromarine Co.
• AN - Aeronutronics Corp.
• B - Buick Motor Div. (General Motors)
• BA - Bell Aircraft Corp.
• BL - Bridgeport-Lycoming Div. (AVCO)
• BO - Boeing Co.
• C - Chevrolet Div. (General Motors)
• CW - Curtiss-Wright Propeller Div.
• D - Chrysler Corp.
• DL - De Laval Steam Turbine Co.
• E - Aircooled Motors, Inc. (Franklin)
• EE - Elliot Manufacturing Co.
• F - Ford Motor Co.
• FF - Frederic Flader, Inc.
• G - Warner Aircraft Corp.
• G - Garrett Corp., AiResearch Div.
• GE - General Electric, Gas Turbine Div.
• GN - G.M. Giannini & Co, Inc.
• H - Hiller Helicopters
• HM - Harvey Machine Co., Inc.
• J - Jacobs Aircraft Engine Co.
• JH - Joshua Hendy Iron Works (to "NH" later)
• K - M.W. Kellogg, Inc.
• KA - Kiekhafer-Aeromarine Motors, Inc.
• KF - Kaiser-Frazer Engine Div.
• KM - Kaiser Manufacturing
• L - Lycoming Div. (AVCO)
• LA - Lockheed Aircraft Corp.
• MA - Marquardt Aircraft Co.
• MD - McDonnell Aircraft Corp.
• MH - McCulloch Motors Corp.
• MN - Menasco Manufacturing Co.
• NA - North Amrican Aviation, Inc.
• NH - Northrop Aircraft, Inc. (formerly Hendy)
• NK - Nash-Kelvinator Corp.
• OEL - Orenda Engines (Hawker Siddeley Canada)
• P - Pratt & Whitney
• PM - Packard Motor Car Co. (was "V")
• R - Fairchild Engine Div.
• RM - Reaction Motors, Inc.
• RP - Radioplane Div. (Northrop)
• RR - Rolls-Royce, Ltd.
• S - Solar Aircraft Co.
• ST - Studebaker Corp.
• T - Continental Motors Corp.
• TT - Taylor Turbine (Rolls-Royce agent)
• V - Packard Motor Car Co. (to "PM")
• W - Wright Aeronautical Corp.
• WE - Westinghouse Electric Corp.
• WS - West Engineering Co.

The same code letters were used in serial numbers for all types of engines, including piston and rocket engines. This explains why code letters were also assigned to companies which never developed or manufactured jet or turbine engines.

The number (4) designates a specific model of the engine. The Army and Air Force use odd numbers from 1 up, while the Navy uses even numbers from 2 up.

(5) is an optional letter for designating minor modifications of an engine model. Letters are assigned alphabetically from A on (I and O are not used). The letter W is reserved for engines with water injection, while the combination "WA" is used for engines with water-alcohol injection.

(6) is an optional status prefix:

• X - Experimental
• Y - Service Test
• Z - Obsolete

Designation List:

Designation	Manufacturer and Model	Remarks; Aircraft
J30	Westinghouse 19XB	Army/AF(1924-1962): (2)XP-79B, [(1)XF-92], (2)X-4 Navy(1922-1962): (2)FH
J31	General Electric I-16	Army/AF(1924-1962): (2)P-59 Navy(1922-1962): (1)FR, (1)F2R
J32	Westinghouse 9.5A/B	Navy(1922-1962): (1)KDN
J33	General Electric/Allison I-40	Army/AF(1924-1962): (1)P/F-80, (1)P-81, (2)P-83, (1)XF-92A, (1)F-94A/B, (1)T-33 Navy(1922-1962): (1)AJ(A-2), (1)F9F-3/4, (2)P4M, (1)TO(TV), (1)TV(T-33), (1)T2V(T-1) Joint(1962+): (1)A-2, (1)T-1 Missiles: (1)TM-61(MGM-1), (1)TM-76(CGM-13), (1)SSM-N-8(RGM-6)
J34	Westinghouse 24C	Army/AF(1924-1962): (2)B-69, (1)P/F-85, (4)P/F-87, (2)F-88, (2)F-90, (2)X-3, (1)X-18 Navy(1922-1962): (2)F3D(F-10), (2)F2H(F-2), (1)FR-4, (1)F6U, (2)F7U-1/2, (1)XF2Y-1, (2)P2V-5F/6F/7(P-2), (1)T2J-1(T-2) Joint(1962+): (1)F-2, (2)F-10, (2)P-2E/G/H/J, (1)T-2A Other: (1)Douglas D-558-2
J35	General Electric/Allison TG-180	Army/AF(1924-1962): (2)B-43, (4)XB-45, (4)B-46, (4)B-48, (8)B-49, (2)H-17, (1)P/F-84, (1)XP-86, (2)F-89, (1)F-96, (2)X-5 Navy(1922-1962): (1)FJ-1 Other: (1)Douglas D-558-1
J36	Allis-Chalmers (DeHavilland Goblin)	Navy(1922-1962): (1)F15C
J37	Lockheed L-1000
J38	West Engineering
J39	General Electric I-20	(similar to J31; cancelled)
J40	Westinghouse 40E	Army/AF(1924-1962): (2)X-10 Navy(1922-1962): (2)XA3D-1, (1)XF4D-1, (1)F10F, (1)F3H-1
J41	Packard PT-104/PT-4000	(cancelled project)
J42	Pratt & Whitney (Rolls-Royce Nene)	Navy(1922-1962): (1)F9F-2
J43	Westinghouse	(became XJ30-WE-8)
J44	Fairchild	Army/AF(1924-1962): (2)C-123J, (1)Q-1, (1)Q-3 Navy(1922-1962): (1)KDA-1
J45	Westinghouse	(became XJ34-WE-4)
J46	Westinghouse 24C	Navy(1922-1962): (2)F7U-3, (2)YF2Y-1
J47	General Electric TG-190	Army/AF(1924-1962): (4)B-36D/E/F/H/J, (4)B-45, (6)B-47, (2)KB-50J/K, (3)B-51, (2)KC-97L, (1)F-86, (1)F-91, (1)F-95(F-86D) Navy(1922-1962): (1)FJ-2
J48	Pratt & Whitney JT7	Army/AF(1924-1962): (1)F-93, (1)F-94C, (1)F-97(F-94C) Navy(1922-1962): (1)F9F-5/6/7/8(F-9) Joint(1962+): (1)F-9
J49	Packard PT-205	(cancelled project)
J50	Westinghouse
J51	Wright TJA-1	(cancelled project)
J52	Pratt & Whitney JT8	Navy(1922-1962): (1)A4D(A-4), (2)A2F(A-6) Joint(1962+): (1)A-4, (2)A-6 Missiles: (1)GAM-77(AGM-28)
J53	General Electric	Army/AF(1924-1962): [(4)X-6]
J54	Westinghouse (Rolls-Royce Avon)
J55	Flader 124	Army/AF(1924-1962): [(1)Q-2]
J56	Allison
J57	Pratt & Whitney JT3	Army/AF(1924-1962): (8)B-52, (2)RB-57D, (8)B-60, (4)C-135A, (1)F-100, (2)F-101, (1)F-102, [(2)X-16] Navy(1922-1962): (2)A3D(A-3), (1)F4D(F-6), (1)F5D, (1)F8U(F-8) Joint(1962+): (2)A-3, (1)F-6, (1)F-8, (1)U-2A/B/E Missiles: (1)SM-62
J58	Pratt & Whitney JT11D	Joint(1962+): (2)F-12, (2)SR-71
J59	Wright TJ-7	(cancelled project)
J60	Pratt & Whitney JT12	Army/AF(1924-1962): (2)RB-57F, (4)C-140, (2)T-39, [(2)T-40] Navy(1922-1962): (2)T2J-2(T-2), (2)T3J(T-39) Army(1955-1962): (2)VZ-10(V-4) Joint(1962+): (2)H-59, (2)T-2B, (2)XV-4A
J61	Wright TJ-6	(cancelled project)
J62 up (even)	Most probably not assigned
J63	Fairchild
J65	Wright (Armstrong-Siddeley Sapphire)	Army/AF(1924-1962): (2)B-57, (1)F-84F, (1)XF-104 Navy(1922-1962): (1)A4D-1/2(A-4), (1)FJ-3/4(F-1), (1)F11F(F-11) Joint(1962+): (1)A-4A/B/C/L/P/Q, (1)F-1, (1)F-11
J67	Wright (Bristol Olympus)	Army/AF(1924-1962): [(4)B-59], [(1)F-103]
J69	Continental 352	Army/AF(1924-1962): (1)Q-1A/B, (2)T-37 Navy(1922-1962): (2)TT Army(1955-1962): (3)VZ-9 Joint(1962+): (2)A-37A Missiles: (1)GAM-67, (1)AQM/BQM-34, (1)AQM-103
J71	Allison	Army/AF(1924-1962): [(4)B-56], (2)B-66, (2)YF-89E Navy(1922-1962): (1)F3H(F-3), (4)P6M-1 Joint(1962+): (1)F-3
J73	General Electric	Army/AF(1924-1962): (1)F-86H Navy(1922-1962): [(1)F3H-3]
J75	Pratt & Whitney JT4	Army/AF(1924-1962): (1)F-105, (1)F-106, (1)F-107 Navy(1922-1962): (1)F8U-3, [(2)F2Y-2], (4)P6M-2 Joint(1962+): (1)TR-1, (1)U-2C/D/F/G/H/R
J77	General Electric
J79	General Electric X-24A	Army/AF(1924-1962): (4)B-58, (1)F-104, (2)F-110(F-4), (2)X-21 Navy(1922-1962): (2)A3J(A-5), (2)F4H(F-4), (1)F11F-1F Joint(1962+): (2)A-5, (2)F-4, (1)F-21 Missiles: (1)SSM-N-9(RGM-15)
J81	Westinghouse (Rolls-Royce Soar)	Army/AF(1924-1962): (1)Q-4(AQM-35) Missiles: (1)AQM-35
J83	Fairchild	Missiles: (1)SM-73
J85	General Electric CJ610	Army/AF(1924-1962): (2)C-119K, (2)C-123K, (1)Q-4B(AQM-35B), (2)T-38, (2)X-14 Army(1955-1962): (2)VZ-11(V-5) Joint(1962+): (2)A-37B, (2)F-5, (2)T-2C/D/E, (6)XV-4B, (2)V-5 Missiles: (1)GAM-72(ADM-20), (1)AQM-35B, (1)MQM-34D Other: (2)Lockheed "HAVE BLUE"
J87	General Electric X-211	(nuclear powered engine; cancelled)
J89	Allison	(low-bypass turbofan engine; unsuccessful competitor to J93 for use in B-70)
J91	Pratt & Whitney JTN9	(higher-bypass turbofan engine; unsuccessful competitor to J93 for use in B-70; also considered as a nuclear engine)
J93	General Electric 7E	Army/AF(1924-1962): (6)B-70, [(2)F-108]
LJ95 (note 1)	Teledyne CAE 365
J97	General Electric GE1	Missiles: (1)AQM-91, (1)GQM-94
J99	Rolls-Royce	Other: Grumman 754 RPV

T30	Westinghouse
T31	General Electric TG-100	Army/AF(1924-1962): (2)C-113, (1)P-81 Navy(1922-1962): (1)F2R
T32	Pratt & Whitney
T33	Flader Brigadier	(cancelled project)
T34	Pratt & Whitney PT2	Army/AF(1924-1962): (4)YC-97J, (4)YC-121F, (4)YC-124B, (4)C-133 Navy(1922-1962): (4)R7V-2(C-121)
T35	Wright	(cancelled project)
T36	Chrysler
T37	Northrop Turbodyne	Army/AF(1924-1962): [(4)EB-35B]
T38	Allison 501F-1	Army/AF(1924-1962): (1)F-88B, (2)H-27(YH-16A), [(2)T-29E]
T39	Allison 504	(cancelled project)
T40	Allison 500	Army/AF(1924-1962): (1)XF-84H, (2)X-18 Navy(1922-1962): (1)A2D, (2)A2J, (1)FV, (1)FY, [(2)P3B], (4)P5Y, (4)R3Y
T41	General Electric TG-110	(derivative of T31; project cancelled)
T42	De Laval
T43	Wright GTC-1	(cancelled project)
T44	Allison 503	(cancelled project; similar to T40, but with 3 instead of 2 power sections)
T45	Pratt & Whitney PT4	(cancelled project)
T46	Fairchild
T47	Wright
T48	Pratt & Whitney
T49	Wright TP51A2	Army/AF(1924-1962): (2)XB-47D
T50	Boeing 502-2E	Army/AF(1924-1962): (1)XL-19B, (1)QH-50
T51	Continental 220	Army/AF(1924-1962): (1)XH-13F, (1)H-39, (1)XL-19C
T52	Pratt & Whitney
T53	Lycoming LTC1	Army/AF(1924-1962): (1)H-40, (1)H-43 Navy(1922-1962): (2)OF(OV-1) Army(1955-1962): (1)VZ-2, (1)VZ-3 (1)VZ-4 Joint(1962+): (1)H-1, (2)OV-1
T54	Allison	(Twin T56) Navy(1922-1962): [(1)XFV-2]
T55	Lycoming LTC4/AL55	Army/AF(1924-1962): (1)YAT-28E, (2)H-47, (2)X-19
T56	Allison 501D	Army/AF(1924-1962): (4)C-130, (2)C-131C/H, (2)YH-16B Navy(1922-1962): [(2)HRH], (2)W2F(E-2), (4)P3V(P-3) Joint(1962+): (2)C-2, (2)E-2, (4)P-3
T57	Pratt & Whitney PT5	Army/AF(1924-1962): [(4)C-132]
T58	General Electric CT58	Army/AF(1924-1962): (2)H-21D, (2)SH-34H, (2)H-46, (1)H-48 Navy(1922-1962): (2)HRB(H-46), (2)HSS-2(H-3), (1)HU2K(H-2), (1)HU2S(H-52) Army(1955-1962): (1)VZ-5 Joint(1962+): (1)UH-1F/P, (1)UH-2A/B, (2)H-2, (2)H-3, (1)H-52, (4)X-22
(T59)	(No information)
T60	Boeing
T61	Allison
T62	Solar Mercury
T63	Allison 250	Army/AF(1924-1962): (1)UH-13R Navy(1922-1962): (1)HUL-1M Joint(1962+): (1)H-4, (1)H-6, (1)H-57, (1)H-58, (1)H-67, (1)V-11
T64	General Electric	Army/AF(1924-1962): (4)C-142 Joint(1962+): (2)C-27, (2)H-53, (3)H-53E, (1)H-56, (2)V-9
T65	Continental TS325-1
T66	Solar
T67	Continental 217A-2A
T68	Rolls-Royce
T69	Continental
T70	Westinghouse
T71	Allison
T72	Continental
T73	Pratt & Whitney JFTD12	Joint(1962+): (2)H-54
T74	Pratt & Whitney PT6	Joint(1962+): (2)U-21E/G (see note 2)
T75 up (odd)	Most probably not assigned
T76	Garrett-AiResearch TPE331	Joint(1962+): (2)C-26, (1)U-23, (2)OV-10
T78	Allison 545	(development only, not flown)
T80	Allison	(cancelled project)

(PJ30)	(No information)
PJ31	Ford	Army(1924-1962): (1)JB-2(LTV-A-1), (1)JB-4, (1)JB-10 Navy(1922-1962): (1)KGW(KUW,LTV-N-2) Missiles: (1)LTV-A-1, (1)LTV-N-2
PJ32	Solar	Navy(1922-1962): (1)KD2G
PJ33	Giannini
(PJ34)	(No information)
PJ35	Giannini
(PJ36)	(No information)
PJ37	Giannini
(PJ38)	(No information)
PJ39	Giannini	Army/AF(1924-1962): (1)XQ-1
PJ40	Marquardt
(PJ41)	(No information)
PJ42	McDonnell
(PJ43)	(No information)
(PJ44)	(No information)
(PJ45)	(No information)
PJ46	Marquardt	Navy(1922-1962): (1)KD5G
(PJ47)	(No information)
(PJ48)	(No information)
PJ49	American Helicopter	Army/AF(1924-1962): (2)H-26

RJ30	Marquardt C-20	Navy(1922-1962): (1)KDM
RJ31	Marquardt C-30
(RJ32)	(No information)
(RJ33)	(No information)
RJ34	Marquardt
RJ35	Continental	(cancelled project)
(RJ36)	(No information)
RJ37	Menasco A-J-20	(cancelled project)
(RJ38)	(No information)
RJ39	Marquardt C-48
RJ40	Pratt & Whitney
RJ41	Wright
RJ42 up (even)	Most probably not assigned
RJ43	Marquardt	Army/AF(1924-1962): (1)X-7 Missiles: (1)IM-99 Other: (1)Lockheed D-21
RJ45	Continental R-20	(cancelled project)
RJ47	Wright	Army/AF(1924-1962): (1)X-7 Missiles: (2)SM-64(Sustainer)
RJ49	Continental	(cancelled project)
RJ51	Wright
(RJ53)	(No information)
RJ55	Wright	Army/AF(1924-1962): [(1)F-103]
RJ57	Marquardt
RJ59	Marquardt	Other: [(2)Convair "Kingfish"]

TF30	Pratt & Whitney JTF10A	Army/AF(1924-1962): (2)F-111 Navy(1922-1962): [(2)F6D] Joint(1962+): (1)A-7, (2)F-14, [(1)X-27]
TF31	General Electric X-84	(proposed for OXCART (Lockheed A-12); cancelled)
TF32	Allison	(competitor to TF34; cancelled)
TF33	Pratt & Whitney JT3D	Army/AF(1924-1962): (8)B-52H, (2)RB-57F, (4)C-135, (4)C-137, (4)C-141 Joint(1962+): (4)C-18, (4)C-24, (4)E-3, (4)E-8
TF34	General Electric CF34	Joint(1962+): (2)A-10, (2)S-3 Missiles: [(1)GQM-94B]
TF35	General Electric	(derivative of Model CJ 805-23)
TF36 up (even)	Most probably not assigned
TF37	General Electric CF700
TF39	General Electric CTF39	Joint(1962+): (4)C-5
TF41	Allison	Joint(1962+): (1)A-7D/E/H/K

Notes:

1. "LJ" probably means "Lift Jet". I don't know for sure, whether the LJ95 really fits into the J-sequence, but considering the high number (making a separate LJ-series unlikely) and the fact, that J95 would be missing otherwise, I risk a guess.

2. It seems, that only the basic PT6 engine is designated as T74. Many aircraft use the PT6A version, which is always (exception: T101 for C-23, see below) listed as such in official military documents and data sheets. Aircraft using the PT6A are:
Army/AF(1924-1962): (1)T-34C
Joint(1962+): (2)C-6, (4)RC-7B, (2)C-12, (4)O-5, (1)T-6, (2)T-44, (2)U-21, (1)U-24, (1)U-27, (2)V-18, (1)V-20
Missiles: (1)GQM-93

4 Rocket Engines

4.1 Liquid Fuel Rockets

The designation system for liquid fueled rockets was originally devised in the 1940's and formally defined in Air Force/Navy Aeronautical (ANA) Bulletin 352 (25 June 1948), later included in MIL-STD-815 (USAF only, 14 June 1962) and finally absorbed into the current standard MIL-HDBK-1812 (originally MIL-STD-1812, 28 February 1991). The system (the familiar "LR" designations) has gone through all this essentially unchanged and is discussed in section 5.2 about current rockets. The only difference in the original 1948 system was, that odd model numbers were reserved for the Air Force and Army, while the Navy used only even model numbers. This is similar to early jet engine designations, except that for liquid rockets, the sequence started at 1 instead of 30.

4.2 Solid Fuel Rockets

The original designation system for solid rockets was completely different from today's system and was defined in Air Force/Navy Aeronautical (ANA) Bulletin 353 (22 July 1948). This designation system was abandoned in the 1960's. The Air Force created a new scheme, very similar to that for liquid rockets, and included it in MIL-STD-815 (14 June 1962). The latter system was finally absorbed into the current standard MIL-HDBK-1812 (originally MIL-STD-1812) and is discussed in section 5.2 about current rockets. After abandoning ANA Bulletin 353, the Navy used its MARK/MOD nomenclature system, while the Army used its Ordnance Number nomenclature.

The original (ANA Bulletin 353) designations for solid rocket motors looked like this:

Example:	1.8	KS	7800
	(1)	(2)	(3)

The number (1) is the burn time of the motor in seconds.

The two-letter code (2) indicates the type of propellant. The type codes were assigned by the Solid Propellant Information Agency (SPIA).

First letter:

• A - Asphalt Perchlorate
• B - Ball or Chopped Double Base Powder
• C - Picrate Nitrate Types
• D - Cast Double Base
• E - Extruded Double Base
• K - Other Perchlorate with Nitrogen Compounds (e.g. Ammonium Perchlorate NH₄ClO₄)
• N - Other Nitrates and Nitrogen Compounds
  Second letter:
• P - Plastic Composition
• S - Solid Composition

Number (3) is the thrust of the motor in pounds.

Note: There are no dashes and blanks between the three elements of the designation.

5 The Current System (MIL-HDBK-1812)

On 28 February 1991, MIL-STD-1812 became formally effective. This standard combined several equipment designation systems, which shared common definitions and procedures, into a single document. Included were the type designation systems for all aerospace engines. On 14 February 1997, MIL-STD-1812 was renamed as MIL-HDBK-1812. The change from "Standard" to "Handbook" means, that the use of the designation systems is no longer mandatory. This finally "legalizes" the long standing practice of using manufacturers' designations for commercial equipment procured "off the shelf". Otherwise, MIL-HDBK-1812 is identical to MIL-STD-1812.

5.1 Air-Breathing Engines

For turbine engines, the MIL-STD-879 system (now absorbed by MIL-STD-1812) has not changed a lot from the previous system defined in ANA Bulletin 306. The engine type designators and model numbering methods were just revised a little bit. Piston engines, however, are no longer supposed to use the displacement-based designations, but this seems to be a purely theoretical change, because no new piston engines are developed specifically for the military market and new commercial piston engines are operated with their manufacturers' designations. The latter is probably done, because the major American manufacturers of modern piston engines give their engines designations closely following the original "arrangement-displacement" system.

Examples:	Y	F	119	-	PW	-	100
		T	700	-	GE	-	701	C
	(6)	(1)	(2)		(3)		(4)	(5)

The letter (1) designates the type of the engine:

• J - Turbojet
• T - Turboprop or Turboshaft
• F - Turbofan
• O - Piston, Opposed
• R - Piston, Radial
• V - Piston, Vee
• C - Rotating Combustion
• P - Other

I don't know any engine designated in this system with an "O", "R", "V", "C" or "P" designation.

(2) is the model number of the engine. Note that there is no dash between the engine type letter and the model number. The Air Force uses model numbers 100 to 399, the Navy uses 400 to 699 and the Army uses 700 to 999. The numbers are assigned in numerical sequence separately by each service.
The T800 designation for the engine of the Army's RAH-66 Comanche is therefore not strictly conforming to the system, because the Army apparently started a new sequence at 800. Instead, it should have been designated T704 (or whatever the next available number was). But - as I said in the initial paragraph of this chapter - such deviations are actually allowed nowadays.

(3) is a two-letter code for the manufacturer of the engine. A few three-letter codes are assigned to non-US manufacturers or joint-venture companies. The following is a list of all assigned code letters (the same letters are used for rocket engine designations):

• AB - Allegany Ballistics Lab.
• AC - AMOCO Chemicals Corp.
• AD - Allison Div. (General Motors)
• AE - Aerodyne Corp. (formerly AD)
• AI - Astropower, Inc.
• AJ - Aerojet General Corp.
• AN - Aeronutronics Corp.
• AR - Atlantic Research Corp.
• AS - Astrosystems, Inc.
• BA - Bell Aerosystems Co.
• BG - B.F. Goodrich Co. (formerly G)
• CA - Continental Aviation And Engineering Corp.
• CF - CFM International
• CP - United Aircraft of Canada Ltd.
• CW - Curtiss-Wright Corp.
• GA - AiResearch Div. (Garrett Corp.)
• GE - General Electric Co.
• IHI - Ishikawajima Heavy Industries Co., Ltd., Japan
• HP - Hercules Powder Co.
• HT - Hughes Tool Co.
• LHT - Light Helicopter Turbine Engine Co. (LHTEC)
• LD - Lycoming Div. (AVCO)
• LP - Lockheed Propulsion Co.
• MA - Marquardt Corp.
• MAN - Maschinenfabrik Augsburg-Nürnberg, Germany
• MT - Microturbo
• MTU - Motoren- und Turbinen-Union (DaimlerChrysler), Germany
• NA - North American Rockwell Corp. (Rocketdyne)
• NC - Northrop Carolina Corp.
• NM - Naval Missile center
• NP - Naval Propellant Plant No. 5
• NW - Naval Weapons center
• OM - Olin Mathieson Co.
• PA - Picatinny Arsenal
• PW - Pratt & Whitney
• RC - Rocket Research Corp. (formerly RR)
• RD - Rocketdyne (now Rockwell/Hercules)
• RM - Reaction Motors Div. (Thiokol)
• RP - Rocket Power, Inc.
• RR - Rolls Royce Ltd.
• SP - Sunstrand Power Systems
• TC - Thiokol Chemical Corp.
• TR - TRW Systems
• UT - United Technology Center
• WA - Curtiss-Wright Corp. (cancelled, use CW)
• WR - Williams Research Corp.
• WV - United Aircraft of West Virginia
• ZZ - any contractor not listed (also used, if contractor is not yet determined)

Of course, new letters may be assigned, when companies change names, merge or found special joint-venture companies.

The number (4) designates a specific model of the engine. The same method for assignment as for the basic model numbers applies: The Air Force uses numbers 100 to 399, the Navy uses 400 to 699 and the Army uses 700 to 999. It is possible, that an Air Force engine, when used by the Navy, gets a Navy model number, e.g. F110-GE-400.
If a new model of an engine designated within the "old" numerical sequence is procured, model suffixes from the "new" system may be assigned. This results in designations like T64-GE-416A. For the first such assigment, usually the next available number in the "old" model series is taken and added to the "base block number" of the relevant service, e.g. T55-L-11 was followed by T55-L-712.

(5) is an optional letter for designating minor modifications of an engine model. Letters are assigned alphabetically from A on (I and O are not used). The letter W is reserved for engines with water injection.

(6) is an optional status prefix:

• X - Experimental
• Y - Service Test

Designation List:

Designation	Manufacturer and Model	Remarks; Aircraft
J100	Teledyne CAE	Missiles: (1)AQM-34P/Q/R
J101	General Electric GE15	Joint(1962+): (2)F-17
J102	Allison	(supersonic missile engine)
J400	Williams WR24	Joint(1962+): (3)X-48 Missiles: (1)BQM/MQM-74, (1)AGM-154D/E
J401	Garrett AiResearch
J402	Teledyne CAE 370/372/373	Missiles: (1)AGM-84, (1)MQM-107, (1)BQM-108, (1)AGM/RGM/UGM-109, (1)AGM-158, (1)AGM-159
J403	Microturbo TRI 60-3	Missiles: (1)BQM-126
J700	Teledyne CAE 312	Missiles: (1)ADM-141B/C

T100	Sunstrand
T101	Pratt & Whitney PT6A-45A	Joint(1962+): (2)C-23
T400	Pratt & Whitney PT6T	Joint(1962+): (1)AH-1J/T, (1)UH-1N/Y, (1)H-59
(T401)	(No information)
(T402)	(No information)
(T403)	(No information)
(T404)	(No information)
T405	Avco Lycoming PLT27	(derivative of AGT-1500 engine of XM1 tank; evaluated for LAMPS III competition)
T406	Allison AE1107	Joint(1962+): (2)V-22
T407	General Electric GE38	Joint(1962+): [(4)P-7]
T408	General Electric	(evaluated for LAMPS III competition)
T700	General Electric GE12	Joint(1962+): (2)AH-1W/Z, (2)SH-2G, (2)H-60, (2)H-61, (2)H-63, (2)H-64
T701	Allison 501-M62	Joint(1962+): [(3)H-62]
T702	Avco Lycoming LTS101	Joint(1962+): (2)H-65
T703	Allison 250	(improved T63) Joint(1962+): (1)OH-58D
(T704)	(No information)
(T705)	(No information)
(T706)	(No information)
(T707)	(No information)
T708	General Electric
T800	LHTEC	Joint(1962+): (2)H-66

F100	Pratt & Whitney JTF22	Joint(1962+): (1)YA-7F, (2)F-15, (1)F-16
F101	General Electric	Joint(1962+): (4)B-1
F102	Avco Lycoming ALF502	Joint(1962+): (2)A-9, (4)XC-8A
F103	General Electric CF6	Joint(1962+): (3)C-10, (2)C-14, (4)C-25, (4)E-4
F104	Garrett ATF3	Joint(1962+): (2)U-25 Missiles: (1)GQM-98
F105	Pratt & Whitney JT9D	Joint(1962+): (4)E-4A
F106	Teledyne(?)
F107	Williams	Missiles: (1)AGM-86, (1)BGM-109
F108	CFM CFM56	Army/AF(1924-1962): (4)KC-135R/T Joint(1962+): (2)C-40, (4)E-3F, (4)E-6
F109	Garrett TFE76	Joint(1962+): (2)T-46, [(2)T-48]
F110	General Electric	Joint(1962+): (2)F-14B/D, (1)F-16C/D
(F111)	(No information)
F112	Williams	Joint(1962+): (1)X-36, (1)X-50 Missiles: (1)AGM-129
F113	Rolls-Royce Mk.511 Spey	Joint(1962+): (2)C-20
(F114)	(No information)
(F115)	(No information)
(F116)	(No information)
F117	Pratt & Whitney PW2037	Joint(1962+): (4)C-17
F118	General Electric	Joint(1962+): (4)B-2, (1)U-2S
F119	Pratt & Whitney PW5000	Joint(1962+): (2)F-22, (2)YF-23A
F120	General Electric GE37	Joint(1962+): (2)YF-22A, (2)YF-23A
F121	Williams	Missiles: (1)AGM-136
F122	Williams	Missiles: (1)AGM-137
(F123)	(No information)
F124	Garrett TFE1042, TFE1088-16	Joint(1962+): (1)X-45A Czech Rep.: (1)Aero L-159
F125	Garrett TFE1042-70	(no US aircraft) Taiwan: (2)AIDC Ching Kuo
F126	Rolls-Royce Mk.611/661 Tay	Joint(1962+): (2)C-20F/G/H
F127	General Electric	(derivative of J101/F404 for export; cancelled)
F128	General Electric	(derivative of J101/F404 for export; afterburning version of F127; cancelled)
F129	Williams FJ44	Joint(1962+): (1)Q-3
(F130)	(No information; probably not assigned)
(F131)	(No information; probably not assigned)
(F132)	(No information; probably not assigned)
(F133)	(No information; probably not assigned)
(F134)	(No information; probably not assigned)
F135	Pratt & Whitney	Joint(1962+): (1)F-35, (1)X-32, (1)X-35
F136	General Electric	Joint(1962+): (1)F-35
F137	Rolls-Royce/Allison AE3007H	Joint(1962+): (1)Q-4
F400	General Electric
F401	Pratt & Whitney	Joint(1962+): (2)YF-14B, (1)FV-12
F402	Rolls-Royce Pegasus	Joint(1962+): (1)AV-8
(F403)	(No information)
F404	General Electric	Joint(1962+): (2)A-6F, (2)F-18, (1)F-20, (2)F-117, (1)X-29, (1)X-31, (1)X-45B
F405	Rolls-Royce/Turbomeca Adour	Joint(1962+): (1)T-45
(F406)	(No information)
(F407)	(No information)
F408	Teledyne CAE 382	Missiles: (1)BQM-145
(F409)	(No information)
(F410)	(No information)
(F411)	(No information)
F412	General Electric	(improved F404) Joint(1962+): [(2)A-12]
(F413)	(No information)
F414	General Electric	(improved F412) Joint(1962+): (2)F-18E/F
F415	Williams	Missiles: (1)RGM/UGM-109E/H
F700	General Electric

5.2 Rocket Engines

Rocket engines are assigned designations similar to air-breathing engines, except that the model numbering does not indicate the developing service any more. In fact, only the Air Force seems to use the LR/SR rocket designators nowadays. Navy rocket engines and motors are usually designated in the Navy's MARK/MOD numbering system, while the Army uses its Ordnance Number nomenclature.

Examples:	X	LR	99	-	RM	-	1
		SR	110	-	AD	-	1
	(6)	(1)	(2)		(3)		(4)	(5)

The letter (1) designates the type of the engine:

• LR - Liquid Fuel Rocket Engine
• SR - Solid Fuel Rocket Motor
• LSR - Liquid/Solid Hybrid Rocket

(2) is the model number of the engine. Note that there is no dash between the engine type letter and the model number. Each rocket type uses a separate numerical sequence, starting from 1. The original method to assign odd numbers to Air Force engines and even numbers to Navy engines has been discarded.

(3) is a two-letter code for the manufacturer of the engine. The listing of currently defined manufacturer codes can be found in the section about air-breathing engines.

The number (4) designates a specific model of the engine. Numbers are assigned in numerical sequence, starting from 1.

(5) is an optional letter for designating minor modifications of an engine model. Letters are assigned alphabetically from A on (I and O are not used).

(6) is an optional status prefix:

• X - Experimental
• Y - Service Test

Designation List:

Unfortunately, my list of rocket engine designations is still very incomplete. I don't know any actual designations in the "LSR" series, and the SR list has numerous gaps. Therefore, I have omitted the usual "(No information)" entries for the gaps in the latter, and have listed only designations known to me.
Because very few manned aircraft used rocket propulsion, I have ommitted the "Missiles:" designation system prefix for all missiles listed in the "Aircraft" column.

Designation	Manufacturer and Model	Remarks; Aircraft
LR1	Aerojet 25-AL-1000	(RATO rocket for A-20)
LR2	Reaction Motors
LR3	Aerojet 25-ALD-1000	(Droppable RATO rocket for B-25J)
(LR4)	(No information)
LR5	Aerojet X40-ALD-3000	(Droppable RATO rocket)
LR6	Reaction Motors	(1)SAM-N-2, (1)CTV-N-9
LR7	Aerojet XCALT-6000
LR8	Reaction Motors	Army/AF(1924-1962): (1)X-1E Other: (1)Douglas D-558-2
LR9	Aerojet X4-AL-1000	(Brake rocket for G-4A)
LR10	Reaction Motors	(1)RTV-N-12
LR11	Reaction Motors	Army/AF(1924-1962): (1)F-91, [(1)XF-92], (1)X-1 Joint(1962+): (1)X-24
(LR12)	(No information)
LR13	Aerojet X60-ALD-4000	(RATO rocket for B-29, B-45)
(LR14)	(No information)
LR15	Aerojet XCNLT-1500
LR16	Aerojet
LR17	Curtiss-Wright	(RATO rocket for XB-45)
(LR18)	(No information)
LR19	Curtiss-Wright
LR20	Aerojet	(1)SAM-N-2/4
LR21	Curtiss-Wright	(cancelled project)
LR22	Reaction Motors
LR23	Aerojet X90-ALT-60000
LR24	Aerojet	(1)SAM-N-2/4
LR25	Curtiss-Wright	Army/AF(1924-1962): (1)X-2
LR26	Reaction Motors
LR27	Curtiss-Wright	(planned for XF-91; cancelled)
(LR28)	(No information)
LR29	Curtiss-Wright	(cancelled project)
LR30	Reaction Motors	(planned for X-15; cancelled)
LR31	M.W. Kellogg	(cancelled project)
LR32	Reaction Motors	Army/AF(1924-1962): XH-15(blade-tip engine)
LR33	Reaction Motors	(cancelled project)
LR34	Reaction Motors	(helicopter blade-tip engine)
LR35	Reaction Motors	(1)RTV-A-2
(LR36)	(No information)
LR37	Curtiss-Wright
(LR38)	(No information)
LR39	Reaction Motors
LR40	Reaction Motors	Navy(1922-1962): [(1)F8U-3F]
LR41	North American
LR42	North American	Navy(1922-1962): (1)FJ-4F
LR43	North American	Army/AF(1924-1962): [(1)X-11], [(3)X-12]
LR44	Thiokol TD-174	(1)AAM-N-6, (1)GAM-79
LR45	Aerojet AJ24-1	(RATO rocket; planned for F-84 and cancelled B-47C(B-56))
LR46	North American	(derivative of LR42 planned for A3J)
LR47	M.W. Kellogg SPD 649-1	(RATO rocket; planned for cancelled B-47C(B-56))
LR48	Reaction Motors
LR49	Aerojet	(RATO rocket)
LR50	General Electric X-405	(1)Vanguard(1st stage)
LR51	Aerojet
LR52	Aerojet AJ-10	(1)Vanguard(2nd stage)
LR53	Aerojet	(Booster rocket planned for F-80)
LR54	North American	(derivative of LR42) Navy(1922-1962): [(1)F8U-1F]
LR55	North American	(2.75" rocket)
LR56	Aerojet	Navy(1922-1962): [(1)F8U-3F]
(LR57)	(No information)
LR58	Thiokol TD-187	(1)AGM-12B, (1)AGM-83
LR59	Aerojet	(1)IM-99
(LR60)	(No information)
(LR61)	(No information)
LR62	Thiokol TD-232	(1)AGM-12C/E
LR63	Aerojet	(RATO/Booster rocket planned for F-84 and F-86)
LR64	Rocketdyne	(1)AQM-37
LR65	Bell	Army/AF(1924-1962): (1)X-9
LR66 ... LR130 (even)	Most probably not assigned
LR67	Bell	(1)GAM-63
(LR69)	(No information)
LR71	North American	(1)XSM-64(Booster)
LR73	Aerojet
LR75	M.W. Kellogg	(RATO rocket; derivative of LR47)
(LR77)	(No information)
LR79	Rocketdyne S-3D	(1)SM-75(PGM-17), (1)SM-78(PGM-19)
LR81	Bell	(1)RM-81
LR83	North American	[(1)XSM-64A(Booster)]
LR85	?	(1)GAM-71
LR87	Aerojet	(2)SM-68(LGM-25)(1st stage)
LR89	Rocketdyne	(2)SM-65(CGM-16)(Booster)
LR91	Aerojet	(1)SM-68(LGM-25)(2nd stage)
(LR93)	(No information)
(LR95)	(No information)
(LR97)	(No information)
LR99	Reaction Motors	Army/AF(1924-1962): (1)X-15
LR101	Rocketdyne	(2)SM-65(CGM-16)(Vernier), SM-75(PGM-17)(Vernier)
(LR103)	(No information)
LR105	Rocketdyne	(1)SM-65(CGM-16)
LR107	Hughes Tool Co.
(LR109)	(No information)
(LR111)	(No information)
LR113	Aerojet
LR115	Pratt & Whitney RL-10-A-1	(2)SSB-8
(LR117)	(No information)
LR119	Pratt & Whitney RL-10-A-3	(planned for Saturn; cancelled)
LR121	Rocketdyne	Army/AF(1924-1962): (1)NF-104A
(LR123)	(No information)
(LR125)	(No information)
(LR127)	(No information)
LR129	Pratt & Whitney	(engine developed for boost/glide aerospace craft; later modified into unsuccessful competitor for Space Shuttle main engine)
LR132	Rocketdyne RS-47	("Orbital Transfer Engine")

SR9	Hercules Powder
SR11	Hercules Powder	LGM-30(Retro Motor)
SR13	Lockheed
SR19	Aerojet	(1)LGM-30F/G(2nd stage)
SR45	Atlantic Research	(1)PWN-6, (1)PWN-7
SR47	United Technology Center	Titan III(Zero Stage)
SR49	Thiokol TU-289	(1)AIR-2
SR51	Thiokol	LGM-25C(Retro Motor)
SR55	United Technology Center	LGM-25C(Staging Motor)
SR59	Atlantic Research	LGM-30(Pitch Motor)
SR61	Atlantic Research	LGM-30(Spin Motor)
SR71	Aerodyne	(1)PWN-8
SR73	Aerojet/Thiokol	(1)LGM-30G(3rd stage)
SR75	Lockheed	(1)AGM-69, (1)ASM-135
SR105	Aerojet	(1)2.75" Improved FFAR
SR109	Thiokol TX-481	(1)AGM-65
SR110	Aerodyne	(1)PWN-10, (1)PWN-11, (1)PWN-12
SR113	Thiokol	(1)AGM-88
SR114	Thiokol TX-633	(1)AGM-65
SR115	Aerojet	(1)AGM-65
SR116	Aerojet	(1)AIM-9J/P
SR118	Thiokol	(1)LGM-118(1st stage)
SR119	Aerojet	(1)LGM-118(2nd stage)
SR120	Hercules	(1)LGM-118(3rd stage)
SR121	Naval Propellant Plant	MQM-107(Booster)
SR122	Rocketdyne	(also designated WPU-9/B) (1)AGM-130

6 Sources

In no particular order:

[1] James C. Fahey: "The Ships and Aircraft of the US Fleet", 6th, 7th and 8th ed., U.S. Naval Institute, 1955, 1958, 1965
[2] James C. Fahey: "United States Air Force and United States Army Aircraft 1947-1956"
[3] James C. Fahey: "United States Army Aircraft 1908-1946"
[4] Department of Defense: MIL-HDBK-1812 "Type Designation, Assignment And Method For Obtaining"
[5] Gordon Swanborough, Peter M. Bowers: "United States Military Aircraft since 1908", Putnam, 1989
[6] Gordon Swanborough, Peter M. Bowers: "United States Naval Aircraft Since 1911", Putnam
[7] Bill Gunston: "World Encyclopedia Of Aero Engines"
[8] John M. Andrade: "U.S. Military Aircraft Designations and Serials 1909-1979", Midland, 1979
[9] Norman J. Bowman: "The Handbook of Rockets and Guided Missiles", Perastadion Press, 1963
[10] USAF Air Materiel Command: "Model Designations of U.S.A.F Aircraft Engines, Revised January 1, 1950"
[11] Air Force-Navy Aeronautical (ANA) Bulletin 306M: "Engines, Aircraft Turbine and Jet, Designation Of"

Comments and corrections to: Andreas Parsch

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Last Updated: 13 May 2005