Aer-pp-42 

NAVY DEPARTMENT
BUREAU OF AERONAUTICS
WASHINGTON 25, D.C.

CONFIDENTIAL

27 May 1948

AVIATION CIRCULAR LETTER NO. 61-48

From: Chief, Bureau of Aeronautics

To: All Ships, Stations, and Units Concerned with Naval Aircraft

Subject: Navy Aircraft Engines - Air Force-Navy Model Designations for.

Reference: (a) ACL No. 86-47 dtd 12 Sep 1947.

1. Newly established Air Force-Navy designations have been assigned to naval aircraft engines as follows;

(a) Reciprocating and Compound Engines

Air Force-Navy Designation

Manufacturer's Designation

Description

Use

R-4360-24

Pratt & Whitney Wasp Major

Similar to R-4360-4 but with .375:1 propeller reduction gear ratio. (Restricted security classification)

JRM-2

R-3350-30

Wright Turbo-Cyclone C18C11

A 3250 H.P. compound engine comprising an R-3350 engine with three exhaust driven blowdown turbines coupled to the crankshaft through fluid couplings .(Restricted security classification)

P2V-4

(b) Turbo-Jet Engines

J33-A-10

Allison J33-C5

Similar to J33-A-23 but without liquid injection system. (Restricted security classification)

AJ-1
P4M-1

J34-WE-30

Westinghouse 24C-4C

Similar to J34-WE-22 engine but with higher thrust ratings. (Restricted security classification)

F6U-1
F2H-1

XJ34-WE-32

Westinghouse X24C8

Improved version of J34-WE-30 engine incorporating a variable area jet nozzle and afterburner, and with higher thrust ratings. (Restricted security classification)

F3D-1
F7U-1

J35-A-2

Allison TG-180-A-1

The J35-A-5 engine as modified for the FJ-1 airplane. (Restricted security classification)

FJ-1

J35-A-4

Allison TG-180-C2

The J35-A-11 engine as modified for the FJ-1 airplane; very similar to the J35-A-2 engine. (Restricted security classification)

FJ-1

XJ40-WE-6

Westinghouse X40E2

A 7500 lb thrust engine with eleven stage axial flow compressor, single annulus combustion chamber, two stage reaction turbine, and variable area jet nozzle. (Confidential security classification)

--

J42-P-6

Pratt & Whitney Nene I

Similar to J42-P-4 but with Improved Lucas Fuel Pumps. (Restricted security classification)

F9F-2

XJ44-R-2

Ranger 1J11A

A 1060 lb thrust engine with single stage mixed flow compressor, single annulus combustion chamber, and single stage turbine. (Restricted security classification)

Guided Missiles

XJ46-WE-2

Westinghouse X24C10

A 4200 lb thrust engine with twelve stage axial flow compressor, single annulus combustion chamber, two stage reaction turbine, variable area jet nozzle, and afterburner. (Restricted security classification)

--

J48-P-2

Pratt & Whitney JT7A

A 6250 lb thrust engine somewhat similar to the J42 series angines, with single stage double entry centrifugal flow compressor, nine can-type combustion chambers, single stage reaction turbine, and coolant injection system. (Restricted security classification)

--

(c) Turbo-Prop Engines

XT34-P-2

Pratt & Whitney PT-2

A 4570 H.P.* engine incorporating a single power unit with 11 stage axial flow compressor, 8 can-type burners, three stage turbine, and reduction gear box with single rotation propeller shaft. (Restricted security classification)

--

XT36-D-2

Chrysler A-86A

A 1400 H.P.* engine incorporating a single power unit with seventeen stage axial flow compressor, regenerator, ten can-type burners, two stage turbine, and reduction gear box with single rotation propeller shaft. (Restricted security classification)

--

XT38-A-2

Allison Model 501

A 2700 H.P.* engine incorporating a single power unit with seventeen stage axial flow compressor, eight can-type combustion chambers, four stage turbine, and reduction gear box with dual rotation propeller shafts. (Restricted security classification)

--

XT40-A-2

Allison Model 500

A 5500 H.P.* engine incorporating twin power units of the XT38 type coupled to a single gear box with dual rotation propeller shafts. (Restricted security classification)

XA2D-1

XT40-A-4

Allison Model 500

Similar to XT40-A-2 engine but with long extension shafts between each power section and the gear box. (Restricted security classification)

XP5Y-1

XT40-A-

Allison Model 500

Similar to XT40-A-2 engine but with modified gear box accessory drives. (Restricted security classification)

XA2D-1

*Equivalent Shaft Horsepower

2. The turbo-jet engine designations listed herein supplement the designations promulgated through reference (a).

/S/
THOS. S. COMBS
Rear Admiral USN
Deputy and Assistant Chief of Bureau of Aeronautics