TCDS E-257

Page No. 1 2 Rev. No. 1 1 Reformatted 11/94 DEPARTMENT OF COMMERCE CIVIL AERONAUTICS ADMINISTRATION E-257 Revision 1 PRATT & WHITNEY Twin Wasp E1 December 14, 1949 AIRCRAFT ENGINE SPECIFICATION Engines of models described herein conforming with this specification and approved data on file with the Civil Aeronautics Administration are rated as airworthy for use in certificated aircraft in accordance with pertinent specifications and the manufacturers' installation, operation, repair, and overhaul instructions. Manufacturer Pratt and Whitney Aircraft Division of United Aircraft Corp. East Hartford, Conn. Model Twin Wasp E1 Type 14RA-16:7 reduction gearing. Rating (7:1 impeller gear ratio) Maximum continuous hp, rpm, in. Hg. at: Critical altitude (ft.) 1400-2700-44.5-6900 Sea level 1400-2700-46.5-S.L. Take-off (5 minutes) hp, rpm, in. Hg. at: (dry) Critical altitude (ft.) 1650-2800-53.0-3000 Sea level 1650-2800-54.0-S.L. (with anti-detonant injection) Critical altitude (ft.) 1800-2800-53.0-2700 Sea level 1800-2800-54.0-S.L. Fuel (Minimum grade aviation gasoline) Grade 100/130 Bore and stroke, in. 5.75 x 6.00 Displacement, cu. in. 2181 Compression ratio 6.7:1 Weight (dry),lbs. 1870 C.G. location (dry) Forward of main crankcase rear face, in. 9.3 Below propeller shaft C.L., in. .9 Propeller shaft, SAE No. 51 Carburetion Bendix AR-48C1 carburetor Ignition, dual Scintilla S14LN-14 magnetos Ignition timing, °BTC 20 (Manual shift to 35 for cruise) Certification basis Type certificate No. 257 Production basis Production Certificate No. 2 NOTE 1. Maximum permissible cylinder head, barrel, and oil inlet temperatures are 540°F, 300°F, and 212°F respectively. The cylinder head temperature is measured with a well type thermocouple. NOTE 2. The following accessory drives are provided: Maximum Torque (in. lbs.) Max. Overhang Rotation * Speed * Continuous Static Moment, lb. in. Starter CC 3.0  5400 300 Generator C 3.0 500 2200 350 Vacuum or hydraulic pump - (2 provided) C 1.342 875 (for one) 3850 (for one) 350 1475 (total both) 6550 (total both) Power take-off C 3.0 1500 6600 350 Propeller governor C .897 125 825  "C" - Clockwise, viewing pad. "CC" - Counter clockwise viewing pad. "Speed" - Times crankshaft speed. E-257 2 NOTE 3. The Bendix AR-48 carburetor incorporates a built-in fuel pump. Minimum fuel pump outlet pressure to properly supply the engine are as follows: 16 psi up to 1100 BHP 16 to 18 psi for 1100 to 1650 BHP (str aight line variation with hp.) 18 psi for 1650 to 1800 BHP NOTE 4. The Twin Wasp E1 engine incorporates a built-in torquemeter and water injection equipment. For the 1800 BHP take-off rating, AD1 flow of 7 lbs/min. is required. The AD1 fluid may be composed of any one of the four following fluids by volume. (1) Methyl alcohol 50%, water 50% } (2) Methyl alcohol 60%, water 40% } Per Pratt & Whitney Spec. 509 (3) Methyl alcohol 25%, Ethyl alcohol 25%, water 50% } (4) Methyl alcohol 60 parts, water 40 parts, Anti corrosion oil 1 part (per British Spec. D-Eng. R.D. 2470, dated 1-8-46) .....END.....