TCDS E-261

Page No. 1 2 Rev. No. 3 3 Reformatted 10/94 DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION E-261 Revision 3 WRIGHT Cyclone 957C7BA1 December 28, 1983 TYPE CERTIFICATE DATA SHEET NO. E-261 Engines of models described herein conforming with this specification and approved data on file with the Federal Aviation Agency meet the minimum standards for use in certificated aircraft in accordance with pertinent aircraft specifications and applicable portions of the Civil Air Regulations provided they are installed, operated and maintained as prescribed by the approved manufacturers' manuals and other approved instructions. Type Certificate Holder Curtiss-Wright/Marquette, Inc. Fountain Inn, South Carolina Model Cyclone 957C7BA1 Type 7RA .5625:1 reduction gearing Rating (impeller gear ratio) 7.21:1 Maximum continuous, hp, rpm, in. Hg., at: Critical altitude (ft.) 700-2400-37.0-7300 Sea level 700-2400-39.5-S.L. Takeoff (Five minutes); hp, rpm, in. Hg. at: Critical altitude (ft.) 800-2600-42.5-5500 Sea level 800-2600-43.5-S.L. Fuel (Min. grade aviation gas.) Grade 91/96 Lubricating oils MIL-L-6082, WAS Spec. 5815 or 5818 Bore and stroke, in. 6.125 x 6.312 Displacement, cu. in. 1301 Compression ratio 6.2:1 Weight (dry), lbs. 1065 C.G. location (dry) Fwd. of mounting pad Centerline, in. 5.7 Above prop. shaft, in. 0.1 Propeller shaft, SAE No. 40 Crankshaft dampers - torsional and lateral 3½ order - front and rear Carburetion Stromberg PD9F1 carburetor Ignition, Dual Bosch S7LU-2 magnetos Timing, °BTC 20 Spark plugs See NOTE 5 Certification basis Type Certificate No. 261 Production basis Production Certificate No. 8 NOTE 1. Maximum permissible temperatures: Cylinder head 475°F 500°F for takeoff Cylinder barrel 325°F Oil inlet 220°F E-261 2 NOTE 2. Fuel and oil pressure limits: Min. Max. Fuel pressure limits 10 psi 21 psi Oil pressure limits 60 psi 70 psi NOTE 3. The following accessory drives are provided: Maximum Torque (in. lb.) Maximum Overhang Rotation* Speed** Continuous Static Moment (in. lbs.) Starter C 1:0 25800 300 Generator and Accessory gear C 3:31 500.0 2200 350 Fuel Pump CC 1.0 25.0 450  Vacuum Pump CC 1.5 100.0 800 25 Hydraulic Pump CC 1.5 250.0 1650 50 Propeller Governor C 1.0 125.0 825  *"C" = Clockwise viewing pad. "CC" = Counter clockwise. **Speed = X crankshaft. NOTE 4. In addition to complying with Part 13 of the Civil Air Regulations dated August 1, 1949, this engine also complies with engine airworthiness requirements contained in Annex 8, dated April 1949 of the International Civil Aviation Organization. NOTE 5. The following spark plugs are approved on these engines: AC 172, 181, 272, 281 BG RB19R-2, RB27R-1 Champion R119, R819, REA87N, RHA87N, RHB87N .....END.....