TCDS TC 125

MODELS: Wright Whirlwind R-975E-3 T.C. NUMBER: T.C. 125 Model - Whirlwind R-975E-3 Type Maximum continuous, of, Ipm, in.8g., at: Rated altitude (ft.) 420-2200-34-5-1400 S.L. altitude (ft.) 420-2200-34.8-S.I. Take-off (one minute). bf. rpm, in.Hg. 450-2250-36.5 Fuel quinimum occane aviation gasoline - CFR Motor Method fuel) 80 Pore and stroke, in. 5.0 x 5.5 cisplacement. cu. in. 972 compression ratio 6.3:1 Weight (dry). ibs. 675 (See NOTE 2) C.G. location (dry) Forward of mounting face, in. 7-0 Below propeller shaft, in. 0_2 Fropeller shaft, SAE NO. supercharger gear ratio 10.15:1 Carcuretion Stromberg NA-R9A carburetor with 2-5/8 in. venturi Ignition, dual scintilla VAG-SIF or SF-9R magnetos Ignition timing, degrees BTC 25 Certification Lasis Type Certificate No. 125 Froduction basis None. The manufacturer does not hold a production certificate for the production of engines under this type certificate and, therefore, each engine so produced is subject to a detailed inspection for workmanshif and conformity with the approved data by a Civil Aeronautics ADministration Agent. In addition, the engine must have a satisfactory cun-in including 5 hours at rated power and speed. Upon satisfactory completion of the above, the agent will tag the engine with Tag Form ACA 186. NOIE 00 degrees F... respectively. Maximum permissible cylinder head, barrel and oil inlet temperatures, 500 degrees F.. 325 degrees F., and NOTE 2. Engine number 18165 eligible with "F" type cylinder heads, P/N 64408 with weight increase of 35 lks.