TCDS ATC 103

MODELS: Wright Cyclone SR and SGR-1820F-3, R and GR-1820F-3A I.C. NUMBER: ATC 103 Model - Cyclone SR-18 20F-3 SR-1020F-3 R-1820F-3A SGR- 18 20F - 3 SGR-1820F-3 GR-1820F-3A Type - 9RA Direct drive Direct drive Direct drive 8:5 reduction 8:5 Or 16:11 16:11 reductior. gearing reduction gearing gearing Rating: Maximum continuous, hp. Ipm. in. Mg.. at: Rated pressure 710-1950- 710-1950- 715-1950- 710-1950- 700-1950- 700-1950- altitude (ft.) 34 1/2-5500 34 182-7000 33 182-7800 34 1/2-5500 34 1/2-7000 33 1/2-7800 S.L. pressure 650-1950- 650-1950- 650-1950- 650-1950- 645-1950- 645-1950- altitude 34 1/2-S.L. 34 1/2-5.1. 33 1/2-S.I. 34 1/2-S.I. 34 1/2-S.I. 33 1/2-S.L. Take-off (one minute), hp. rpm, in. Hg. 710-1950- 730-1950-36 710-1950- 710-1950- 710-1950-36 36 1/2 37 1/2 37 1/2 710-1850-37 710-1800- 37 1/2 Fuel (minimum octane aviation gasoline) 87 Fore and stroke, in. 6.125 × 6.875 - - tisflacement, cu. in. 1823 - _ Compression ratio weight (dry), lbs. 6.4:1 965 1060 _ _ - _ Fropeller shaft, SAE NO. 40 10(0:2) 50 50 16:11 Supercharging (impeller gear ratio) 8.31:1 - _ Carburetion Stromberg Stromberg Stromberg Stromberg NA-U8 H NA-FTC 0I NA- 08H NA-F7C or NA-F7E NA-F7E Venturi diameter, in. 2-112 Ignition, dual scintilla - - VAG-9DF-R5 SF9L Or SF9LN magnetos NOTES AfFroved Type Certificate No. 1032, 3 2, 3 2, 3 2, 3 1. 2, 3 Certification tasis NOTE 1. These engines equipped with F-50 type cylinders. NOIE 2. 80 octane aviation gasoline may be used provided 550 hf is not exceeded. Approval expired 7/12/37. No engines of these models manufactured after this date or with serial numbers (models SR-1820F-3 and F-1820F-3A) (models SGR-1820F-3 and GR-1820F-3A) eligibie for use in certificated aircraft.