TCDS ATC 98

WRIGHT AERONATICAL DIVISION CURTISS-WRIGHT CORPORATION MODELS: Wright Cyclone SR and SGR-1820F-2, R and GR-1820F-2A T.C. NUMBER: ATC 98 Model - Cyclone SR-1820F-2 SR-1820F-2 SR-1820F-2 R-1820F-2A Type - 9RA Direct Drive Direct Drive Direct Drive Direct Drive Rating: Maximum continuous, hp, rpm, in.Hg. at: Rated pressure altitude (ft.) 715-1950-34 1/2-3000 735-1950-34 1/2-4000 770-1950-36 1/2-2500 770-1950-2000 S.L. pressure altitude 680-1950-34 1/2-S.L. 695-1950-34 1/2-S.L. 740-1950-36 1/2-S.L. 755-1950-36-S.L. Take-off (one minute), hp, rpm, in.Hg. 715-1950-36 735-1950-36 770-1950-37 1/2 770-1950-36 1/2 hp, rpm, at full throttle - - - - - - - - - - - - - - - - Fuel (minimum octane aviation gasoline) 87 - - - - - - - - - - - - Bore and stroke, in. 6.125 x 6.875 - - - - - - - - - - - - Displacement, cu. in. 1823 - - - - - - - - - - - - Compression ratio 6.4: 1 - - - - - - - - - - - - Weight (dry), lbs. 940 - - - - - - - - - - - - Propeller shaft, SAE No. 40 - - - - - - - - - - - - Supercharging (Impeller gear ratio) 7: 1 - - - - - - - - - - - - Carburetion Stromberg NA- U8H Stromberg NA- F7C - - - - - - - - venturi diameter, in. 2-1/2 2-1/4 - - - - - - - - Ignition, dual Scintilla VAG- 9DF-R5, SF9L or SF9LN magnetos - - - - - - - - - - - - NOTES 1a, 5, 6 1a, 4, 5, 6 1b, 5, 6 1b, 2, 5, 6 Certification basis Approved Type Certificate No. 98 MODELS: Wright Cyclone SR and SGR-1820F-2, R and GR-1820F-2A (Continued) T.C. NUMBER: ATC 98 (Continued) Model - Cyclone SGR-1820F-2 SGR-1820F-2 SGR-1820F-2 GR-1820F-2A Type - 9RA 8: 5 8: 5 or 16: 11 16: 11 16: 11 reduction gearing reduction gearing reduction gearing reduction gearing Rating: Maximum continuous, hp, rpm, in.Hg., at: Rated pressure altitude (ft.) 700-1950-34 1/2-3000 720-1950-34 1/2-4000 750-1950-36 1/2-2500 750-1950-36-2600 S.L. pressure altitude 660-1950-34 1/2-S.L. 680-1950-34 1/2-S.L. 725-1950-36 1/2-S.L. 740-1950-36-S.L. Take-off (one minute), hp, rpm, in.Hg. 700-1950-36 750-1950-37 1/2 750-1950-37 1/2 750-1950-36 1/2 hp, rpm, at full throttle - - - - - - - - 810-1950 810-1950 Fuel (minimum octane aviation gasoline) - - - - - - - - - - - - - - - - Bore and stroke, in. - - - - - - - - - - - - - - - - Displacement, cu. in. - - - - - - - - - - - - - - - - Compression ratio - - - - - - - - - - - - - - - - Weight (dry), lbs. 1035 - - - - - - - - - - - - Propeller shaft, SAE No. - - - - 40 (8: 5), 50 (16: 11) 50 - - - - Supercharging (impeller gear ratio) - - - - - - - - - - - - - - - - Carburetion Stromberg NA- U8H Stromberg NA- F7C or NA-F7E - - - - - - - - venturi diameter, in. 2-1/2 2-1/4 - - - - - - - - Ignition, dual - - - - - - - - - - - - - - - - NOTES 1c, 5, 6 1d, 5, 6 1e, 3, 5, 6 1e, 2, 3, 5, 6 Certification basis Approved Type Certificate No. 98 NOTE 1. Serial numbers eligible: (a) Up to and including 22767 (b) 22768 and up (c) Up to and including 22736 (d) Up to and including 22746, 22756, 22756, 22759, 22810, 22813, 22815 to 22820, 22833, 22834, 22838, to 22859, 22865, 22874 to 22876, 22961 to 22974, inclusive. (e) 22747 and up except those listed in (d) NOTE 2. These engines equipped with F-50 type cylinders. NOTE 3. The full throttle rating is allowed only when 100 octane fuel or finned type spark plugs are used. NOTE 4. Engine serial number 21920 eligible with take-off rating of 770-1950-37 1/2-S.L. NOTE 5. 80 Octane aviation gasoline may be used provided 550 hp is not exceeded. NOTE 6. Approval expired 7/12/37. No engines of these models manufactured after this date or with serial numbers above 24176 (models SR-1820F-2 and R-1820F-2A) or 24407 (models SGR-1820F-2 and GR-1820F-2A) eligible for use in certificated aircraft.