TCDS TC 149

MODEIS: Wright Cyclone SR and SGR-1820F-3B, -53 and Military R-1820-75 I.C. NUMBER: T.C. 149 Models - Cyclone SR-1820-F-53 and F-3B SGR-1820-F-53 and F-3B Type - 9RA Direct 16:11 reduction gearing Fating: Maximum continuous, hp, rEm, in. Hg., at: Rated pressure altitude (ft.) 745-2100-34-0-9600 730-2100-34-0-9600 Sea level fressure 685-2100-34-0-S.I. 670-2100-34.0-S.I. Take-off (one minute) hr. rpm, in.Hg. 785-2200-37.5 770-2200-37.5 Fuel (minimum octane aviation gasoline - CFR Motcr Method fuel) 87 Fore and stroke, in. 6.125 × 6.875 [isflacement, cu. in. 1823 compression ratio 6.4:1 height (dry) . Its. 1000 1095 Fropeller sahft, SAE NO. 40 50 supercharging (impeller gear ratio) 8.31:1 Carturetion Stromkerg NA-F7C or NA-FTE with 2-1/4 200 venturi, NA-F7F with 2-3/8 in. venturi, or Holley C.G. 1375 C, E, F. H or Chandler-Evans 1375DA-1 carburetor Ignition, dual Scintilla VAG-9DF, SF9L, SE9LN1, SF9IN2, SF913 or SF9L4 magnetos NOTES 1.2,3 1. 2 Certification basis Approved Type Certificate No. 149 Froduction basis None. engines under this type certificate and, therefore, each engine so produced is subject The manufacturer does not hold a production certificate for the production of to a detailed inspection for workmanship and conformity with the approved data ry a Civil Aeronautics Administration Agent. In addition, the engine must have a satis- factory run-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. NOTE 1. Maximum permissible cylinder head, barrel, and oil inlet temperatures, 500 degrees F., 325 degrees F.. and 200 degrees F.. respectively. The approval of SR and SGR-1820F-3B engine models expired as of 7/25/41. No engines modified to these models from the F-3 models after that date eligible for use in certificated aircraft. Type Certificate No. 149.