DC-3
The first DC-3 flew on 17 December 1935, the 32nd anniversary of the Wright Brothers' first powered flight
Initial production versions of the DC-3 used Wright R-1820-G5 9-cyl Cyclone engines with 850hp (685 kW) each.
B-18 1935
The first DB-1 flew in April 1935, with 9 Cylinder 850hp Wright R-1820-G5 engines.
CW-21
The first example flew in September 1938 with an 850hp R-1820-G5 engine, and was demonstrated in China.
P-35
This then developed into the SEV-1XP, a single seat fighter powered by a Wright R-1829 radial engine. This aircraft was entered in the USAAF's 1935 Fighter competition. None of the entrants in this contest were awarded a contract. Seversky then re-engined the SEV-1XP with the 9-Cyl Pratt & Whitney R-1830 G-5 Twin Wasp engine,
theoretically giving 850hp. Seversky then ripped this motor out of his P-35 prototype in 1939 because it blew up and was unreliable. The engine
wasn't suited to the high-g stress of fighter combat, probably because of the way lubricating oil reached the cylinders in the early models. Oil leaks and oil starvation are a constant of the Brewster Buffalo story, even in the B-239 that did so well in Finnish service.
That is all,
