In the mid-1930s, American engineer Robert L. Hall founded Springfield Aircraft Inc. in Springfield, Massachusetts. In 1932, the company built a light aircraft named the Hall Bulldog, often also referred to as the Hall-Springfield Bulldog.
Design and Specifications
It was a single-seat, strut-braced high-wing monoplane with a gull wing, powered by a 550 hp Pratt & Whitney R-985 Wasp Junior nine-cylinder air-cooled radial engine. It was fitted with a Hamilton Standard two-bladed propeller.
Racing History
Businessman Marion Guggenheim proposed that Hall convert the aircraft into a racer to compete in the National Air Races. The modified Bulldog participated, finishing sixth with an average speed of 215.57 miles per hour (347 km/h).
It was believed that an experimental propeller prevented the engine from delivering its full power.
Technical Specifications
| Modification | Bulldog |
| Wingspan, m | 7.92 |
| Aircraft length, m | 5.79 |
| Engine type | 1 Piston engine Pratt & Whitney R-985 Wasp Junior |
| Power, hp | 1 x 550 |
| Maximum speed, km/h | 365 |
| Cruising speed, km/h | 347 |
| Crew | 1 |
Image and diagram gallery of the Hall Bulldog
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