To minimize weight, the aircraft was to have a steel tubular frame with aluminum skin and plywood wings. The inline-8 engine, designed by Harry Miller of Indy 500 racing fame, was to sit behind the pilot in a configuration similar to the P-39 Airacobra. The USAAC ordered an XP-57 prototype. When design was delayed due to financial problems in the company, the contract was allowed to lapse. No production aircraft was built because the USAAC was moving towards larger fighters and had lost interest in the project.
Prototype specifications (XP-57)
General characteristics
Crew: One
Length: 26 ft 7 in (8.1 m)
Wingspan: 28 ft 5 in (8.7 m)
Height: 8 ft 0 in (2.4 m)
Wing area: 120 sq ft (11.1 m2)
Empty weight: 3,400 lb (1,542 kg)
Powerplant: 1 × Miller L-510 8-cylinder inline mounted at center behind pilot. Double propellers. , 720 hp (537 kW)