Wright R-975 Whirlwind
Performance
Power output: 420 hp (313 kW) at 2,200 RPM up to 1,400 ft (427 m); 450 hp (336 kW) at 2,250 RPM for takeoff Specific power: 0.43 hp/cu-in (19.7 kW/L) Compression ratio: 6.3:1 Power-to-weight ratio: 0.62 hp/lb (1.02 kW/kg)

Wright R-975 Whirlwind

Section Title: Performance
Table Section Text: Power output: 420 hp (313 kW) at 2,200 RPM up to 1,400 ft (427 m); 450 hp (336 kW) at 2,250 RPM for takeoff Specific power: 0.43 hp/cu-in (19.7 kW/L) Compression ratio: 6.3:1 Power-to-weight ratio: 0.62 hp/lb (1.02 kW/kg)

Engine	Power, continuous	Power, takeoff	Compression ratio	Supercharger gear ratio	Octane rating	Dry weight

R-975E	330 hp (246 kW) at 2,000 RPM	5.1:1	7.8:1	73	635 lb (288 kg)

R-975E-1	365 hp (272 kW) at 2,100 RPM	6.1:1	7.8:1	73	660 lb (299 kg)

R-975E-3	420 hp (313 kW) at 2,200 RPM	450 hp (336 kW) at 2,250 RPM	6.3:1	10.15:1	80	675 lb (306 kg)

Continental R9-A	500 hp (373 kW) at 2,300 RPM	525 hp (391 kW) at 2,300 RPM	6.3:1	10.15:1	91	705 lb (320 kg)

Sentence(s)