Built by Continental Motors under license. Designed for use in armored vehicles.[3][14] Continental R9-A 500 hp (370 kW) at 2,300 RPM up to 4,000 ft (1,200 m), 525 hp (391 kW) at 2,300 RPM for takeoff. Continental's improved post-war version.[12] Hispano-Suiza 9Q Licence built R-975 J-6 Whirlwind Hispano-Suiza 9Qa variant of the Licence built R-975 J-6 Whirlwind Hispano-Suiza 9Qb variant of the Licence built R-975 J-6 Whirlwind Hispano-Suiza 9Qc variant of the Licence built R-975 J-6 Whirlwind Hispano-Suiza 9Qd variant of the Licence built R-975 J-6 Whirlwind Hispano-Suiza 9Qdr variant of the Licence built R-975 J-6 Whirlwind