Hawker TyphoonHawker Typhoon airplane model. Responding to 1937 RAF specifications requiring a substitute for the "Hurricane" fighter, the Hawker Aircraft Company built 2 prototypes, one for each type of engine indicated in the specifications. Thus the "Tornado" was fitted with the Rolls Royce Vulture engine, and the "Typhoon" with the RR Napier Sabre engine. While the first project was abandoned, the second continued its development despite structural and power