The Wasp Major was Pratt & Whitney’s last big piston engine. Although four rows in the radial configuration seems a cooling problem, the Wasp Major was effectively cooled by staggering each of its ...

Object Details Manufacturer Pratt & Whitney Physical Description Type: Reciprocating, 28 cylinders, radial, air cooled, four rows Power rating: 2,424 kW (3,250 hp) at 2,700 rpm Displacement: 71.5 L (4 ...