Free timed-entry passes are required for the Museum in DC. The Wasp Major was Pratt & Whitney’s last big piston engine. Although four rows in the radial configuration seems a cooling problem, the Wasp ...

The largest radial engine ever to enter service, the Pratt & Whitney Wasp Major R-4360-59B, had four rows of seven cylinders. This allowed the engine to produce 4,300 hp, but it also meant that ...

Free timed-entry passes are required for the Museum in DC. Pratt & Whitney Aircraft's last piston engine was the 28-cylinder R-4360. It was the largest piston engine that the company ever produced.