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Pratt & Whitney R-1690-24

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Manufacturer	Pratt & Whitney
Popular name	Hornet
Configuration	9-cylinder Radial
Power (standard)	525hp
Power (takeoff)	0hp
Production	0

Displacement	27.7
Bore	0.1556
Stroke	0.1619
Compression ratio	6.0:1
Diameter
Length	1.295
Weight

Valvetrain
Fuel system
Fuel type	87 octane gasoline
Blower
Oil system
Cooling	Air cooled