The Kinner R-5 was a enlarged B-5 with the bore increased from 4.625 to 5 inches and stroke from 5.25 to 5.5 inches.
The U.S. Military designation for the Kinner R-5 was the R-540.

models

• R-540-1: 160 hp (119 kW)
• R-55: 160 hp (119 kw)
   

specifications

• Five cylinder, air-cooled, radial
• Displacement: 540 cubic inches (8.8 litres)
• Bore x stroke: 5 x 5.5 inches

used by

• Meyers OTW
• Ryan PT-22 Recruit