The Kinner B-5 was a enlarged K-5 with the bore increased from 4.25 to 4.625 inches and stroke from 5 to 5.25 inches.
The U.S. Military designation for the Kinner B-5 was the R-440.

models

• R-440-3: 132 hp (98 kW)

specifications

• Five cylinder, air-cooled, radial
• Displacement: 441 cubic inches (7.2 litres)
• Bore x stroke: 4.625 x 5.25 inches
   

used by

• Ryan PT-21 Recruit