Introduced in 1933, the SS50 Super Scarab was a higher output version of the original Scarab with the cylinder bore increased to 4.625 inches. The U.S. military designation for the SS50 was the R-500.

models

• R-500-1: 165 hp (123 kW)

specifications

• Radial piston engine Seven cylinders
• Displacement: 499 cubic inches (8.2 litres)
• Bore x stroke: 4 5/8 x 4 1/4 inches

used by

• Fairchild Model 24
  Meyers OTW-145