Wright J-5 Whirlwind

The J-5 was an improved J-4 with redesigned cylinders and was the second Wright product to be named the Whirlwind. The J-5 Whirlwind achieved sudden fame when it was used to power Charles Lindbergh's "Spirit of St. Louis" to Paris in 1927.
The U.S. military designated this engine the R-790.


  • R-790: 225 hp (168 kW)


  • 9 cylinder, air-cooled, radial
  • displacement: 788 cubic inches (12.9 litres)
  • Bore x stroke: 4.5 x 5.5 inches

used by

  • Consolidated PT-3/NY-1
  • Ryan NYP