|Type:||9-cylinder, single-row, supercharged, air-cooled, radial, piston|
|Displacement:||1,680.5 cu. in.|
|Power Output:||525 to 875 hp depending on model|
Per Pratt & Whitney, by the time production Wasp engines were being delivered, a design of a second series of more powerful engines was under way. They felt that this new engine, the Hornet, was an essential factor in the growth of the commercial air transport industry. It first flew in 1927 and was produced until 1942 with 2,944 were built. It was used by major aircraft manufactures such as Boeing, Lockeed and Sikorsky. Notable it was used in the Boeing 299 which was the prototype for the B-17, and it was also used by Burnelli UB-14 which developed into the CBY-3. It was also built under license by Fiat in Italy, as the A.59, and BMW in Germany as the model 132.
This 1934 engine was delivered to Sikorsky for its four engine S-42 flying boat which was famous for establishing air routes across the Atlantic and Pacific oceans, as well as thoughout the Caribbean and to South America.
Please contact Nick Hurley, Museum Curator, by email if you have any information or comments on the Pratt & Whitney R-1690 Hornet.