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Library > Fact Sheets > "Wasp Junior" Engine
"WASP JUNIOR" ENGINE
Posted 1/30/2007
Printable Fact Sheet
Pratt & Whitney R-985 "Wasp Jr." Engine
This nine-cylinder air-cooled 985 cubic inch Pratt & Whitney R-985-AN-14B radial engine produced 450 horsepower and weighed 668 pounds. It featured a built-in centrifugal supercharger and direct-drive propeller, and its propeller rotation was right-handed.
The Wasp Junior was used on the Vultee BT-13 Valiant, Beech C-45 Expeditor (and its AT-7 and AT-11 variants), and the DeHavilland L-20A Beaver. The Engine Repair Shops at Hill Field repaired and overhauled variants of the Pratt & Whitney R-985 Wasp Junior radial engine during and after World War II.
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