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Pratt & Whitney “Wasp Jr.” R985

The R985 features a built-in centrifugal supercharger and direct-drive propeller. The R-985 was in production from 1930 through 1953.  Over 39,000 were produced.

The Wasp Junior was used on the Vultee BT-13 Valiant, Beechcraft -18 Expeditor (and its AT-7 and AT-11 variants), and the DeHavilland L-20A Beaver.


Manufactured by: Pratt and Whitney
Power: 450 h.p. @ 2300 r.p.m
Cylinders: 9; radial; aircooled
Displacement: 985 cu. in.
Weight: 668 pounds
First manufactured: 1929