Pratt & Whitney R-985 Wasp Junior - Variants


Wasp Junior A
U.S. military version: R-985-1.
300 hp (224 kW) at 2,000 RPM at sea level and for takeoff. First production version.
Wasp Junior TB, TB2
U.S. military versions: R-985-9, -11, -11A, -21, -46.
420 hp (313 kW) at 2,200 RPM at sea level, 440 hp (328 kW) at 2,300 RPM for takeoff. Early B-series versions rated for sea-level performance.
Wasp Junior SB, SB2, SB3
U.S. military versions: R-985-13, -17, -23, -33, -48, -50; R-985-AN-2, -4, -6, -6B, -8, -10, -12, -12B, -14B.
400 hp (298 kW) at 2,200 RPM up to 5,000 ft (1,500 m), 450 hp (336 kW) at 2,300 RPM for takeoff. Common B-series versions rated for performance at altitude.
Wasp Junior T1B2, T1B3
U.S. military versions: R-985-25, -27, -39, -39A; R-985-AN-1, -1A, -3, -3A.
450 hp (336 kW) at 2,300 RPM up to 1,500 ft (460 m) and for takeoff. Common B-series versions with improved sea-level performance.
Wasp Junior B4
U.S. military versions: R-985-AN-5, -7.
450 hp (336 kW) at 2,300 RPM up to 2,300 ft (700 m) and for takeoff. Vertically mounted development of T1B3, for helicopters.
Wasp Junior SC-G
525 hp (391 kW) at 2,700 RPM up to 9,500 ft (2,900 m), 600 hp (447 kW) at 2,850 RPM for takeoff. Experimental high-powered version with propeller reduction gearing.

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