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Pratt & Whitney R-985 Wasp Junior
Variants

R-985-1/Wasp Junior A
300 hp (224 kW) at 2,000 RPM at sea level and for takeoff. First production version.

R-985-9, -11, -11A, -21, -46/Wasp Junior TB, TB2
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.

R-985-13, -17, -23, -33, -48, -50; R-985-AN-2, -4, -6, -6B, -8, -10, -12, -12B, -14B./Wasp Junior SB, SB2, SB3
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.

R-985-25, -27, -39, -39A & R-985-AN-1, -1A, -3, -3A/Wasp Junior T1B2, T1B3
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.

R-985-AN-5, -7/Wasp Junior B4
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.


Sources:
Wikipedia
P&W R-985 Maintenance Manual 1977
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