Whitney ceased production of the Wasp Junior in 1953, having built 39,037 engines. Many Wasp Junior engines are still in use today in older bush planes and agricultural planes, as well as in antique aircraft. Some antique aircraft, such as the Boeing-Stearman Model 75, which originally used other engines, have had them replaced with the Wasp Junior to provide more power or for easier maintenance, since parts for the Wasp Junior are readily available. Variants Wasp Junior A U.S. military version: R-985-1 at 2,000 RPM at sea level and for takeoff. First production version. Wasp Junior S2A Wasp Junior TB, TB2 U.S. military versions: R-985-9, -11, -11A, -21, -46 at 2,200 RPM at sea level, 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 at 2,200 RPM up to , at 2,300 RPM for takeoff. Common B-series versions were 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 at 2,300 RPM up to and for takeoff. Common B-series versions with improved sea-level performance Wasp Junior B4 U.S. military versions: R-985-AN-5, -7. at 2,300 RPM up to and for takeoff Vertically mounted development of T1B3, for helicopters Wasp Junior SC-G at 2,700 RPM up to , at 2,850 RPM for takeoff Experimental high-powered version with propeller reduction gearing. Applications Airspeed Oxford (AS.46 Oxford V) Air Tractor AT-300 Avro Anson (Mk V) Barkley-Grow T8P-1 Beechcraft Model 18 and military derivatives Beechcraft Staggerwing D17S, D17W, G17S Bell XV-3 Bellanca 300-W Berliner-Joyce OJ Boeing-Stearman Model 75 (in aftermarket conversions) Bratukhin G-3 CAC Winjeel de Havilland Canada DHC-2 Beaver and L-20/U-6 military versions Douglas C-26 Dolphin Fleetwings BT-12 Gee Bee Model Z Grumman G-164 Ag Cat (some models) Grumman G-21 Goose Howard DGA-11 Howard DGA-15P Junkers F13 (Rimowa F13 replica) Koolhoven F.K.51 (some models) Laird Solution (LC-DW Solution, LC-DW300 Super Solution) Lockheed Model 10-A Electra Lockheed Model 12-A Electra Junior Max Holste MH.1521 Broussard McDonnell XHJH Whirlaway Naval Aircraft Factory N3N (in aftermarket conversions) North American BT-14 PWS-24bis Seversky BT-8 Sikorsky H-5 helicopter (and S-51 civil version) Sikorsky S-39 amphibian Snow S-2B and S-2C SIAI-Marchetti SM.102 Spartan Executive 7W Stinson Reliant SR-9F and SR-10F Vought OS2U Kingfisher Vultee BT-13 Valiant Waco S3HD Waco SRE Aristocrat Weatherly 201 series