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Variants
YH-21 Work Horse - USAF version of the HRP-2 for service test, eighteen built
H-21A Work Horse (Model 42) - Same as YH-21 with detailed changes and powered by one 1250hp Wright R-1820-102, re-designated CH-21A in 1962, 38 delivered (including six for the Royal Canadian Air Force)
H-21B Work Horse (Model 42) - Same as H-21A but with engine re-rated at 1425hp and seats for 20 troops, autopilot as standard and limited armour protection and external fuel tanks, became CH-21B in 1962, 163 built.
CH-21B Work Horse.
H-21C Shawnee (Model 43) - USAF version built by Vertol.[7] US Army version of the H-21B, became CH-21C in 1962, 334 built. An additional 32 were built under licence by Weser Flugzuegbau for the West German Army.
H-21D Shawnee (Model 71) - Two H-21Cs re-engined with two T-58-GE engines.
CH-21A - H-21A redesignated in 1962.
CH-21B - H-21B redesignated in 1962.
CH-21C - H-21C redesignated in 1962.
HH-21B - SH-21B redesignated in 1962.
Model 42A - Conversion by Vertol Aircraft (Canada) of eight Royal Canadian Air Force H-21s for civilian use. Equipped to carry 19 passengers or 2,820lb (1279kg) of internal cargo or a 5,000lb (2268kg) slung load.
Model 44A - Commercial 19-passenger transport version of the H-21B.
Model 44B - Commercial 15-passenger/freighter version of the H-21B.
Model 44C - Commercial eight-passenger executive version of the H-21B.
HKP-1 - Swedish designation of the Model 44A, nine bought new, two former civil Model 44Bs were modified to HKP-1 standard for the Swedish Air Force
Sources:
Wikipedia: H-21 Shawnee
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