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The Piasecki PD-22 (H-21) was an improved version of the HRP-2 Rescuer. It was the 4th tandem-rotor design from Piasecki. Because of its shape, covering the tail rotor transmision shaft, it was commonly called the Flying Banana. The H-21 had a fully articulated, three bladed, counter-rotating rotor system, with twin vertical fins fitted at the tail. Early versions were powered by a single Curtis-Wright R1820-103 Cyclone 1150 hp supercharged piston engine. It held a side by side crew of 2, in a dual-control cabin. Equipped with a hoist and a dorsal quick-release cargo sling, on a fixed tricycle undercarriage, it offered optional wheels, skis, or floats. The H-21 first flew on 11 Apr 1952. 707 of all versions were built, including two H-21D experimental models with a single and a twin turboshaft, replacing the piston Cyclone. 
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| Derivatives and Versions of this model: | | |
| Model | Year | History | | XH-21 | | | | | YH-21 | 1950 | The YH-21 / PD-22 was nicknamed the Workhorse by the US Air Force, who received 18 from Feb - Aug 1953. This was the first production batch of H ...
| | | H-21A | 1951 | The US Air Force followed the YH-21 order with an order for 38 H-21As [51-1523..15269 and 52-8487..8492]. The last six H-21As were delivered to ...
| | | H-21B | 1952 | Following the A model, the USAF ordered 168 H-21Bs [51-15854..15880, 52-8665..8679, 52-8681..8709, 53-4322..4402, 54-4000..4008, 55-5127..5131, a ...
| | | H-21C | 1952 | | |  B-V V42 | 1952 | Boeing-Vertol Model 42A. Related to H-21B and C models. The customer was Rick Helicopters of Canada, 10 were delivered; they were Commercial H- ...
| | | B-V V43 | 1956 | Boeing-Vertol 43: Customers were France and Germany, with 139 delivered between May 1956 to May 1960. They are listed as a utility model, for bo ...
| | | H-21D | 1957 | | | | B-V V44 | 1957 | | |
| Organisations / Units with this Model: | | |
| Construction Numbers on database of H-21 or its versions | |
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| Construction Numbers of this Model: | Help Us | |
| C/N | Built as | Year | History | | B-21 | | |  51-15873 : Piasecki PV-17 c/n B-21, ff?; del USAF as H-21B 51-15873; unit xfers unk; del JASDF as H-21B 02-4751 unk; units unk; wfu & soc unk.
 02-4751 : del JASDF as H-21B 02-4751 unk; units unk; wfu & soc unk.
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| B-24 | | | 51-15877 : Piasecki PV-17 c/n B-24, ff?; del USAF as H-21B 51-15877; unit xfers unk; del JASDF as H-21B 02-4752 unk; units unk; wfu & soc unk.
02-4752 : del JASDF as H-21B 02-4752 unk; units unk; wfu & soc unk.
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| B-26 | | | 51-15879 : Piasecki PV-17 c/n B-26, ff?; del USAF as H-21B 51-15879; unit xfers unk; del JASDF as H-21B 02-4753 unk; units unk; wfu & soc unk.
02-4753 : del JASDF as H-21B 02-4753 unk; units unk; wfu & soc unk.
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| B-31 | | | 52-8668 : Piasecki PV-17 c/n B-31, ff?; del USAF as H-21B 52-8668; unit xfers unk; del JASDF as H-21B 02-4754 unk; units unk; wfu & soc unk.
02-4754 : del JASDF as H-21B 02-4754 unk; units unk; wfu & soc unk.
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| B-61  | | | 52-8699 : Piasecki PV-17 c/n B-61, ff?; del USAF as H-21B 52-8699; unit xfers unk; del JASDF as H-21B 02-4755 unk; units unk; w/o 10Sep64.
02-4755 : del JASDF as H-21B 02-4755 unk; units unk; w/o 10Sep64.
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| B154 | h-21b | 1954 | N64606 : Piasecki H-21B, c/n B154, ff:1954; ordered by USAF as H-21B, 54-4001, FMAP to France; del ALAT as 8000114, 1955; xfer Aeronavale as F-YDCB, unk; rtnd ALAT as 8000114, AAG, 1960; wfu 1968; sold Midwest Helicopter Airways as N64606, unk; sold Bruce W. Rogers, Ramona, CA as N64606, 15Dec90; now registered to Classic Rotors Museum, Ramona, CA.
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 | FR41 | H-21C | |  FR41 : ALAT; 2011 pictured preserved at the Centre d Etudes et de Loisirs Aerospatiaux (CELAG meseum), Grenoble France
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| B-148 | | | 53-4398 : Piasecki PV-17 c/n B-148, ff?; del USAF as H-21B 53-4398; unit xfers unk; del JASDF as H-21B 02-4756 unk; units unk; wfu & pre Hamamatsu AB Museum Nov99.
02-4756 : del JASDF as H-21B 02-4756 unk; units unk; wfu & pre Hamamatsu AB Museum Nov99.
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| B-149 | | | 53-4399 : Piasecki PV-17 c/n B-149, ff?; del USAF as H-21B 53-4399; unit xfers unk; del JASDF as H-21B 02-4757 unk; units unk; wfu & soc unk.
02-4757 : del JASDF as H-21B 02-4757 unk; units unk; wfu & soc unk.
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| B-159 | | | 54-4006 : Piasecki PV-17 c/n B-159, ff?; del USAF as H-21B 54-4006; unit xfers unk; del JASDF as H-21B 02-4758 unk; units unk; w/o 16Mar63.
02-4758 : del JASDF as H-21B 02-4758 unk; units unk; w/o 16Mar63.
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| B-160 | | | 54-4007 : Piasecki PV-17 c/n B-160, ff?; del USAF as H-21B 54-4007; unit xfers unk; del JASDF as H-21B 02-4759 unk; units unk; wfu & pre Gifu AB Museum, Nov99.
02-4759 : del JASDF as H-21B 02-4759 unk; units unk; wfu & pre Gifu AB Museum, Nov99.
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| B-161 | | | 54-4008 : Piasecki PV-17 c/n B-161, ff?; del USAF as H-21B 54-4008; unit xfers unk; del JASDF as H-21B 02-4760 unk; units unk; wfu & soc unk.
02-4760 : del JASDF as H-21B 02-4760 unk; units unk; wfu & soc unk.
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| FR107 | H-21C | | FR107 : ALAT /ESI preserved from ???? Le Luc.
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13 C/N found.
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