| Helicopter 1 (HKP 1) Piasecki H-21 |
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| Role: | Fleet helicopter |
| Manufactor: | Piasecki-Boeing |
| In service: | 1956-1972 |
| Crew: | 3 - Pilot, observer, sonaroperator |
| Rotordiameter | 13,4m |
| Length: | 16,0m |
| Heigth: | 4,7m |
| Empty weight: | 3600kg |
| Take off weight: | 6515kg |
| Powerplant: | 1 × Curtis-Wright R-1820. 1070 kW (1450 hk) |
| Top speed: | 205km/ h |
| Range: | 580km |
| Ceiling: | 2880m |
| Armament: | 6x m/51 Depth charges or 2x 400mm ASW torpedo |
| Sensors: | Dipping sonar |