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Developed from the one-off Sinbad operated by the US Coast Guard, the Dolphin was a six-eight-seat amphibian which was originally produced for commercial use. Its outstanding success, both with airlines and private operators, attracted the attention of the US government, with the result that contracts were awarded for the Army, Navy and Coast Guard. The Army received 24 as transports, bearing the designations C-21 and C-26, later becoming OA observation amphibians; while the Navy and Coast Guard received 10 and 13 respectively as RD transports.
 | A three-view drawing (740 x 968) |
| MODEL | C-21 |
| ENGINE | 2 x Wright R-975-3, 261kW |
| WEIGHTS |
| Take-off weight | 3893 kg | 8583 lb |
| Loaded weight | 2659 kg | 5862 lb |
| DIMENSIONS |
| Wingspan | 18.29 m | 60 ft 0 in |
| Length | 13.36 m | 43 ft 10 in |
| Height | 4.29 m | 14 ft 1 in |
| Wing area | 52.21 m2 | 561.98 sq ft |
| PERFORMANCE |
| Max. speed | 225 km/h | 140 mph |
| Cruise speed | 192 km/h | 119 mph |
| Ceiling | 4330 m | 14200 ft |
| Range | 885 km | 550 miles |
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