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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 | 44 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 |
| Edward Power, edreuben=att,net, 07.01.2013 In 1963, I spent about 40 hrs riding in 1934 Dolphin N-26K over parta of 29 Palms Marine base, Flew out of Yucca Valley Airport. It has wooden wings, The A/c was first owned by Bill Boeing, was then owned by Command Sae Planes of Sausolito, CA. It was white with green trim, It now has Coast Guard paint in Naval Air Museum, Pensicola, FL | | will harrison, eyedeedoc=aol.com, 26.03.2011 The Dolphin was the last aircraft designed exclusively by Donald Douglas, Sr. After the first test flight, he noted that on landing, water was getting into the engine housings. He immediately sat down, sketched a redesign for the nose fairing, and solved the problem. | | dave king, davelking=hotmail.com, 23.03.2011 I'm evaluating.For building an R/C model for an up comming float fly. THANKS for posting such a pert-e gal! | | Sid Gally, skg=pacbell.net, 08.10.2010 I once took a sightseeing flight over Santa Catalina Island in a Dolphin. The cost was a penny a pound and I paid $1.10. It left from the ramp at Hamilton Beach and took off and landed in the water. |
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