Douglas C-21/26/29 Dolphin
1930
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Douglas C-21/26/29 Dolphin

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.

3-View 
Douglas C-21/26/29 DolphinA three-view drawing (740 x 968)


Specification 
 MODELC-21
 ENGINE2 x Wright R-975-3, 261kW
 WEIGHTS
    Take-off weight3893 kg8583 lb
    Loaded weight2659 kg5862 lb
 DIMENSIONS
    Wingspan18.29 m60 ft 0 in
    Length13.36 m44 ft 10 in
    Height4.29 m14 ft 1 in
    Wing area52.21 m2561.98 sq ft
 PERFORMANCE
    Max. speed225 km/h140 mph
    Cruise speed192 km/h119 mph
    Ceiling4330 m14200 ft
    Range885 km550 miles

Comments
Ken, 20.04.2014

I am also a Radio Control Scale airplane builder. I have a set of plans for this plane but can find very little technical information, ie. how did the landing gear function? I hope to build the plane with operating gear for use both off the water and on land. Any help in the right direction to finding this information would be greatly appreciated.

Ken

Edward Power, 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, 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, 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, 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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