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Dolphin
Douglas Dolphin at Santa Catalina Island, California
Type	Flying boat
Manufacturer	Douglas Aircraft Company
Introduced	1931
Primary users	US Navy United States Coast Guard
Number built	58

The Douglas Dolphin was an amphibious flying boat. While only fifty-eight were built, they served a wide variety of roles: private "yacht", airliner, military transport, and search and rescue.

The Dolphin originated in 1930 as the "Sinbad", a pure flying boat without wheels. The Sinbad was intended as a luxurious flying yacht. The Great Depression had curtailed demand for such extravagance, so the Sinbad was sold to the United States Coast Guard.

Undaunted by the lack of demand, Douglas developed an improved Sinbad in 1931 that was amphibious, so it could land on water or land. This improved aircraft was named "Dolphin". The first two were purchased by Wilmington-Catalina Airlines to fly passengers between Los Angeles and Santa Catalina Island, becoming the first Douglas airliners. Subsequent examples were ordered by the US Navy and US Coast Guard for use as transports and search and rescue craft. The US Army Air Corps ordered several under the designations C-21, C-26, and C-29. Many were eventually ordered for their original purpose as luxury transports. Owners included William Boeing, the founder of the Boeing Company, and Philip K. Wrigley, the son of the founder of the Wm. Wrigley Jr. Company. One was even procured by the US Navy as a transport for President Franklin D. Roosevelt. Although never used by Roosevelt, this was the first aircraft procured to provide transportation for the President of the United States.

US Coast Guard RD2 in June, 1932

 Australia

• Royal Australian Air Force

 United States

• US Army Air Corps
• US Army Air Force
• United States Coast Guard
• US Marine Corps
• US Navy

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General characteristics

• Crew: Two, pilot and co-pilot
• Capacity: Six passengers
• Length: 45 ft 1 in (13.74 m)
• Wingspan: 60 ft 0 in (18.29 m)
• Height: 14 ft 0 in (4.27 m)
• Wing area: 592 ft² (55.0 m²)
• Empty weight: 7,000 lb (3,175 kg)
• Max takeoff weight: 9,530 lb (4,323 kg)
• Powerplant: 2× Pratt & Whitney R-1340-96 radial engines, 450 hp (336 kW) each

Performance

• Maximum speed: 156 mph (217 km/h)
• Range: 720 miles (1,159 km)
• Service ceiling: 17,000 ft (5,180 m)
• Rate of climb: 710 ft/min (216 m/min)

Comparable aircraft

• Douglas Sinbad

Designation sequence

• Army C- series: C-18 - C-19 - C-20 - C-21 - C-22 - C-23 - C-24 - C-25 - C-26 - C-27 - C-28 - C-29 - C-30 - C-31 - C-32
• Army OA- series: OA-1 - OA-2 - OA-3 - OA-4 - OA-5 - OA-6 - OA-7
• Navy series: RD - R2D - R3D - R4D

Related lists

• List of military aircraft of the United States
• List of military aircraft of the United States (naval)