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The Lockheed XR4O was the designation given to a single example of the Lockheed Super Electra that was used by the US Navy.
The Super Electra was an expanded version of the standard Lockheed 10 Electra, capable of carrying fourteen passengers (up from ten). It had the same basic layout as the Electra, with a low mounted tapered cantilevered wing, high mounted tail with twin vertical control surfaces and a flat sided fuselage with large cabin windows. The Model 14-H2 was powered by two Pratt & Whitney S1E2-G radial engines. It was meant to compete with the Douglas DST/ DC-2/ DC-3 family, but was far too small, and was produced in much lower numbers.
The XR4O-1 was a single aircraft that was delivered to the Navy on 15 October 1938. It was powered by two 850hp Pratt & Whitney R-1690-52 engines, and was based on the civilian Model 14-H2.
The XR4O-1 was used as a staff transport, and remained in service until 1944 when it was struck off the Navy’s strength.
Super Electra
Engine: Two Pratt & Whitney R-1690-52
Power: 850hp each
Crew: 2
Wing span: 65ft 6in
Length: 44ft 4in
Height: 11in 5in
Empty weight: 10,300lb
Loaded weight: 15,200lb
Maximum weight: 17,500lb
Maximum speed: 247mph at 7,000ft
Cruising speed: 215mph
Service ceiling: 24,300ft
Normal range: 1,500 miles
Maximum range: 2,060 miles
Lockheed Aircraft Since 1913, René J Francillon