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Junkers G 31 Trimotor
Technical Information

Background
The Junkers G 31 was an airliner produced in small numbers in Germany in the early 1920s. It was an all-metal, low-wing cantilever monoplane of conventional design, based on the G.24. The first G 31 was certified for air transport on September 7, 1926. The G31 was not a commercial success.

Production
A total of thirteen G 31s were built between 1926–1931. During 1935, replaced by the Junkers Ju 52 Trimotor military transport version.

Usage
Eight were purchased by Lufthansa. Four were sold to Australian operators in the Territory of New Guinea: G 31go "Bulolo I Paul" VH-UOU, G 31go "Bulolo 2 Peter" VH-UOV, G 31 VH-UOW and G 31 ba "Pat" VH-URQ one purchased by Bulolo Gold Dredging Company (BGD) and operated by Guinea Airways.

G 31 go
Built during 1929 as a freighter version with cargo door in the roof of the fuselage. Powered by three three Pratt & Whitney A2 Hornet radial engines that were hand cranked with an inertia starter which turned a flywheel for ignition.

Junkers in New Guinea
Four other G 31s were sold for freighting cargo in New Guinea. Operated by Guinea Airways, one was owned by the airline itself, while the other three were owned by the Bulolo Gold Dredging Company Flying from Lae to Bulolo. The first filght to Bulolo was in March 31, 1931. They carried an average load of 5,700 lbs. Flying without unecessay gear, limited fuel and good weather, they could carried loads up to 8,290 lbs, and many loads over 7,000lbs.

Technical Details
Crew  Two (Pilot, Co-Pilot)
Engine  3 x BMW-built Pratt & Whitney Hornet, 391 kW (525 hp) each
Span  30.30 m
Length  17.28 m
Maximum Speed  132 mph
Range  656 miles



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