Lockheed Model 10 Electra

https://en.wikipedia.org/wiki/Lockheed_Model_10_Electra

The Lockheed Model 10 Electra was a twin-engine, all-metal monoplane airliner
developed by the Lockheed Aircraft Corporation in the 1930s to compete with the
Boeing 247 and Douglas DC-2. The type gained considerable fame as one was flown
by Amelia Earhart on her ill-fated around-the-world expedition in 1937.

Some of Lockheed's wooden designs, such as the Orion, had been built by Detroit
Aircraft Corporation with metal fuselages. However, the Electra was Lockheed's
first all-metal and twin-engine design by Lloyd Stearman and Hall Hibbard. The
name Electra came from a star in the Pleiades. The prototype made its first
flight on February 23, 1934 with Marshall Headle at the controls.

Wind tunnel work on the Electra was undertaken at the University of Michigan.
Much of the work was performed by a student assistant, Clarence Johnson. He
suggested two changes be made to the design: changing the single tail to double
tails (later a Lockheed trademark), and deleting oversized wing fillets. Both of
these suggestions were incorporated into production aircraft.


Specifications (Electra 10A)

General characteristics
Crew: two
Capacity: ten passengers
Length: 38 ft 7 in (11.8 m)
Wingspan: 55 ft 0 in (16.8 m)
Height: 10 ft 1 in (3.1 m)
Wing area: 458 ft² (42.6 m²)
Empty weight: 6,454 lb (2,930 kg)
Loaded weight: 10,500 lb (4,760 kg)
Powerplant: 2 × Pratt & Whitney R-985 Wasp Junior SB, 450 hp (340 kW) each

Performance
Maximum speed: 202 mph (325 km/h)
Cruise speed: 190 mph (306 km/h)
Range: 713 mi (1,150 km)
Service ceiling: 19,400 ft (5,910 m)
Rate of climb: 1,000 ft/min (300 m/min)
Wing loading: 22.9 lb/ft² (111.7 kg/m²)
Power/mass: 11.7 lb/hp (142 W/kg)





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