Lockheed Model 10 Electra

Model 10 Electra
Amelia Earhart's modified Electra 10E
Role	Light airliner
Manufacturer	Lockheed
Designer	Hall Hibbard
First flight	February 23, 1934
Introduction	1935
Number built	149
Developed from	Lockheed Model 9 Orion
Variants	Lockheed XC-35
Developed into	Lockheed Model 12 Electra Junior Lockheed Model 14 Super Electra

The Lockheed Model 10 Electra is an American twin-engined, 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.

Design and development

Clarence "Kelly" Johnson is testing an Electra model with single vertical tail and forward-sloping windshield in the University of Michigan's wind tunnel.

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-engined design by Lloyd Stearman^[1][2] 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.^[3]

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. Upon receiving his master's degree, Johnson joined Lockheed as a regular employee, ultimately leading the Skunk Works in developing advanced aircraft such as the Lockheed SR-71 Blackbird.

The Lockheed Electra was one of the first commercial passenger aircraft with retractable landing gear to come equipped with mudguards as standard equipment, although aircraft with fixed landing gear commonly had mudguards much earlier than this.^[4]

Operational history

Lockheed 10B of Marshall Airways (Australia) in 1970, had been initially delivered to Ansett Airways in 1937

After October 1934 when the US government banned single-engined aircraft for use in carrying passengers or in night flying, Lockheed was perfectly placed in the market with its new Model 10 Electra. In addition to deliveries to US-based airlines, several European operators added Electras to their prewar fleets. In Latin America, the first airline to use Electras was Cubana de Aviación, starting in 1935, for its domestic routes.

Flight deck of a Model 10A, which has been updated with a more modern instrument panel

Besides airline orders, a number of non-commercial civil operators also purchased the new Model 10.^[5] In May 1937, H.T. "Dick" Merrill and J.S. Lambie accomplished a round-trip crossing of the Atlantic Ocean. The feat was declared the first round-trip commercial crossing of that ocean by any aircraft. It won them the Harmon Trophy. On the eastbound trip, they carried newsreels of the crash of the Hindenburg, and on the return trip from the United Kingdom, they brought photographs of the coronation of King George VI. Bata Shoes operated the Model 10 to ferry its executives between their European factories.

Probably the most famous use of the Electra was the highly modified Model 10E flown by aviatrix Amelia Earhart. In July 1937, she disappeared in her Electra during an attempted round-the-world flight.^[5]

Many Electras and their design descendants (the Model 12 Electra Junior and Model 14 Super Electra) were pressed into military service during World War II, for instance the USAAF's C-36. By the end of the war, the Electra design was obsolete, although many smaller airlines and charter services continued to operate Electras into the 1970s.^[5]

Electras were popular as private planes for royalty in Asia and Europe. In India, the Maharaja of Jammu and Kashmir and the Maharaja of Jodhpur both purchased them for their personal use in 1937.^[6]

Variants

Lockheed Y1C-36

Lockheed Y1C-37

Lockheed XC-35

The Electra was produced in several variants, for both civilian and military customers. Lockheed built a total of 149 Electras.

Electra 10-A

Powered by two Pratt & Whitney R-985 Wasp Junior SB, 450 hp (336 kW) each; 101 produced.

• Three built for the U.S. Army Air Corps as Y1C-36, redesignated as C-36 in 1938 and as UC-36 in 1943.
• Fifteen impressed by the U.S. Army Air Forces as C-36A, redesignated as UC-36A in 1943.
• One built as XR2O-1 for the U.S. Secretary of the Navy.
• One built as Y1C-37 for the Chief of the National Guard Bureau, redesignated as C-37 in 1938 and as UC-37 in 1943.

Electra 10-B

Powered by Wright R-975-E3 Whirlwind, 440 hp (340 kW) each; 18 produced

• Seven impressed by the U.S. Army Air Forces as C-36C, redesignated as UC-36C in 1943.
• One built as XR3O-1 for the U.S. Coast Guard for use by the Secretary of the Treasury.

Electra 10-C

Powered by Pratt & Whitney R-1340 Wasp SC1, 450 hp (336 kW) each; eight produced for Pan American Airways.

Electra 10-D

Proposed military transport version; none built.

Electra 10-E

Powered by Pratt & Whitney R-1340 Wasp S3H1, 600 hp (450 kW) each; 15 produced. The version used by Amelia Earhart.

• Five impressed by the U.S. Army Air Forces as C-36B, redesignated as UC-36B in 1943.

XC-35

Experimental pressurized research model powered by turbocharged Pratt & Whitney XR-1340-43, 550 hp (410 kW) each. The one production model was tested for the War Department by Lieutenant Benjamin S. Kelsey. For this work, the Army Air Corps was awarded the 1937 Collier Trophy.^[7]

Lockheed KXL1

A single Lockheed Model 10 Electra supplied to the Imperial Japanese Navy Air Service for evaluation.

Operators

Military operators

Lockheed 10A restored in wartime RCAF markings

Lockheed Electra 10A in Royal Air Force service

U.S. Navy XR2O-1

 Argentina

• Argentine Air Force

 Brazil

• Brazilian Air Force

 Canada

• Royal Canadian Air Force

 Honduras

• Honduran Air Force

 Spain

• Spanish Republican Air Force

 Japan

• Imperial Japanese Navy Air Service

 United Kingdom

• Royal Air Force

 United States

• United States Army Air Corps/Army Air Forces
• United States Navy
• United States Coast Guard

 Venezuela

• Venezuelan Air Force

Surviving aircraft

Electra 10A "CF-TCC" in Trans-Canada Air Lines livery at the Western Canada Aviation Museum

Lockheed Electra at the Science Museum (London)

• 1011 – Electra 10A on static display at the Pima Air and Space Museum in Tucson, Arizona.^[8][9]
• 1015 – Electra 10E on static display at the Museum of Flight in Seattle, Washington.^[10][11]
• 1026 – Electra 10A on display at the Oakland Aviation Museum in Oakland, California.^[12]
• 1037 – Electra 10A on static display at the Science Museum in London.^[13]
• 1042 Muriel – Electra 10E on static display with the Amelia Earhart Foundation in Atchison, Kansas. Delivered to Atchison in August 2016, it was previously owned by Grace McGuire who had planned on using it to recreate Amelia Earhart's around-the-world flight.^[14][15][16]
• 1052 – Electra 10A on static display at the New England Air Museum in Windsor Locks, Connecticut.^[17] Originally an XR2O-1 used for transporting high ranking staff by the U.S. Navy, it is now painted in Northwest Airlines colors. At one point it was intended to use this machine for a recreation of the Earhart flight but it was not carried out.^[18][19]
• 1091 – Electra 10A airworthy with Ivo Lukačovič at Točná Airport in Točná, Prague.^[20] Registered as OK-CTB, it was one of two owned by Bata Shoe Co. in Prague, Czechoslovakia before WWII. At the outbreak of WWII it was evacuated to England, and onward to Canada where it served with the RCAF. After a succession of US owners, it was eventually reacquired by Bata Shoe, and fully restored by Wichita Air Services in Newton, Kansas.^[21] Wearing its original colors and registration marks, it was ferried back to Prague in May 2015.^[22][23]
• 1112 – Electra 10A on static display at the Canada Aviation and Space Museum in Ottawa, Ontario. Originally purchased by Trans-Canada Air Lines as their first new aircraft, it was transferred to the RCAF in 1939, with whom it served for most of World War II. After the war it was operated by a number of private owners. It survived into the 1960s when Ann Pellegreno between June 7 and July 10, 1967 flew the aircraft on a round-the-world flight to commemorate Amelia Earhart's last flight in 1937. After being acquired by Air Canada, it was restored in 1968 and donated to the museum.^[24][25]
• 1116 – Electra 10A airworthy at the Royal Aviation Museum of Western Canada in Winnipeg, Manitoba. It was one of a second batch of three Electras delivered to Trans-Canada Airlines. Found in Florida in the early 1980s by a vacationing Air Canada employee, it was returned to Winnepeg for restoration. In 1987 it flew across Canada in honor of the 50th anniversary of Air Canada – who owns and operates the aircraft.^[26][27]
• 1130 – Electra 10A on static display at the National Naval Aviation Museum in Pensacola, Florida.^[28][29]
• 1138 – Electra 10A on static display at the Museum of Transport and Technology in Auckland.^[30]
• 3105 – XC-35 in storage at the Paul E. Garber Preservation, Restoration, and Storage Facility of the National Air and Space Museum in Suitland, Maryland. It was used for testing pressurization.^[31]

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) 175 knots
• Cruise speed: 190 mph (306 km/h) 165 knots
• Range: 713 mi (1,150 km) 620 nm
• 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)

See also

Related development

• Lockheed Model 12 Electra Junior
• Lockheed Model 14 Super Electra

Aircraft of comparable role, configuration and era

• Avro Anson
• Airspeed Oxford
• Barkley-Grow T8P-1
• Beechcraft Model 18
• Boeing 247
• Douglas DC-2
• Caudron C.440 Goéland
• SAI KZ IV

Related lists

• List of aircraft of World War II
• List of aircraft of the Spanish Republican Air Force
• List of military aircraft of the United States
• List of military aircraft of the United States (naval)
• List of Lockheed aircraft

References

External links

Media related to Lockheed Model 10 Electra at Wikimedia Commons

• XC-35 in the collection of the National Air and Space Museum
• XC-35 from National Museum of the United States Air Force
• "Luxurious Air Yacht Is a Home with Wings" Popular Mechanics, January 1936 Electra converted for business travel.

Lockheed Electra 10A Restoration project, New Zealand: