Molly Ayala
The Lockheed Electra is a significant aircraft in the history of aviation. The original Model 10 Electra, an all-metal, twin-engine monoplane, was developed in the 1930s and gained fame when it was flown by Amelia Earhart. The later Lockheed L-188 Electra, an American turboprop airliner, was the first of its kind built in the United States and featured unique characteristics, such as huge propellers and very short wings. The L-188 Electra has been used in various roles, including as a freighter and the basis for the Lockheed P-3 Orion maritime patrol aircraft. With its troubled start due to propeller resonance issues, the Electra underwent several design modifications to improve performance and passenger comfort. Today, the Electra continues to be of interest to aviation organizations, including the New England Air Museum and the USAF, which has awarded funding for the development of Electra's eSTOL vehicle and flight control systems.
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What You'll Learn
- The Lockheed L-188 Electra is an American turboprop airliner
- The Lockheed Model 10 Electra is an all-metal, twin-engine monoplane
- The Lockheed Electra was flown by Amelia Earhart
- The Lockheed Electra suffered a troubled start due to propeller resonance
- The USAF awarded Electra a Small Business Technology Transfer contract
The Lockheed L-188 Electra is an American turboprop airliner
The L-188 Electra has a maximum takeoff weight of 51,256 kg and a maximum landing weight of 44,499 kg. It can fly up to 28,400 feet, with a climb rate of 1,970 feet per minute and a cruising speed of 350 knots (or 400 mph). The aircraft has a cockpit crew of three and can carry 66 to 80 passengers in a mixed-class arrangement, although 98 could be carried in a high-density layout. The first variant was the Model 188A, followed by the longer-range 188C, which had room for 1,000 US gallons (3,800 L) more fuel and a maximum takeoff weight of 15,000 kg.
The L-188 Electra was developed to meet the needs of American Airlines for a domestic aircraft with a short to medium range that could transport 75 to 100 passengers. In June 1955, American Airlines placed an order for 35 aircraft, with the first prototype taking its maiden flight in December 1957. The L-188 Electra received its Civil Aeronautics Administration (CAA) type certification in August 1958. However, the aircraft suffered a troubled start, with early passengers complaining of noise in the cabin caused by propeller resonance. Lockheed addressed this issue by redesigning the engine nacelles, tilting the engines upwards by 3 degrees, resulting in improved performance and a more comfortable ride for passengers.
Several airlines in the United States flew the L-188 Electra, including American Airlines, Eastern Air Lines, Braniff Airways, Northwest Airlines, and Universal Airlines. The only European airline to operate the L-188 Electra was KLM, which used 12 aircraft between September 1959 and January 1969. Despite initial success, the L-188 Electra was eventually supplanted by jet airliners, and many of the aircraft were modified for cargo use. However, some Electras continued to be used in various roles into the 21st century. Unfortunately, the L-188 Electra was involved in several accidents and incidents, with multiple crashes and fatalities occurring throughout its service history.
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The Lockheed Model 10 Electra is an all-metal, twin-engine monoplane
The Lockheed Model 10 Electra is an American all-metal, twin-engine monoplane airliner developed by the Lockheed Aircraft Corporation. It was primarily produced in the 1930s to compete with the Boeing 247 and Douglas DC-2. The Lockheed Model 10 Electra was one of the first commercial passenger aircraft with retractable landing gear to come equipped with mudguards as standard equipment. The aircraft gained considerable fame after being flown by Amelia Earhart.
The name "Electra" comes from a star in the Pleiades, and it was Lockheed's first all-metal and twin-engine design by Lloyd Stearman and Hall Hibbard. The Model 10 Electra was also one of the first commercial passenger aircraft with retractable landing gear to be equipped with mudguards as standard. The standard Model 10 had an empty weight of 6,454 pounds (2,927.5 kilograms) and a gross weight of 10,500 pounds (4,762.7 kilograms). It could carry 10 passengers and a crew of two or three and had a range of 810 miles.
In October 1934, the US government banned single-engine aircraft for use in carrying passengers or in night flying, which created an opportunity for Lockheed to enter the competitive airliner market with its new Model 10 Electra. Several European operators added Electras to their pre-war fleets, and during World War II, it was used to transport the Assistant Secretary of Naval Air, David Ingalls.
The Lockheed Model 10 Electra has been exhibited in museums such as the New England Air Museum, which undertook the restoration of a 10A Electra. The aircraft has also been associated with notable incidents, such as its use by Amelia Earhart during her attempted round-the-world flight in July 1937, when she disappeared over the Pacific. Additionally, the Lockheed Electra exhibited certain landing characteristics that resulted in hard touchdowns if power was reduced at too high an altitude above touchdown.
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The Lockheed Electra was flown by Amelia Earhart
Amelia Earhart, possibly the most famous female pilot in history, flew the Lockheed Model 10 Electra. The Lockheed Electra was one of the first commercial passenger aircraft with retractable landing gear to come equipped with mudguards as standard equipment. It was also Lockheed's first all-metal and twin-engined design. The Model 10 was produced primarily in the 1930s to compete with the Boeing 247 and Douglas DC-2.
Earhart purchased the new Lockheed 10-E Electra in 1936 with funds from the Purdue Research Foundation. The aircraft was dubbed the "Flying Laboratory" as it was intended to be used as a test bed for new equipment. However, Earhart's true intention was to fly it around the world. The plane was modified to include four auxiliary fuel tanks in the passenger compartment, a navigator's station, the elimination of passenger windows, the installation of a Sperry autopilot, and various radio and navigation equipment and additional batteries.
On May 21, 1937, Earhart and well-known navigator Fred Noonan began their journey in Oakland, California, travelling east in the twin-engine Electra. They departed Miami on June 1 and reached Lae, New Guinea, on June 29, having flown 21 of 30 days and covered 22,000 miles. They left Lae on July 2 to head to their next refueling stop, Howland Island, but they never found it. A massive sea and air search was conducted, covering an area roughly the size of Texas, but Earhart and Noonan were eventually declared lost at sea on July 18, 1937.
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The Lockheed Electra suffered a troubled start due to propeller resonance
The Lockheed L-188 Electra, an American turboprop airliner, suffered a troubled start due to propeller resonance. The aircraft, built by Lockheed, first flew in 1957 and was the first large turboprop airliner built in the United States. While initial sales were good, the Electra soon faced challenges due to propeller resonance issues.
Passengers of early Electra aircraft complained about excessive noise in the cabin area forward of the wings. This noise was caused by propeller resonance, creating an unpleasant experience for those on board. In response, Lockheed took proactive steps to address the issue. They redesigned the engine nacelles, making a subtle adjustment by tilting the engines upwards by 3 degrees. These changes were implemented on the production line by mid-1959 and also offered as modification kits for aircraft that were already in service. As a result, the aircraft's performance improved, and passengers reported a more comfortable journey.
Unfortunately, the Lockheed L-188 Electra also experienced several fatal accidents. Between February 1959 and March 1960, three aircraft were lost in crashes. These incidents further contributed to the troubled start of the Electra. After the third crash, the Federal Aviation Administration (FAA) imposed a speed restriction on the Electra until they could determine the underlying cause.
The investigation revealed that two of the crashes were a result of an engine mount problem. The gearbox mounting had cracked, reducing rigidity and enabling a dangerous phenomenon known as "whirl mode flutter." To address this critical safety issue, Lockheed implemented an extensive and costly modification program called the Lockheed Electra Achievement Program (LEAP). This program focused on strengthening the engine mounts and the wing structures supporting them, as well as replacing some of the wing skins with thicker material.
Despite the successful modifications, the reputation of the Electra had already been impacted. The public lost confidence in the aircraft type, and the emergence of smaller jets further contributed to the decline in its popularity. Eventually, the Electra was relegated to smaller airlines, and production ended in 1961 after 170 aircraft had been built.
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The USAF awarded Electra a Small Business Technology Transfer contract
The USAF awarded Electra, in partnership with MIT, a Small Business Technology Transfer (STTR) contract in March 2022. This contract was awarded to advance the development of flight control systems for Electra's eSTOL (electric short takeoff and landing) vehicle.
Electra, a mobility aircraft company, now has a total of six active USAF SBIR (Small Business Innovation Research) and STTR contracts. These contracts have allowed Electra to mature several technologies for its aircraft, including precision flight controls, distributed electric propulsion, blown lift aerodynamics, acoustics, and hybrid-electric powertrains.
The eSTOL model is highly fuel-efficient, which helps the Air Force reduce its carbon emissions and execute its Agile Combat Employment doctrine. The small size of the eSTOL aircraft also makes it valuable in contested logistics environments where operating larger fixed-wing or rotorcraft platforms is difficult.
Electra has received investments from Lockheed Martin Ventures and has collaborated with them to develop potential solutions for the US government. The company has also received support from the USAF's Agility Prime program, which is committed to accelerating the electric aviation industry and exploring the unique capabilities of Electra's design.
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