Editing Lockheed Model 14 Super Electra (section)

==Design and development==
The design, developed by a team led by Don Palmer, was a scaled-up version of the original [[Lockheed Model 10 Electra|Model 10 Electra]], with passenger seating increased from 10 to 14. It was intended to compete commercially with the contemporary [[Douglas DC-2]] and the [[Boeing 247]]. The first Model 14 flew on July 29, 1937, piloted by [[Marshall Headle]]. Early 14's used the [[Pratt & Whitney R-1690 Hornet]] engine; later the [[Wright R-1820 Cyclone 9]] was offered as an option.

Lockheed built a total of 114 Model 14s; another 119 were built under license in [[Japan]] by the [[Tachikawa Aircraft Company]] under the designation '''Tachikawa Type LO Transport Aircraft''' ''Thelma''.
Another 121 were built by [[Kawasaki Aerospace Company|Kawasaki Aircraft Company]] under the designation Kawasaki Type 1 cargo transporter. The type 1's cargo fuselage was lengthened by {{convert|1.4|m|ftin|abbr=on}}, enabling the fitting of larger cargo doors.<ref>[http://military.sakura.ne.jp/ac/ki56.htm "Kawasaki Type 1."] ''sakura.ne.jp'' Retrieved: June 16, 2010.</ref>

In Japan during the late 1930s and early 1940s, in common with most large economies of the time, research was being conducted into pressurised cabins for high-altitude flight. In similar fashion to the [[Lockheed XC-35]], in the United States, [[Tachikawa Aircraft Company|Tachikawa]] incorporated a pressurised cabin into new forward and centre fuselage sections for one of the locally built '''Lockheed Type LO Transport Aircraft'''. The resulting research aircraft was given the long designation '''Tachikawa-Lockheed Type-B high altitude research aircraft''' and the company designation '''Tachikawa SS-1'''. The first conversion was completed in May 1943, re-engined with 2x {{convert|1080|hp|kW|abbr=on|order=flip}} [[Mitsubishi Ha-102]] 14-cylinder radial engines. The two conversions carried out a brief flight testing programme.