Heinkel He 70
The Heinkel He 70 Blitz (lightning) was designed in the early 1930s to serve as a mailplane for Deutsche Luft Hansa in response to a request for an aircraft faster than the Lockheed Vega and Orion (as used by Swissair) for use on short routes.
It was a low-wing monoplane, with the main characteristic of its design being its elliptical wing (which the Günther brothers had already used for the Bäumer Sausewind sports aircraft before they joined Heinkel) and its small, rounded control surfaces.
In order to meet the demanding speed requirements, the design minimised drag, with flush rivets giving a smooth surface finish and a retractable undercarriage. It was powered by a liquid cooled BMW VI V12, cooled by ethylene glycol rather than water, allowing a smaller radiator and therefore reducing drag. The pilot and radio operator were seated in tandem, with a cabin housing four passengers on two double seats facing each other.
The first prototype flew on 1 December 1932, and proved to have excellent performance, setting eight world records for speed over distance, and reaching a maximum speed of 377 km/h (222 mph).
Wikipedia: (https://en.wikipedia.org/wiki/Heinkel_He_70)
Passanger: 5 (for TPF)
Power: 750 PS
Speed: 174 MPH
Construction year: 1932 – 1945
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