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Bendix Model K

In 1944, Vincent Bendix (of washing machine fame) established Bendix Helicopters (later renamed Helicopters Inc.). The Bendix designer, Martin Jensen, devised the Bendix Model J single-seater which used a system of coaxial rotors and was driven by a 450hp Pratt & Whitney R-985 piston engine. This was followed by the Model K - with an enclosed tube and fabric fuselage but with a much smaller 100hp Continental C-100 engine. The Model K (NX41817) made its maiden flight in June 1945, but Bendix eventually ceased operations in 1949 without achieving certification.

R.Simpson "Airlife's Helicopter and Rotorcraft", 1998

Bendix Model K

Ted Bohrer, e-mail, 08.07.2017reply

I was a good friend of Martin Jensen and stayed with him in Long Beach in 1965 as we rebuilt the coax. I have some film of his 1940s machine flying

Marty Dougherty, e-mail, 07.06.2024 Ted Bohrer

Hi - did you post this video somewhere that I can see it? Would love to have a look! Martin Jensen was my grandfather.


евгенl, e-mail, 22.04.2017reply

вот откуда у России вертолёты с соосной схемой

George A. McCooubrey, e-mail, 31.12.2007reply

The writer worked for Bendix Helicopters during the devlopment period of 1946 & 1947.Other Info Sources, like this one, usually confuse the planned 4-place production helo, the model J, with the development test single place model K, which was in fact the first Bendix Helo to fly. It was a fortunate decision, for the original control concept patented by Vincent Bendix required redesign. The model J first flew in 1947 incorporating the lessons learned from the testing of the model K.

Brad Meerfeld, e-mail, 11.02.2007reply

Are plans or bluprints available on this aircraft. Please respond. Thank you!

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