Design and Development
In 1947 Anton Flettner, a former German teacher and inventor, was brought to New York in the United States as part of Operation Paperclip. He was the developer of the former German helicopter Flettner Fl 282 "Kolibri" (Hummingbird), which had the principle of the into each other combing rotors, that solved the problem with the torque compensation. Anton Flettner stayed in the United States and become the chief designer of the Kaman company. He started to design new helicopters, using the Flettner double rotor.
The Huskie had an unusual inter-meshing contra-rotating twin-rotor arrangement with control effected by servo-flaps. The first prototype flew in 1947 and was adopted by the U.S. Navy with a piston-engine. In 1954 in an experiment by Kaman and the US Navy one HTK-1 was modified and flew with its piston engine replaced by two turbine engines becoming the world's first twin turbine helicopter. Later the Air Force adopted a version with one turboshaft engine: HH-43B and F versions.
Read more about this topic: Kaman HH-43 Huskie
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—Gottlob Frege (1848–1925)