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Post Info TOPIC: Sikorsky R-4 single-blade rotor testbed


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Date: May 1st
Sikorsky R-4 single-blade rotor testbed
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In August of 1948, a modified R-4 helicopter was flight-tested with an asymmetrical, counterbalanced single-blade rotor. The purpose was to test the feasibility of the concept when Sikorsky was experimenting with the idea of stowed-rotor V/STOL aircraft, which would be the genesis of the basic S-57 / XV-2 design around 1949, before it was submitted as a competitor in the early-50s Army/Air Force Convertiplane Program. The experiment yielded acceptable results, despite concerning aerodynamic vibratory loads.

The following pics are from the Sikorsky Archives and a research document on the Eugene M. Gluhareff pressure jet engine:



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Administrator

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Footage of it can also be seen in this documentary, at 10:16:



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