The Bendix K prototype in its second form, an unreal-looking egg shape. A print of this picture seems to be dated 27 November 1945. By January 1947 NX41817 was in its third form, with an open cockpit.

The Bendix Model K prototype initially flew with an uncovered fuselage and later with a fully enclosed, egg-shaped fuselage. By January 1947 it was in this form, with an open cockpit. Oddly the Model K and the larger Model J were apparently both named Whirlaway. Bendix Helicopter closed its doors in 1949. NX41817 then went to NACA for rotor research work according to a NASA document. An end date for this is not known to us. Photo from: NASA Langley

The story of Hadley Field says the Bendix helicopters were tested there. The factory was at Stratford, Connecticut. Photo by Bendix Helicopter Inc. Photo from: Civil Aviation Historical Society, Melbourne, Australia