Brantly
Has anyone performed autorotations in the Brantly helicopter, and is able to comment on the autorotation in respect to; hover time, rate of descent, flare, etc.?
The inner portion of a helicopter's rotor disk 'drives' the outer portion during autorotations, and the Brantly has a very unique inner portion.
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Reprint of Brantly rotor specifications;
"The most outstanding feature of the Model B-2 is the three-bladed all metal main rotor which employs two sets of flapping hinges with lag hinges which are coincident with the outboard flapping hinges at approximately 40% of the blade radius. The inboard blade has a symmetrical section with a 29% thickness ratio and an effective chord of 8.84 inches. It is set at an angle of incidence which is 4 degrees greater than the outboard blade which has a modified NACA 0012 section with an 8 inch chord."
"This method of construction is designed to provide complete freedom of motion of the outboard blade sections which experience practically all of the aerodynamic forces of lift and drag."