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Guest sharky
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Hey Teach, how are things?

 

I had a chance to see the Sikorsky ABC (Advanced Blade Concept) in the early eighties (or late seventies????). The idea behind the stubbies providing lift at high speed is requiring less rotor pitch for the lift vector, and with small turbofans for propulsion, you didn''t need much pitch for the "go fast" vector, so there was much less exposure to blade stall. Much like the Piasecki design. I think they were hitting nearly 300 knots, if not more. It was a coaxial design, one shaft through the other, with either blade cancelling out the negative tendacies of the other at high speed. I''m not sure what happened to it, but I thought it had a future. Sure looked cool.

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