MAKE: Electrotor-Simplex ~ Rotor - Hub - Bar

• For DESIGN page see; 1570.html
• This bar is to allow twist (pitch) but resist bending (inplane and out-of-plane).
• Produce the bar with a 4º precone.
• Construction to be two S-glass or carbon, tow or unidirectional tape loops. Vacuum-bagged over winding frame and cured.
• It might be wrapped in unidirectional fiberglass at 90º to the carbon thread.
• Adjusting lead-lag by a pair of un-centric inserts in one of the blade attachment holes.
• Sizing:
• I think that the Gyrobee hub-bar is 2.5" wide by maybe .75" thick, ???? aluminum.
• Consider ultralight hub-bar as 2.5" * 1" = 2.5 sq-in aluminum 6061?. Divided by 2 rotors =1.25 sq-in. Divided by 2 sides of hub-bar = .625 sq-in. .6" high * 1" wide. Of course make wider since unidirectional fiberglass and unidirectional carbon may not have the tensile strength of aluminum, Then again, I think that they may have better tensile strengths??? Check later.

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