General Aerodynamics

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Dominick
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General Aerodynamics

Post by Dominick » Tue Jun 12, 2007 11:48 pm

Why is induced flow generally considered "bad" for fully articulated rotor systems in-ground-effect (IGE) as opposed to out-of-ground effect (OGE)?
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hal_nesbitt
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Post by hal_nesbitt » Wed Jun 13, 2007 1:12 am

Well, I'm no engineer, but I believe that with fully articulated rotor (3 blade) helicopters, a big risk is ground resonance. IGE being at a lower altitude, the angle of attack is reduced and the reduced induced flow carries the hazard of the helicopter touching the ground, and the vibrations caused can produce ground resonance.

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