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Old 07-07-2009, 10:03 AM   #20 (permalink)
joediamond
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Quote:
Originally Posted by nyc863 View Post
interesting link, thanks.

edit: in a vertical auto-rotation at zero pitch, on a real heli, are the blades going to stay spinning at full speed while also generating lift to counter acceleration downwards? doesn't the relative wind work to slow them to a stop pretty quick?
Real helis don't do vertical autos, that's the reason they have a height/velocity chart. While they can do vertical autos from a low hover when they do that they are using the energy stored in the rotor to get the machine down.

this link:

http://www.dynamicflight.com/aerodynamics/autos/

has a lot of good information regarding the aerodynamics during an autorotation, as you can see negative pitch is not required.
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