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6-blades
The Hughes OH-6 Cayuse (hope that's correct) morphed into the Allison turbine-powered M-D 500,with 5-bladed rotor of low rpm/high static pressure.
The US ARMY flies these out of Fort Bliss at night,with no lights,and you can't hear them until they're on top of you.
I suspect that the 6-blade prop helps in the same manner.
Thanks for images!
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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