A non-aerodynamic proof that a lifting wing pushes down on the earth
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Dec 31, 2012
, 11:35 AM
Joined Oct 2000
Helicopter downwash.... note the extent before it curls up.
This can be "seen" flying an r/c heli close to any object on the ground.
In the two heli image, that flat 1/4" plate will stop the heli from crossing it if the heli approaches slowly.
This behavior is seen any time the heli is approaching anything taller than the ground.. a reluctance to advance above the block without some forward stick.
The rotor downwash ahead of the heli feeds back to the rotor, while the downwash directly below just keeps going down.. if even for only a 1/4".
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Downwash from an Air Attack heli reloading at the Fin & Feather Lake.
1/4" ply plate will stop the heli from crossing it.