Fast helicopters

When flying forward, the Diskrotor Helicopter disk plane has a positive
pitch angle relative to the ground. The thrust necessary for forward flight
is provided by the jet stream and not by the rotor as a conventional
helicopter does. A model acc.to your proposal has flown stright and level 5
years ago. The disk airfoil has similar abilities as a conventional airfoil
with a partially open split flap, which are surprisingly good. See Ira H.
Abbot: Theory of Wing Sections or similar.

George

wrote in message
...
"George Vranek" wrote:

helicopters. Please have a look at www.vranek.ch/diskrotor.htm and
publish

The diskrotor/diskCopter has been discussed here before. The
conclusion was that it was impractical and probably impossible. When
flying forward, the normal helicopter disk plane has a negative pitch
angle relative to the ground. Putting a huge round airfoil up there
with a negative pitch angle would make you crash and not fly faster.
Not only that, but the disk "airfoil" would not really be a very good
airfoil with the same shape on both ends would it. If you disagree, I
suggest you build a model and fly it faster than 100 mph and see what
happens.

Dennis.


Dennis Hawkins
n4mwd AT amsat DOT org (humans know what to do)

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