This is very interesting. It is a Blade CX2 model helicopter. Took me a
while to figure out what is going on. The control functions of the two
rotors have been separated. The upper rotor is a pitch and roll stability
system or auto pilot only. The bar acts as a large gyro.

The lower rotor is the command roll and pitch control with a totally ridged
rotor. The cyclical pitch is controlled by a swash plate. There is no over
all rotor pitch or angle of attack change mechanism. Speed up both rotors
and the helio goes up. Slow them
down and the helio goes down.

For yaw... speed one rotor up and slow the other down and vice versa. There
is a solid state gyro that controls yaw and can be over ridden.

The mechanism has been vastly simplified compared to a conventional counter
rotating blade helicopter like the Kamov.

Reputedly this is a very stable and easy model helio to fly.
 http://www.youtube.com/watch?v=6W8LocBLAc4

I am interested in this subject due to the reputed difficulty of landing a
VTOL. If you try to translate (at high speed) a VTOL in the vertical mode,
the aero loads on the aero surfaces (wing rudders) tend to force it to pitch
down regardless of the type of rotor controls or direction. Same thing
happens in windy conditions. That is not what you want to happen during
landing. It is what you want when taking off.

Therefor a thrust vector system like the Airscooter would be perfectly
adequate for a VTOL. Even this simplified Blade CX2 system would be over
kill.

Paul Lamar ...No rotor no motor.



Regarding Coaxial Helicopter Controls, EZYCOPTER structure may be of
interest to all:
http://www.yoshine.com.tw/cds.htm
http://www.youtube.com/watch?v=7GS-RSvEKWw

Charles Lin  clin@mail.com


The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Youtube key word UTUBPLEASE
Copyright 1998-2008 All world wide rights reserved.