"Bart" wrote in message
...
Phillip wrote:


I guess what I wondered was , other than a need to auto-rotate, a tilt
system would work on a helicopter the same as a gyro? Yes I know
auto-rotation is needed...I'm just wounding if the concept is the same.


That's what these kits mentioned (it's been a long time), you added
power
to go up, remove power to come down...seems simple enough. Don't think
I'd
like the idea of no collective control for auto-rotation.

No, a helicopter can not operate without a swashplate. Without the
swashplate
you'd just be able to go up and down. I'll probably draw some heat here
for
this,
but autogyros have more in common with airplanes than they do helicopters.
The aerodynamics are really different.

In horizontal flight, a helicopter is constantly changing the pitch of
each main rotor blade independently as it travels around in the circuit.
The advancing blade has negative relative pitch, and the retreating blade
has hugely positive relative pitch. Horizontal thrust is not derived by
tilting the mast.

The swashplate is controlled by the cyclic and collective together. The
two
flight controls are "mixed together" to move the swashplate. The
collective
moves the pitch of all blades equally, the cyclic tilts the swashplate to
cause the pitch changes to be become "cyclical".


Bart

I see those brothers (Nolan ?? ) built a coaxial with no swash plate....but
also no auto-rotation. twin engine though. How do they get away with it? I
guess the twin rotors would cancel all those bad things out.

This is one of the kits I saw.

http://www.airscooter.com

No swashplates, no collective, NO AUTOROTATION (scary) two engines I think.