On Sun, 3 Jul 2005 at 12:57:46 in message
, Ash Wyllie wrote:
But what is the control system George? Attempts at concentric
helicopters have been made before. But if there are no collective or
cyclic pitch controls then how is it controlled?

THrottle instead of collective, weight shift instead of cyclic. Ghod knows
what you use instead of tail rotor collective.

Well autogiros used to have a jump mode, when they clutched the rotor to
make an initial vertical take-off. Their control system was one where a
single lever tilted the rotor both fore and aft and side to sided.
However that does not exactly fit with the 'advance the throttle' to
climb quote! Except you _do have_ to advance the throttle to climb in an
autogiro.

They don't need much of a tail rotor to control yaw rotation because of
the contra rotating rotors. An autogiro usually has a fin and rudder and
sometime stabilisers as well and relies on forward speed to control
rotation.

--
David CL Francis