"Trentus" wrote in
:

"Mr.Twistair" wrote in message
...
Joss, this heli is slightly described at http://twistairclub.narod.ru
including photos of it's step-by-step unfolding. It wasn't ever
flown. The main reason why is mostly explained as "no suitable engine
which would fit this design that time". I've heard that it was
designed to be powered by small rotary engine but the engine wasn't
actually built (never run good enough - to be exact).

Pardon me while I drop my guard and flash my ignorance to all and
sundry.

No tail rotor?
I assume the twin sets of rotors turned in opposite directions to
counter the resultant forces that would cause it to spin otherwise.
How would you then turn one? I believe you turn a helicopter by
altering the amount the tail rotor counters the tendency of the craft
to spin? How would you turn a helicopter that has no tail rotor.


Sorry about coming into this so late...

The coaxial rotor helicopters have fully-articulated rotors on both
heads. Yawing is acheived by increasing the pitch on one (and probably
decreasing the pitch on the other simultaneously, so no increase in overall
lift). This produces more drag from one head, less from the other, so the
anti-torque effect is minimized and the aircraft rotates against the
increased pitch rotor.

I, personally, would like to see a closeup of the swash plate and
links assembly, to see how they manage to get past the lower head to
articulate the upper. Everything I've thought of so far leaves out some
aspect of either collective, cyclic, or precession.


- Al.

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