Terry: Your description sounds interesting but it also sounds like side
translation would not be possible without cyclic which would make hovering
quite a dance.

--
Stuart Fields
Experimental Helo magazine
P. O. Box 1585
Inyokern, CA 93527
(760) 377-4478
(760) 408-9747 general and layout cell
(760) 608-1299 technical and advertising cell

www.vkss.com
www.experimentalhelo.com


"Terry Spragg" wrote in message
...
Peter Seddon wrote:
This website gives quite an interesting history of Kamov who have been
making co-axials for many years
http://avia.russian.ee/vertigo/peopl...v/index_2.html and are the
makers
of this latest one.

On this latest single place the lower swashplate is visible in some
photos
and it looks like the pitch arms for the upper rotor go down the center
of
the main shaft.

Regards Peter


"Stuart & Kathryn Fields" wrote in message
...

Very interesting. I can't see any pitch control linkage to the blades.
Don't read Russian, but do they say anything about autorotation?


I don't see any evidence of pitch links at all, unless they are
hydraulic, with rotating hydraulic joints, hydraulic tubes inside
the shafts, and very small actuators.

For autorotation, it could use engine torque actuated linkages to
adjust collective for autorotation. If engine torque goes to zero,
pitch goes to negative, pilot alarm is momentary negative gees and
imposed descent - forced autorotation on power loss. I suggested
such an idea several years ago on this forum. You don't think they
stole my idea? Or maybe they adjust pitch by moving the relative
position of three concentric rotating shafts up and down a half inch
or so? There might not be any cyclic control at all.

Why not?

Yaw control by differential rotor torque and tailfin in downwash /
slipstream?

Now, if it was only quiet enough to tolerate in your back yard,
everyone would want one. The tranny design is a doddle kept secret
by commercial mil / ind complex, its an automotive differential,
with one half turned inside out.

Terry K