In article ,
Bob Whelan wrote:

On 9/20/2010 10:01 AM, Dave Nadler wrote:
Does anybody have a drawing or picture of the
torsion linkage used to drive the ailerons in
early Ventus or the rudder in Libelle ?
Or can tell me what that's called ?

Thanks !
Best Regards, Dave

PS: It was used to avoid external bellcranks,
with their associated fairings and drag. It's
out of favor because it is problematic
(cost, weight, stiction, etc), and it turns
out the fairings add negligible drag...

Dave,

No drawings or pix, &, I've no idea what it's called, but George Applebay
used
the mechanism on Zunis, so he or Fidel at the shop might know...

Regards,
Bob W.

Pictures of the rudder drive mechanism can be found on the Libelle Yahoo
group.

http://groups.yahoo.com/group/libellesailplanes/

You will probably have to join the group. The pictures are in the
"Photos" section under the heading H301 Rudder Linkage. Here's the url
direct to the pictures if it helps:

http://groups.yahoo.com/group/libell...m/294037972/pi
c/list

Seriously interesting mechanism. The kind of thing to keep one awake at
night trying to visualize how it works. Elegant, but fussy to get right
with bushings and shims. The aileron mechanism looks completely
different, but works the same way. No bushings or shims, though.