Rudder counterbalance ?

[Peter Pennisi]

Hi all,


Most of you would be aware that a number of Composite ARF "IMPACT" have
failed from suspected rudder flutter.


I raise a couple of questions to this forum;


I know that the purposes of counterbalances are to reduce the loads on
servos and linkages in our application but what are the side effects.

Can a rudder counterbalance create undesired torsional stresses on the
fuselage?

Can a poorly configured and tensioned pull-pull linkage to the rudder be
more susceptible to flutter if the rudder has a counterbalance?

What other types of forces are at play with counterbalances?

I am just trying to find a reason for the relatively high failure rates
against this design.

It is the same old thing- why are some people having problems and others
don't. (Similar story to 4-stroke exhaust headers)

I will be test flying my model soon so I am obviously concerned.  

Regards,

Peter



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