Rudder counterbalance ?

[Bill Southwell]

That's not rudder flutter but fuselage flutter or elasticity!!!  Way
different problem.  :>)  

 

 

Bill  

 

  _____  

From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of Ron Van Putte
Sent: Thursday, April 28, 2005 1:16 PM
To: discussion at nsrca.org
Subject: Re: Rudder counterbalance ?

 


On Apr 28, 2005, at 1:37 PM, Gray E Fowler wrote:

I am in reality recommending getting above that buzz speed that you spoke
of, using stiffness. I am proposing that this is an easy thing to do without
adding counter weight or building a brick fuselage. My plane never buzzes or
flutters, but then again I have never used full throttle while diving at the
ground to find my buzz point, which is no doubt there somewhere. 
All of this assumes adequate push rods or pull pull stuff. 


Now I think I understand what Gray is referring to. I have seen some of
these flimsy creations, which you can't fly at full throttle for long and
always vertically upward. No full throttle operation level or with the nose
down. Those are simply puny airplanes, which would benefit from stiffening.
I saw one pilot give the command for an aileron roll and the wings rolled
more than 90 degrees before the tail started rotating. That's flimsy!

Ron Van Putte


" However, I disagree that increased stiffness is the best
way to go.  Most of what people call "flutter" is really "control 
surface buzz", because it is essentially a one-dimensional phenomenon.  
Flutter is reserved by experts in the area to refer to oscillatory
phenomenon involving two or more degrees of freedom (like wing 
bending/torsion or wing bending/torsion/aileron deflection)."


Gray Fowler
Principal Chemical Engineer
Composites Engineering

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