REFLECTOR: Aileron slop

[Rene Dugas]

Thanks Jerry,

My plan would be only to supply tension to remove the play.  My thought
would not actually push or pull but pull on both bell cranks the same to
act as a tensioner  for the system.  Others have been discussion pushing
the speed envelope and I have been tempted but the ailerons concern me
most.  If flutter occurred and ripped the aileron off the other would be
jammed and flying a velocity with asymmetric drag and only rudders for
yaw and turn control would be dicy.

Rene'

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brainard, Jerry
Sent: Tuesday, August 15, 2006 3:17 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Aileron slop

 

Rene

 

Of course it would require the appropriate testing, but this sounds like
a really good solution.  I too have been thinking about the current
design and wondering if there is a simple and elegant solution that will
eliminate the slop (small though it is) without adding a bunch of drag.
With a small cable, like the rudder cable and pulleys, there should be
negligible added drag and may even reduce drag.  Rigged so that you are
only asking the primary cable to do work in tension, this might work
better than the current design.  Cable, by nature does not work as well
in compression, so this could be a bonus.  This is the first idea I have
heard that seems to meet the criteria.  

 

My idea (which it don't like as much) is to construct double ended bell
cranks and use two lighter cables on each side so that you always have a
pull on the aileron.  This would also allow a pre-load the cables to
eliminate slop.  More complexity and drag would be the question.  Your
idea is much more elegant. (read simple)

 

I guess in the final analysis, the most pertinent question is whether
this an area that needs to be improved.  I have not heard of aileron
flutter causing a problem for the Velo so maybe we are addressing
problem that does not exist.

 

- jerry

 

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Rene Dugas
Sent: Tuesday, August 15, 2006 3:29 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Aileron slop

Dear Fellows,

Because of the 90 degree turn in the aileron push pull cables there is
always some slop in the ailerons individually and together.  I
considered springs on the bell crank in the engine compartment but if
one broke in might be a problem.  It occurred to me that a cable
attached to each bell crank that ran through two pulleys on the firewall
as a large "U" with a turnbuckle to adjust the tension would take out
the slack and still allow full balanced function with great simplicity.
I worry about the flutter potential caused by the slack in the controls
and high speeds.  The cables would be tightened enough to force the
inner cable against the outside wall of the cable and remove the slack
caused as the inner cable flops minutely inside the outer cable housing.
I would consider attaching tie rod ends to the bell cranks using the
same bolt that attaches the cable to the bell crank.

Polite critique?

Rene'

Note: no slop in remained of system.  On third set of cables to decrease
this slack no better.


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