REFLECTOR: Aileron slop
Brainard, Jerry
Jerry.Brainard at anthem.com
Tue Aug 15 16:17:28 CDT 2006
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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