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Re:Re:RV-9A Insurance

 
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federigo(at)pacbell.net
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PostPosted: Sat Jan 07, 2006 9:03 pm    Post subject: Re:Re:RV-9A Insurance Reply with quote


John, to a first approximation, changing the length of one of the flap
push rods should not have made any difference to a heavy wing since the
flaps fly in trail. However this will change the neutral position of the
control stick. A difference in position of the control stick will change
wing balance since the aileron trim will now be pulling one way or the
other.
My heavy wing required a short wedge under the "light" aileron. There
was not enough adjustment in the aileron trim to compensate for a
passenger and a fuel loading imbalance.
Leland
67 hours
Quote:
>
I experienced a slightly heavy wing on the
first flight which I was able to trim out until landing for final adjustments.
1 turn in on the opposite flap push rod (1/20") has it flying straight.
John Kerr
N927BJ

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fcs(at)jlc.net
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PostPosted: Sun Jan 08, 2006 8:57 am    Post subject: Re:Re:RV-9A Insurance Reply with quote


Quote:
changing the length of one of the flap push rods should not have made any
difference to a heavy wing...

Not true. This is the most common, and VANS recommended method of
adjusting for the initial wing-low condition many RVs experience.
Considering the surface area of a flap, one or two turns makes a
significant difference, yet you hardly notice it visually.
You can always adjust the neutral stick position if necessary without
necessarily changing the aileron positions.


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gerf(at)gerf.com
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PostPosted: Sun Jan 08, 2006 10:46 am    Post subject: Re:Re:RV-9A Insurance Reply with quote


Hmmm, I just re-read the Vans pdf file I have that contains
instructions for dealing with a heavy wing and it doesn't
mention anything about the flaps ... did you mean aileron ?
I think the doc I have refers to the 6 - do you have a
different doc that's specifically for the 9 ?
g
Quote:


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fcs(at)jlc.net
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PostPosted: Mon Jan 09, 2006 9:12 am    Post subject: Re:Re:RV-9A Insurance Reply with quote


Quote:
did you mean aileron ?

No, I meant 'flap' (singular, as in one-side only).


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kerrjohna(at)comcast.net
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PostPosted: Mon Jan 09, 2006 2:11 pm    Post subject: Re:Re:RV-9A Insurance Reply with quote


Several comments about the fix for a heavy wing on a RV9 have been posted. Ailerons fly in trail, Flaps are fixed. As suggested, adjusting the length of the aileron actuators will provide neutral effect.
The fix for a heavy wing on RV6 etc was to pinch the trailing edge of one of the ailerons, I don't remember whether to pinch the heavy or light aileron.
Finding the "out of rig" element can be problematic given the muriad of places: Wing tips, flaps, wing incidence, to name few. It would be particularly difficult when looking for a measuremnt of 1/20" or less.
For discussion sake, lets say that I found one flap to 1/20" out of true and corrected it. I find it less offensive to do that than to "scab" a triangle shim on to the bottom of the light aileron. It is difficult to know the tone the Tom was using when he gave his answer, but why did he not find the offending out of rig element and correct that?
John Kerr
10 hours and loving it. 180mph today at 2350 rpm and 9 gph at 7500" and -5C.
-------------- Original message --------------
From: Leland <federigo(at)pacbell.net>


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fcs(at)jlc.net
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PostPosted: Mon Jan 09, 2006 5:27 pm    Post subject: Re:Re:RV-9A Insurance Reply with quote


..of course, RV-9's have 'unpinchable' trailing edges built up from wedge
rather than rolled like the 6's. I agree, it doesn't take much!


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