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Re:Re:RV-9A Insurance

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federigo(at)pacbell.net
Guest

Posted: Sat Jan 07, 2006 9:03 pm Post subject: Re:Re:RV-9A Insurance



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
Guest

Posted: Sun Jan 08, 2006 8:57 am Post subject: Re:Re:RV-9A Insurance



 	  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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Posted: Sun Jan 08, 2006 10:46 am Post subject: Re:Re:RV-9A Insurance



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
Guest

Posted: Mon Jan 09, 2006 9:12 am Post subject: Re:Re:RV-9A Insurance



 	  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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Posted: Mon Jan 09, 2006 2:11 pm Post subject: Re:Re:RV-9A Insurance



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
Guest

Posted: Mon Jan 09, 2006 5:27 pm Post subject: Re:Re:RV-9A Insurance



..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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