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rgf(at)dcn.davis.ca.us
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 Posted: Thu Aug 20, 2009 7:23 pm Post subject: Adjusting the fiberglass wing tip trailing edge |
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I'm assembling an RV-9A QB. I have a question about the fiberglass wing
tip.
With wing in a cradle and the aileron bellcrank jig in place I put a
straight-edge to the designated holes on the end rib and adjusted the
aileron to proper alignment. Then I began fitting the wing tip. The
trailing edge of the tip is about 1/4" out of alignment with the aileron
trailing edge. Vans instructions say the two TEs should be aligned but no
guidance how to achieve that.
I was going to ignore the 1/4" misalignment, but on further research some
say that a tip misalignment will contribute to a wing heavy or light. Makes
sense, since the wing tip is 12" wide there and outboard of the aileron.
Some make it align by cutting through the tip TE, separating the top and
bottom somewhat to allow them to slide a bit so the tip will align with the
aileron. I'm reluctant to do that. And I got a brainstorm that maybe
careful heating of the wing tip aft, top and bottom, would allow the
fiberglass to "move" enough for the small adjustment.
So my questions are:
* Should a 1/4" aileron/tip trailing edge misalignment be fixed?
* If so, what's the preferred method? Would a careful heating work or is
this a fool's idea?
Thanks in Advance--
Ralph Finch
Davis, CA
Rv-9A QB SA
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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25781
Location: Livermore CA USA
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| Posted: Thu Aug 20, 2009 7:43 pm Post subject: Adjusting the fiberglass wing tip trailing edge |
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At 08:22 PM 8/20/2009 Thursday, you wrote:
| Quote: | --> RV-List message posted by: "Ralph Finch" <rgf(at)dcn.davis.ca.us>
So my questions are:
* Should a 1/4" aileron/tip trailing edge misalignment be fixed? |
IMHO, yes, that's too much. You will always regret not having properly dealt with it.
| Quote: | * If so, what's the preferred method? Would a careful heating work or is
this a fool's idea?
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Have you drilled the wing tip yet? If not, it is likely that you will be able to pull that 1/4" out by simply sliding the wing tip around in the wing skin over hang. However, if you haven't drilled yet, you might find that there is a fair amount of droop in the fiberglass in the span from the spar to the tip that will cause the trailing miss-alignment. You won't know for sure until its drilled. That's what they call "catch-22".
Slicing the trailing edge with a 409 Dremel cutoff wheel is no big deal but remember that you'll have to cut up the side about 12" to get enough play at the trailing edge without inducing a twist. I've got some pictures on my builder's log of how I did mine. They came out very nice, I think:
Four log entries:
[url=http://www.mykitlog.com/users/display_log.php?user=dralle&project=638&category 982&log=84213&row=34] http://www.mykitlog.com/users/display_log.php?user=dralle&project=638&category 982&log=84213&row=3[/url] [url=http://www.mykitlog.com/users/display_log.php?user=dralle&project=638&category 982&log=84213&row=34] 4[/url]
| Quote: | Thanks in Advance--
Ralph Finch
Davis, CA
Rv-9A QB SA |
Matt Dralle
RV-8 #82880 N998RV
http://www.mykitlog.com/dralle
FWF
[quote][b]
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Matt Dralle
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jfogarty(at)tds.net
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| Posted: Fri Aug 21, 2009 7:13 am Post subject: Adjusting the fiberglass wing tip trailing edge |
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Ralph, Do nothing until you set the wing incidence, with the wings on the
fuselage it may look different. Meaning no drill, no screwing, etc. I made
this mistake and my tips were off, I'm still trying to get them right. Just
my two cents.
Jim
RV9a Building
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lrsecaldwell(at)earthlink
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| Posted: Fri Aug 21, 2009 1:08 pm Post subject: Adjusting the fiberglass wing tip trailing edge |
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I used the following approach on my RV7
First i match drilled the wingtip to the wing and clecoed/screwed it yo the wing while in the cradle.
Then I centered the aileron and checked to see how far off the wing tip trailing edge was. Similar to yours about 1/4 inch.
Next I split the wingtip trailing edge. then I pushed it to remove the misalignment with the centered aileron, using a straight edge to check to the centered aileron.
In my case I did not have to split the side of the wingtip.
While holding the split wingtip in the correct place with clamps I drilled several # 40 holes though the wing tip trailing edge.
Now I could remove the clamps and return to the proper wingtip position by using clecos through the drilled holes.
Then I spread the split and inserted wet fiberglass cloth and clecoed the split together
Once dry I remove it from the wing and added more fiberglass internally for reinforcement and filled the #40 holes with epoxy filler.
It was easier to do than to write up the procedure.
Roger
[quote][b]
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martin(at)gbonline.com
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| Posted: Tue Aug 25, 2009 10:18 am Post subject: Adjusting the fiberglass wing tip trailing edge |
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8 years ago when I was finishing my RV8, I was confronted with similar
problems. I solved them by obtaining a full scale drawing of the wing
airfoil and making a full size plywood template of the airfoil. I then tra
nsferred the shape to the wing which allowed me to obtain perfect alignment
of the flap, aeleron and the wing tip on both wings.
Later after I had the airplane flying and de bugged, I then addressed the
wing heavy problem. I split the outboard edge of the wing tip and
then reformed the outboard trailing edge up or down as needed to get the
airplane to fly level. When I was satisfied, I reglued the trailing edge
and outboard edge as necessary. Good luck.
Dick Martin
N233
RV8
The fast one
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