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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25203
Location: Livermore CA USA
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 Posted: Fri Jul 10, 2009 1:28 pm Post subject: Wing Tip Installation - Droopy Right... |
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Dear Listers,
I installed the wing tips on the -8 last week and they came out perfect. I was really pleased and relieved. They each took about 8 hours including cutting the plastic lens.
That's the good news. The bad news is that the right tip at the trailing edge came out about 1/2" low. The left one is exactly the correct height. I measured this by making the short aileron push rod the exact length stated on the plans (27 5/8" I think it was) and then using that W-730 jig to center the bellcrank and I assume the aileron.
Installation of the left wing tip, which I did first, went really smoothly and I had little trouble fitting or aligning. The right one, however, really fought me and in my zest to make sure that the lap joint between the metal skin and the fiberglass was perfect, I kind of neglected to triple check the height of the trailing edge of the tip as it related to the aileron. I focused more on the alignment of length of the two and that they were correct.
Anyway, I was rigging the ailerons this week and connecting to the control stick and that's when I noticed that the right tip was drooping about 1/2" lower than the aileron. I tried removing the tip RIB and fusing around a bit, but this didn't help, and then I tried slitting the trailing edge of the tip. This allowed me to align the tip to the aileron at the inboard side of the tip, but it didn't allow me to raise the outboard edge of the tip (without a whole bunch of extra fiberglass work).
I'm not opposed to getting a new wing tip and just starting over again, but I was wondering if anyone else had this same trouble, i.e. left tip fit great, right tip didn't fit very well and was low at the trailing edge. I'm wondering if its just a problem with the fiberglass layup.
Now that all of the holes in the skin for the wing tip mounting are dimpled (I used #6 screws), fitting a new tip is going to be a real tough job because I won't be able to get the tip flat against the skin. Arg...
Any feedback would be appreciated.
Matt Dralle
RV-8 #82880 N998RV
Wing-to-Fuselage Fairings (oh, and redoing the right wing tip)...
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n747jg(at)earthlink.net
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| Posted: Fri Jul 10, 2009 3:57 pm Post subject: Wing Tip Installation - Droopy Right... |
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Matt,
I ran into the same problem, and slitting the trailing edge worked
like a champ. The difference may be that I slit the trailing edge
before I had drilled the holes all the way around the tip that attach
it to the wing. You might try putting clecos in just the top section
of the wingtip, leave the bottom free, and see if that allows you to
move the wing tip into alignment. I gather all of the holes have
been drilled, so it may be too late, but it may give you an idea how
to attack it.
Good luck,
Jim Gray
N747JG RV-8 100 hours
On Jul 10, 2009, at 3:26 PM, Matt Dralle wrote:
| Quote: |
Dear Listers,
I installed the wing tips on the -8 last week and they came out
perfect. I was really pleased and relieved. They each took about 8
hours including cutting the plastic lens.
That's the good news. The bad news is that the right tip at the
trailing edge came out about 1/2" low. The left one is exactly the
correct height. I measured this by making the short aileron push
rod the exact length stated on the plans (27 5/8" I think it was)
and then using that W-730 jig to center the bellcrank and I assume
the aileron.
Installation of the left wing tip, which I did first, went really
smoothly and I had little trouble fitting or aligning. The right
one, however, really fought me and in my zest to make sure that the
lap joint between the metal skin and the fiberglass was perfect, I
kind of neglected to triple check the height of the trailing edge of
the tip as it related to the aileron. I focused more on the
alignment of length of the two and that they were correct.
Anyway, I was rigging the ailerons this week and connecting to the
control stick and that's when I noticed that the right tip was
drooping about 1/2" lower than the aileron. I tried removing the
tip RIB and fusing around a bit, but this didn't help, and then I
tried slitting the trailing edge of the tip. This allowed me to
align the tip to the aileron at the inboard side of the tip, but it
didn't allow me to raise the outboard edge of the tip (without a
whole bunch of extra fiberglass work).
I'm not opposed to getting a new wing tip and just starting over
again, but I was wondering if anyone else had this same trouble,
i.e. left tip fit great, right tip didn't fit very well and was low
at the trailing edge. I'm wondering if its just a problem with the
fiberglass layup.
Now that all of the holes in the skin for the wing tip mounting are
dimpled (I used #6 screws), fitting a new tip is going to be a real
tough job because I won't be able to get the tip flat against the
skin. Arg...
Any feedback would be appreciated.
Matt Dralle
RV-8 #82880 N998RV
Wing-to-Fuselage Fairings (oh, and redoing the right wing
tip)...<2009.07.02 - RV-8 - Right Wing Tip Installation A
(42).jpg><2009.06.28 - RV-8 - Left Wing Tip Installation
(39).jpg><2009.07.02 - RV-8 - Right Wing Tip Installation A
(40).jpg><2009.06.28 - RV-8 - Left Wing Tip Installation (42).jpg>
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koppk1
Joined: 11 Sep 2008
Posts: 7
Location: Jacksonville, FL
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| Posted: Mon Jul 13, 2009 4:24 am Post subject: Wing Tip Installation - Droopy Right... |
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Matt -
Same exact problem with mine as well. The left side was perfect without any fussing. The right side is about 3/8" low at the T/E corner. The two tips are certainly different (not just mirror images)...when I was making my lighting back plates I trimmed them to match the exact contour of the inside faces of the each tip. When I compare the left plates to the corresponding plates of the right tip they are significantly different shape and size...you cant notice this because you'll never be able to see both close together but it does make you wonder about the quality of the molds used to fabricate the tips.
I have not yet decided if I'll try to fix this or not. Aerodynamically it will be insignificant. Aesthetically, I doubt you will ever notice since on the ground the T/E is so low you'll never be able to see the line from flap-to-aileron-tip.
I thought about slitting the trailing edge but with all the holes drilled this isn't going to work. Something has to move.
Another options would be to fab an aluminum backing plate for the lower holes...realign the tip and redrill the lower holes through the backing plate...the #6 dimples are too small to worry about.. IMHO
Best of luck,
Ken
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