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n8vim(at)arrl.net
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 Posted: Sun May 20, 2007 10:30 am Post subject: Aligning Fiberglass Wingtips |
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When you work on the fiberglass wingtips, how do you get it aligned
correctly so that the aft end of the tips are even with the ailerons
when everything is installed?
I can see where a slight misalignment would cause the aft end to vary
quite a bit.
How did you do it? Any other suggestions on how to do the wingtips would
be appreciated!
-Jim 40384 (Waiting out the monsoon to work on the tips outside the house)
As a side question: Why fiberglass? Why not injection molded plastic? It
would cost less and be more precise for non-structural parts... Hmmm.....?
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bgill1(at)charter.net
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| Posted: Sun May 20, 2007 10:49 am Post subject: Aligning Fiberglass Wingtips |
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Hi Jim:
I just went through the same issue last month. The first wing tip went
on great no issues. The second one - after getting it all #40 drilled -
was off by 1/4" at the tip. After scratching my head a day or two and
fretting about the postings from guys that had to slit the tips and
re-fiberglass...I undid everything and found that if I wiggled the tip a
bit on the top side and got it sitting a bit better in the wing, the
1/4" was gone...
Long story short, it is definitely easy to get the movement that you
mentioned. After glassing up the holes on the one side, I made sure that
the flaps and aileron were in proper alignment and taped the aft edge in
place and made sure that there was no movement as I #40 drilled the
holes up from the leading edge. This time it aligned up fine. Just make
sure that you can make it fit straight before drilling and then
alternate concave to convex side and cleko every hole as you go to the
trailing side. Look often as you go to make sure that there is no
movement and that fiberglass doesn't build up between the wing and tip.
Hopefully everything will align up fine.
Byron - N253RV assigned (beginning year two of finishing and firewall
forward)
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Tim Olson
Joined: 25 Jan 2007
Posts: 2872
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| Posted: Sun May 20, 2007 12:00 pm Post subject: Aligning Fiberglass Wingtips |
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I left it in the wing cradle, hooked up the flaps and ailerons, aligned
the aileron to the flap when the flap was full-up, and then made
the wingtip match. One thing that you will want to do is to (picture
this as if your wing is in a cradle leading edge down) push DOWN on
the trailing edge, and when you push it down tight, the wingtip will
expand itself into place to match the curve of the wing. Then while
holding pressure, have someone drill and cleco the holes. That way you
get the holes all drilled with the trailing edge lined up, and the tip
is expanded all over to fit the wing contour. That should make it
come out ok.
Don't know why, on the plastic, except cutting and molding some of the
other mods in would be easier in glass I guess.
Tim Olson - RV-10 N104CD - Flying
do not archive
James Hein wrote:
| Quote: |
When you work on the fiberglass wingtips, how do you get it aligned
correctly so that the aft end of the tips are even with the ailerons
when everything is installed?
I can see where a slight misalignment would cause the aft end to vary
quite a bit.
How did you do it? Any other suggestions on how to do the wingtips would
be appreciated!
-Jim 40384 (Waiting out the monsoon to work on the tips outside the house)
As a side question: Why fiberglass? Why not injection molded plastic? It
would cost less and be more precise for non-structural parts... Hmmm.....?
|
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n223rv(at)wolflakeairport
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| Posted: Sun May 20, 2007 2:51 pm Post subject: Aligning Fiberglass Wingtips |
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I waited until the wings were mounted. Set the flaps, then set the ailerons to the flaps. Last align the wing tips to the ailerons and drill.
-Mike
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jwt(at)roadmapscoaching.c
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| Posted: Sun May 20, 2007 3:23 pm Post subject: Aligning Fiberglass Wingtips |
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Jim,
My thoughts on this:
Before drilling the attach holes clamp the trailing edge of the wingtips to
the aileron using a long straight edge. This helped me to get the alignment
pretty close. I then still had to slit the trailing edges of the wingtips
and re-epoxy them while clamped in alignment. Mine were also too long and
had to be trimmed about 1/2". Contact me offline if you want to discuss
more.
John Testement
jwt(at)roadmapscoaching.com
40321
Richmond, VA
Paint prep and LOTS of misc stuff
do not archive
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pitts_pilot(at)bellsouth.
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| Posted: Sun May 20, 2007 6:01 pm Post subject: Aligning Fiberglass Wingtips |
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James Hein wrote:
| Quote: |
When you work on the fiberglass wingtips, how do you get it aligned
correctly so that the aft end of the tips are even with the ailerons
when everything is installed?
I can see where a slight misalignment would cause the aft end to vary
quite a bit.
How did you do it? Any other suggestions on how to do the wingtips
would be appreciated!
-Jim 40384 (Waiting out the monsoon to work on the tips outside the
house)
As a side question: Why fiberglass? Why not injection molded plastic?
It would cost less and be more precise for non-structural parts...
Hmmm.....?
|
I'm just going to guess that the cost of a large mold for injection
molding would make the recovered cost per part too high. fiberglas
molds are terribly cheap to make.
Linn
do not archive
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DAVELEIKAM(at)wi.rr.com
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| Posted: Sun May 20, 2007 6:50 pm Post subject: Aligning Fiberglass Wingtips |
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Can you use epoxy resin or another product to repair or modify plastic the
same as fiberglass? Can you finish and paint plastic as easy as fiberglass?
And is plastic affected by heat and cold differently than fiberglass? Just
wondering.
Dave Leikam
40496
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pitts_pilot(at)bellsouth.
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| Posted: Sun May 20, 2007 7:07 pm Post subject: Aligning Fiberglass Wingtips |
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Dave Leikam wrote:
| Quote: |
Can you use epoxy resin or another product to repair or modify plastic
the same as fiberglass?
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Not really. Most of the aviation plastic is ABS. However, I've
successfully patched ABS plastic by disolving the plastic from a defunct
computer keyboard in MEK.
| Quote: | Can you finish and paint plastic as easy as fiberglass?
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Yes. You can find spray cans in most good hardware stores.
| Quote: | And is plastic affected by heat and cold differently than fiberglass?
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Oh yeah! The plasticiser in ABS will boil off over time and the plastic
will become brittle and crack. It will also deform with elevated
temps. Fiberglas typically doesn't get brittle with age and it'll
withstand much higher temps. Epoxy resins are significantly better
performing than the old polyester resin .... but they're also more
expensive.
Linn
do not archive
[quote] Just wondering.
Dave Leikam
40496
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