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Forfun3(at)aol.com
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 Posted: Tue Aug 29, 2006 6:15 pm Post subject: wing spars bend or wing warp? |
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I may be missing something, however is this describing the warp effect of the wing build process, model five wings have a wing warp built in by the process of setting up a jig while attaching ribs, if I am not mistaken?
Ralph
In a message dated 8/29/2006 9:06:00 P.M. Central Daylight Time, bnn(at)nethere.com writes:
| Quote: | --> Kitfox-List message posted by: Guy Buchanan <bnn(at)nethere.com>
At 04:14 PM 8/29/2006, you wrote:
| Quote: | I am the second owner of a 6 in which the previous owner did very little
constructionwise, and am at the point of attaching the wings. One of
wings fore spars has a bend on the vertical (perpendicular to the shear of
the insert). It is a continuous bend from end to end, and is 3/16" - 1/4"
at the apex. I carefully inspected the rivets and glue joints on that
spar and see nothing unusual.
Problem? Do I need to replace the spar?
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Since you're at the point of attaching the wings that means they're
assembled without strut fittings. It also means the bend must be vertical,
(which you state,) since a horizontal bend would be evident in both spars.
(The ribs should force the spars to be parallel, though it's certainly
possible they were installed with a bow in the forward spar.) However, a
vertical bend should be in the plane of the shear web of the insert, not
perpendicular to it. The shear web should be a vertical "I" beam. Some
clarification is required.
Given the bend is vertical, and about 3/16 - 1/4", you then have almost 1/2
degree twist in the wing just due to the bend. If so, you may be able to
trim the aircraft with the struts, but you're stall behavior will probably
be less than desirable. Not to mention your aircraft will look like crap to
the naked eye. (You'd be surprised how easy it is to see unnatural
deformations.) I vote replace the spar. (I'd bend it back if the shear web
weren't installed. There's too much of a risk of de-bonding the shear web
with it installed.)
Guy Buchanan
K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar. he es Day --> - NEW MATRONICS WEB FORUMS -
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cirrus10(at)qwest.net
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| Posted: Wed Aug 30, 2006 5:05 am Post subject: wing spars bend or wing warp? |
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Ralph,
If you mean washout, then no. The front spar, I believe should be straight. Thanks.
Regards,
Ed
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