Wing hold down

[Bob Pastorello]

I've used this method many years, when access to a bolt head wasn't a
problem.  I've always used the cheap Dubro black nylon bolts, cut to length.
My method is to put a 1/2" hardwood dowel, about 1/2" long, epoxied to the
back side of the ply root rib.  Usually, I'll locate this as close (in front
or in back) of the wing tube area.  Drill and tap for the 1/4-20 bolt, push
wing on, mark inside of fuse, drill hole.
    If the fuse side is flexing a great deal, I just put a 1/16" ply disc
about 3/4" diameter, glued to the inside of the fuse.  Center drill as
needed, and enlarge if incidence changes.  It also provides a good surface
for the underside of the bolt head to grab.
    Properly snugged, they never loosened, at least in my experience.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: "Ed Deaver" <divesplat1 at msn.com>
To: <discussion at nsrca.org>
Sent: Wednesday, January 14, 2004 11:13 PM
Subject: Wing hold down


> Hey everyone.  Have always used the bolt in the wing drilled through the
> tube.  Have decided to go with a 1/4" nylon bolt through the fuse into
> tapped dowel.  Only using one wing adjuster aft, with a vertical slot in
> this hole so bolt will be tightened down with wings adjusted.
>
> 1)  Will tightening the bolt put undu stress on the front 1/2 of wing or
> will a washer eliminate this
>
> 2)  How long do the bolts need to be to keep from backing out, and is this
a
> possibility.
>
> 3)  Should the bolts be changed regularly to prevent fatique.
>
> Am not interested in rubber band, wire ties ect.
>
> thanx in advance.
>
> ed
>
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