Wing hold down

Thu Jan 15 09:39:29 AKST 2004

Keith:

I use a single adjuster and two bolts per wing panel.  Once the trim
adjustment is made for the adjuster, I put a 1/8" lite-ply disk, 1" dia.
over the holes where the bolts go.  The hole in the disk is just large
enough for the bolts to fit, so the bolts act as anti-rotation pins as well
and holding the wing on the fuse.  This is the way the PL kits are designed,
and it works very well.

Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
www.radiosouthrc.com
----- Original Message ----- 
From: "Keith Black" <tkeithb at comcast.net>
To: <discussion at nsrca.org>
Sent: Thursday, January 15, 2004 12:25 PM
Subject: Re: Wing hold down

> Bob's technique and experience is much like what I do.
>
> I use two adjusters per wing and would be uncomfortable doing otherwise.
You
> can't count on the nylon bolt to keep the wing from rotating since the
hole
> in the fuse ends up being larger than necessary to allow for incidence
> adjustment. Even if you tightened it down good it will still slip under
> force, and you don't want to get it too tight with a nylon bolt.
>
> >>1)  Will tightening the bolt put undue stress on the front 1/2 of wing
or
> > > will a washer eliminate this
>
> I reinforced the inside of the root rib with lite ply and a 3/16 square of
> aircraft ply for tapping to hold the screw. Then on the fuse I reinforced
> the inside with a 1/8" lite ply square to keep the head of the screw from
> pulling on the fiberglass wall, and to distribute the weight.
>
> Pictures:
> http://www.fototime.com/86170A44B86B557/standard.jpg
> http://www.fototime.com/59CE12BA35FD91F/standard.jpg
> http://www.fototime.com/72F598912096B5F/standard.jpg
>
> On my first Aries (the last two pics) I had to place the screw almost up
to
> the front wing adjuster to have clearance for the retracts and it does
> bother me somewhat that the front of the wing is more snug to the fuse
than
> the back. So on the second Aries, with fixed gear, I've moved the screw
back
> a little to help even the load, however I still wanted it to be forward of
> the tank because I want to have easy access.
>
> > >
> > > 2)  How long do the bolts need to be to keep from backing out, and is
> this
> > a possibility.
>
> Mine are about 1 1/4" long. I didn't want them too long because it's a
> hassle to screw them in, but also didn't want them too short in case they
> started backing out.
>
> I use 1/4-20 nylon bolts that I picked up the hardware store and cut them
to
> about 1 1/4".  I also purchased some aluminum 1/4-20 bolts that would work
> fine but I think the nylon ones are less likely to vibrate loose.
>
> Only once have I had a bolt loosen, luckily it didn't loosen enough to
allow
> the wing to slip off of the anti-rotation pin. So, in this one case it was
> good that the screw wasn't just *barely* long enough!
>
> > >
> > > 3)  Should the bolts be changed regularly to prevent fatique.
>
> I've wondered the same thing. After 135 flights they still look as good as
> new, but I do occasionally think about it. I try to always keep them away
> from fuel. I should probably change them once a season.
>
> Keith Black
>
> ----- Original Message ----- 
> From: "Bob Pastorello" <rcaerobob at cox.net>
> To: <discussion at nsrca.org>
> Sent: Thursday, January 15, 2004 5:19 AM
> Subject: Re: Wing hold down
>
>
> > 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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