Wing hold down - falsifies

Thu Jan 15 12:11:39 AKST 2004

I think you may find what you're looking for at Lowe's automotive hardware
section.  Maybe the clips for body panels??

Keith L. Hoard
Cordova, TN
khoard at midsouth.rr.com

----- Original Message ----- 
From: "Jeff Hughes" <jhughes at hsonline.net>
To: <discussion at nsrca.org>; <discussion at nsrca.org>
Sent: Thursday, January 15, 2004 2:50 PM
Subject: Re: Wing hold down - falsifies

>
> What somebody needs to design is spring loaded clip thats like a dowel
> with tapered "wings" that's permanently glued to the wing panel and
> squeezes and "pops" open when inserted through the fuselage sides.
> Then  you have to squeeze it to release the wing to go home. That way
> if there is no gap between the wing and fuse, you know its clipped on.
> plus there's no extra hardware to keep track of. I'll let any body
> build and sell these for a slight royalty!
>
>
> > Eric:
> >
> > Not a bad idea...I think we have all seen too many wings come off
> due to
> > forgetting a bolt somewhere.....
> >
> > Tony Stillman
> > Radio South
> > 3702 N. Pace Blvd.
> > Pensacola, FL 32505
> > 1-800-962-7802
> > www.radiosouthrc.com
> > ----- Original Message ----- 
> > From: "Henderson,Eric" <Eric.Henderson at gartner.com>
> > To: <discussion at nsrca.org>
> > Sent: Thursday, January 15, 2004 1:14 PM
> > Subject: RE: Wing hold down - falsifies
> >
> >
> > I was just going to reply when I saw Tony's note. I do like the idea
> of
> > locking the wing with 1/4 x 20 nylon bolts, especially  in one of
> the wing
> > adjusters. A doughnut of lite-ply would take care of the up and down
> slop.
> >
> > My current preference is to put the adjusters in the wing panels.
> This
> > allows the usual 4-40 $4000-screw in the wing and also the use of RC
> > car-body style clips through the protruding adjusters inside of the
> > fuselage.
> >
> > E.
> >
> > -----Original Message-----
> > From: discussion-request at nsrca.org
> > [mailto:discussion-request at nsrca.org]On Behalf Of Keith Black
> > Sent: Thursday, January 15, 2004 1:25 PM
> > To: discussion at nsrca.org
> > 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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