Wing hold down

[Lance Van Nostrand]

Ed,
If you go with an internal nylon bolt, I advise not using it instead of a
forward adjuster.  In testing I've found that the large majority of the
aerodynamic lifting forces are on the wing between the tube and front
adjuster. You need the part of the wing between the tube and front adjuster
to never move.  if the bolt is used in place of a snug front adjuster, you
run the risk of it slipping in flight.
--Lance

----- 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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