In some cases the next smaller AN3 bolt is tooo short. Where 3 washers are
required, to get a good thread count, I generally put one washer under the
head.. two under the nut. Be careful in many places using a shorter bolt..
which will put part of the thread area of the bolt inside the grip area. Ie:
you could use one length shorter bolt to attach your gear struts, wing
attach fittings, etc.. but instead of having a nice toleranced smooth shank
of the bolt for the fitting to be retained by.. you will have a sloppy,
threaded area of the bolt instead.... that could cause fatigue/wear failure
if not just a sloppy attachment in general. I always shoot for the grip of
the bolt to be peeking out ever so slightly from the assembly in critical
attachments and washer it accordingly.
In cases of closed wings.. not much you can do about them lads other than
hope the majority are sound and not cracked. Just pointing this out for the
guys that can do something about it before you get stuff closed up.. and
didn't mean to throw anyone off with the FULL LENGTH OF THE WING
statement... I was trying to describe the fact that the builder of one
Rebel, that I was asked to travel and inspect, had bolted a 1/4" x 1" spar
cap to the ENTIRE length of the main spars upper flange (on one wing only).
Instead of the, I believe 42 or 44" length you are supposed to use from just
inside the 3rd bay of the fuel tank to out past the lift strut fitting. That
one I took the time to run by Darryl directly... as was concerned about the
extra rigidity of the spar !
Cheers,
Wayne
----- Original Message -----
From: "Bob Palmer" <
rtpalmer@shaw.ca>
To: <
rebel-builders@dcsol.com>
Sent: Wednesday, December 02, 2009 4:22 PM
Subject: Re: [rebel-builders] Rebel - Wing Spar Cap Bolts.
Keith,
I think you will find that those should be the next length shorter bolt
with one washer under the nut.
Bob.
Leitch wrote:
Well, maybe I did something right. My wing is not yet closed up and I
just looked...I have 3 washers on the nut end of the bolts with approx. 1
thread showing. Sorry to say I haven't been able to work on it for over a
year. :(
Keith R661
--- On Wed, 12/2/09, Wayne G. O'Shea <
oifa@irishfield.on.ca> wrote:
From: Wayne G. O'Shea <
oifa@irishfield.on.ca>
Subject: [rebel-builders] Rebel - Wing Spar Cap Bolts.
To: "Murphy Rebel Builders List" <
rebel-builders@dcsol.com>
Date: Wednesday, December 2, 2009, 12:08 PM
Not sure if anyone on the list is still in the wing build stage on their
Rebel... but if you are......I've been "inside" 7 wings since late
September
and every friggin one of them has the AN3 bolts "shouldered". These are
the
bolts that attach the 1/4" thick spar caps to the main spar. One wing,
out
of a pair, that I was in.. even had the spar backer bolted in this way
the
FULL length of the wing !!.. not just the three bays around the attach
strut.
The overlength bolt/threads showing is an oversight on MAM's part in the
manual and in their AN960-10 washer supply... but every one of these
bolts
needs an extra washer fellas so go buy a couple hundred now for $20. When
you can see 3+ threads showing on an AN3 bolt the nut is shouldered onto
the
grip of the bolt and it's not really tight..and possible that it's been
cracked from running out of thread.
The really sad part.. only two of these wings that I've inspected/worked
on
are USA built that can have an "excuse" with no preclose inspections
south
of our border.. but the Canadian ones.. should have been snagged before
they
got closed up this way!
That is all...
;O)
Wayne
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