KR> Wing Attach Fittings (et-al)

[Mac McConnell-Wood]

I had this discussion with our PFA engineers in UK, and they told me that
any unwanted blank holes in the spar should be plugged with a bolt shank.
The theory being that a wooden dowel could compress and weaken the spar..

Long time agooo!
Regards to all ,
Mac

On Tue, Jan 26, 2016 at 12:13 AM, Dave Acklam via KRnet <
krnet at list.krnet.org> wrote:

> Thanks for all the replies
>
> I now get what everyone means by 'shear joint', and that one should NOT
> weld anything unless you want to go through a whole hell-of-a-lot of extra
> work fixing the metallurgy of the resulting part.
>
> So far, the choices everyone has posted seem to boil down to:
>
> 1) Make new WAFs for one side using same-thickness strips of 4130, using
> the old ones as a template, then drill the main bolt-hole for the
> pin/attach-bolt based on where everything lines up.
>
> 2) Move the WAFs around on the spar, using dowels to plug the old bolt
> holes.
>
> My WAFs aren't really 'off' on the spar (both my old spar & my new wings
> are fully complete right now - the wings were slightly damaged in transit
> but nothing irreparable), and the holes appear to be the right diameter.
>
> So it would seem that making 'new ones' from strip steel would be the best
> choice, although I am open to more ideas.
> ___
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KR> Wing Attach Fittings (et-al)

[ml at n56ml.com]

KR> Wing Attach Fittings (et-al)

[Dave Acklam]

Thanks for all the replies

I now get what everyone means by 'shear joint', and that one should NOT
weld anything unless you want to go through a whole hell-of-a-lot of extra
work fixing the metallurgy of the resulting part.

So far, the choices everyone has posted seem to boil down to:

1) Make new WAFs for one side using same-thickness strips of 4130, using
the old ones as a template, then drill the main bolt-hole for the
pin/attach-bolt based on where everything lines up.

2) Move the WAFs around on the spar, using dowels to plug the old bolt
holes.

My WAFs aren't really 'off' on the spar (both my old spar & my new wings
are fully complete right now - the wings were slightly damaged in transit
but nothing irreparable), and the holes appear to be the right diameter.

So it would seem that making 'new ones' from strip steel would be the best
choice, although I am open to more ideas.