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Yes, I purposely boxed in the problem. Knowing the tendencies of this
group to easily venture outside the box (cliche intended) I didn't want
this thread going wild. Sheez, pretty soon someone would have said,
"that's not the way Zoooom would have done it...". :)
I was leaning towards a simple spacer but was looking for a little
lighter solution that doesn't put the bolts in so much bending.
Preferably a solution made from aluminum that can be riveted to the
spar.
The 701 is built crazy light. I am amazed it actually can take the
loads though it only has a 1100# gross and is so slow that the gust
loads are minimal so that may be part of it. That and it's use of
.016 skins with huge skin panels that are purposely allowed to buckle.
Stan
veeduber@isp.com wrote:
> Dear Stan,
>
> I do not mean to be picky but your question is based on a host of
> assumptions -- the use of T-capped spar vs a C-channel, the aluminum
> itself, and so on. Having created that particular box the odds are
> overwhelming that existing solutions, such as two strut-attach straps
> installed upon the shear-web with spacers & thru-bolts will prove to be
> the most practical solution. Of course, then I've to define
> 'practical' :-) But given the venue in which you've broached the
> question a fair definition would seem to be 'practical' in the sense of
> a relatively inexperienced metalsmith fabricating a single copy of the
> design in a home-shop type of environment.
>
> Your chosen box also implies certain factors of cost and
> serial-production that might be considerably different for a home-built
> airplane.
>
> For solutions outside your particular box you will probably have to
> alter the box itself, such as considering a C-channel spar, or perhaps
> one fabricated with stock L-type extrusions for the caps. The Zenith
> CH-701 offers nice example of the latter in a design optimized for
> one-off production in a home-shop environment. In that case, the
> strut-attach fitting is little more than another, single, piece of
> extrusion attached upon a doubler on the forward face (ie, the
> unflanged side) of the shear web.
>
> I am sure that is not the answer you were hoping to hear :-) Please
> do not read it as a condemnation of your chosen design (ie, T-shaped
> extrusions, etc).
>
> -R.S.Hoover
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Re: clever ideas for a lightweight strut attach
