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Stan: I can send you photos of my Boelkow Jr 208C (certified A/C) . You
might be able to use the way the struts are attached. Also look up
MFI-9 ( very similar a/c).
Larry
Stan wrote:
> 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
