I suppose that the bracing shown is equivalent to wings that have triangular bracing of the wing post and tissue tubes on the motor stick. The bracing stiffens the wing post to wing joint. As John mentions, this kind of bracing is helpful when launch torque is very high, like in a penny plane or F1D.
In the models I have flown, I have not had to launch with extremely high torque. Hence, my tissue tubes are just glued (with ambroid) without bracing to the wing spars.
Bracing may also be needed for models with long wing posts.
-Kang
--- In Indoor_Construction_at_yahoogroups.com, "John Kagan" <john_kagan@...> wrote:
>
> Yeah, like that :)
>
> I don't use them on the stab connections - just the wing, where there is more stress trying to twist the tissue tube off the spar.
>
> I doubt the brace would be required on an EZB (my EZB still has the posts on the wing).
>
> --- In Indoor_Construction_at_yahoogroups.com, "Yuan Kang Lee" <ykleetx@> wrote:
> >
> > Here a picture showing the triangular bracing of the tissue tube
> >
> > https://picasaweb.google.com/jeffrey.hood/LakehurstLaborDay09TeamSelectionFinals#5384301752092626370
> >
> > Thanks to Leo who pointed this out to me.
> >
> > -Kang
> >
> > --- In Indoor_Construction_at_yahoogroups.com, "Yuan Kang Lee" <ykleetx@> wrote:
> > >
> > > John,
> > >
> > > Do you have a picture of the triangulation piece? I think I understand what you wrote, and a picture would really make it clear.
> > >
> > >
> > > On my EZB and F1L, I use ambroid to attach the tissue tube to the wing spar. The joint seems strong enough for these models.
> > >
> > > -Kang
> > >
> > > --- In Indoor_Construction_at_yahoogroups.com, "John Kagan" <john_kagan@> wrote:
> > > >
> > > > > Are the posts then glued directly to the motor stick ?
> > > >
> > > > Yes. My LPP posts are glued to the side of the solid motorstick, my F1D posts are glued in holes drilled in the motorstick tube.
> > > >
> > > > >How do you get a decent glue joint of the tissue tubes to the wing spars (I assume they have to be ahead and behind the spars to allow incidence adjustments) ?
> > > >
> > > > I've found that it is important to put a little "triangulation" piece connecting the bottom of the tissue tube to the spar (so there are three points of contact: tissue tube to wing spar, tissue tube to trangulation piece, triangulation piece to wing spar).
> > > >
> > > > Without it, the tube flexes and the glue joint is weak.
> > > >
> > >
> >
>
Received on Mon Jun 13 2011 - 17:51:52 CEST