Re: Re: wing spars witc C grain at front?

From: William Gowen <wdgowen_at_gmail.com>
Date: Sat, 07 May 2011 12:09:15 -0400

The simple solution is to make spars both ways and do deflection tests
on them.

On 5/7/2011 12:05 PM, izgo wrote:
>
>
> Mark,
>
> That is why I ask. I also think there is not much difference based on
> orientation "at least for square section spars".
>
> But in wing spar usually we have a contsnt width (say 1mm) and a
> tapered front leading edge (say 2mm -> 1mm). so seems like all plans
> indicate A grain in front, leaving the c grain for the width.
>
> Im just asking to know reasons for that, or it is in this way because
> its "used to be" in this way for long time.
>
> Thanks for comments.
>
> Ignacio.
>
> --- In Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction%40yahoogroups.com>, "Mark F1diddler"
> <f1diddler_at_...> wrote:
> >
> >
> >
> > --- In Indoor_Construction_at_yahoogroups.com
> <mailto:Indoor_Construction%40yahoogroups.com>, "izgo" <izgo_at_> wrote:
> > >
> > >
> > > Hello
> > >
> > > why all use A grain for wing spars (C grain up and down) and not
> in C grain in the front. In this way looks more trong, as the way it
> works in ribs.
> > >
> > > thanks.
> > > Igancio
> > >
> >
> > If you're talking breaking or buckling point, I don't think it makes
> a difference which way the A/C is oriented, at least with spar sizes.
> I'm happy just to have a stiff, straight grained piece of A/C to use.
> Others will differ, I'm sure.
> > Mark F1diddler
> >
>
>
Received on Sat May 07 2011 - 09:09:33 CEST