Re: wing spars witc C grain at front?

From: izgo <izgo_at_yahoo.com>
Date: Sat, 07 May 2011 17:06:12 -0000

Obill,

You are complete right. Actually this is how is done, alwais testing before using.

By asking if there is a particular reason, I learn, I save time and balsa, hard to find the good one. Also, sometimes you look for some special beheaviour, for example flare props...

so, the question still goes.. Why its indicated A grain fro wing spars in almost al F1D plans?


--- In Indoor_Construction_at_yahoogroups.com, William Gowen <wdgowen@...> wrote:
>
> What's important to me is that if you have 2 sheets of wood that look good
> for making the spars you need you can cut spars from both sheets and then
> test them to see which works best for your purpose. This doesn't answer your
> question about which grain pattern is best but it will answer the question
> of which spar is best.
>
> This is similar to what I was trying to say about multi-strand motors. I
> think the number of strands of rubber is not as important as the performance
> of the individual motor. A 3 or 4 strand motor may perform better or worse
> than a 2 strand motor made from the same rubber. A C grain spar may perform
> better or worse than an A grain spar even if they're from the same piece of
> wood.
>
> Testing will tell you which is best in either of those situations.
>
> On Sat, May 7, 2011 at 12:31 PM, izgo <izgo_at_...> wrote:
>
> >
> >
> >
> > William,
> >
> > Its not so easy because for a tapered wing spar I need to cut them from
> > different wood sheets, Or use a think one so you can cut from both
> > directions.
> >
> > Hard but not impossible, but i thought maybe all this was already tested
> > and there is a simple reaon to prefer one orientation and not the other.
> >
> >
> > --- William Gowen <wdgowen_at_> wrote:
> > >
> > > The simple solution is to make spars both ways and do deflection tests
> > > on them.
> > >
> >
> >
> >
>
Received on Sat May 07 2011 - 10:06:18 CEST