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Date: Thu, 2 Sep 2004 09:49:59 -0700 (PDT)
From: John Overman <mooneydryver@yahoo.com>
Subject: Re: [FlyRotary] Re: foam-sicle (new ducts)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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--- Marvin Kaye <marv@lancaironline.net> wrote:

> "Russell Duffy" <13brv3@bellsouth.net> wrote:
> 
> 
> """
>   I just looked up the description of "bid" on the
> Spruce page, and can't say
>   that I can see any difference between that, and
> normal cloth (e-glass?).  I
>   cut the cloth on a 45, and usually have pretty
> good luck going around
>   corners, but I'm sure "bid" is probably better,
> and certainly my technique
>   could stand some improvement.  I'm using the
> lightest cloth I could find, at
>   6 oz, but wish it was a little lighter for the
> initial layers.
> """
> 
> The term "BID" simply stands for bi-directional, and
> defines the cloth as 
> being woven with warp & weave at 90 degrees to each
> other.  This is in 
> contrast to "uni" (unidirectional) type cloth in
> which just about all of the 
> threads run in one direction, with single threads at
> 90 degrees every several 
> inches just to keep the primary ones intact.  As for
> weights, you can find 
> much lighter fiberglass cloth at the local hobby
> shop, with material down into 
> the 1/2oz range.  For what you're doing, you would
> probably be well served 
> with some 2oz next to the mold, overlaid with
> several plies of 6 oz to add 
> strength to the exterior and the overall structure. 
> FWIW....
> 
>       <marv>
> 
While on this subject bid is #7725 uni is #7715 does
anyone know the designation for the cloth that the
Velocity factory calls "fine bid"? I know it is a 9oz
cloth while the standard bid is 8.9oz. Is it the
popular #7781?
                            John
                            Velocity turbo 13b 
                            Washington State


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