Re: [ATM] New 16" telescope design

["RodShea" <RodShea@comcast.net>]

Alan,

Can you say more about the composite 1/2" plywood?   Do you know what it is 
made of, and its mechanical properties?

Also, I would echo Mark Holms thoughts on using Appleply or similar for the 
cell arms.  Solid wood of the same species will be approx twice as stiff as 
plywood parallel to the grain, since all of its fibers are in that 
direction, not half of them.  Aluminum would be better yet, and can be 
worked with woodworking power tools pretty easily.

Rod  Shea


----- Original Message ----- 
From: "Alan Scott" <alanne1956@hotmail.com>
To: <atm@atmlist.net>
Sent: Saturday, November 19, 2005 10:24 PM
Subject: [ATM] New 16" telescope design


>
> I have just finished the designs for an ultralight 16".  I am interested 
> in
> thoughts on the scope, and especially opinions on going with composite 
> 1/2"
> plywood, as opposed to 1/2" apple ply.  Theoretical weight for the plywood
> only is 62 lbs, and the composite comes out around 51.
>
> Thanks,
>
> Alan Scott
>
> http://www.xmission.com/~alanne/DS4Main.html
>
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