Re: ATM Ultra-lite Dobs using foam core components

["at making" <atmaking@hotmail.com>]

>I once calculated the weights for a scope made with
>foam-laminated-with-doorskins versus one made with 7/16" thick solid ply.  
>I
>was surprised at how close the numbers were.  Iit didn't seem like all the
>extra laminating work would be worthwhile.  Admittedly I assumed a
>"traditional" Dob form factor -- to make sense out a foam scope, you would
>have to have to engineer something that really exploited the lightweight
>possibilities, rather than just cloning some old design.

The weight is not the only goal, the ratio weight/rigidity is much better. 
To really compare both design, it could be intresting to know the weight of 
a scope as rigid as with a foam core.

Frédéric Géa
http://www.astrosurf.com/altaz

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