Re: [ATM] Cost effective tubes for truss scope

["Marco" <marco.pm@btopenworld.com>]

I've used balsa/fibreglass/resin composite for truss tubes on
my scope. It's a 8.75in Dob at 5KG all in. The stuff to make
the trusses cost very little.

My ultralight scope and MK2 truss design  are at the folowing web page.
The trusses weigh 60g and are1m Long and quite stiff, longitudinally, in
compression/tension, axially and in bending.

Beware however the time it takes to make the trusses.

www.geocities.com/telescopiman



----- Original Message -----
From: Jerry B. Hillman <JBHillman@ev1.net>
To: The Amateur Telescope Makers List <atm@atmlist.net>
Sent: Wednesday, June 23, 2004 12:24 AM
Subject: [ATM] Cost effective tubes for truss scope


> Hi all,
> I am going to rebuild both of my scopes to make them lighter.  Much
lighter.
> I need to get them down in weight so that I have the option of mounting
them
> on a EQ platform.  Currently my 10" is in a sonotube and the 16.5" is
using
> steel electrical conduit for trusses.  Both are too heavy. The steel
conduit
> is rock solid, but makes the scope weigh about 30 pounds without the
mirror.
> Any recommendations for lighter, affordable tubes would be appreciated.
> And on another subject -
> Would anyone with a 16" scope care to share some observations with me?
Mine
> is a 16.5" F4.5. I would like to compare notes and see if my 16.5" is up
to
> par.
> Respond off list please for the observation question.
> Clear skies, Jerry
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/

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