[ATM] Fifteen inch tube

[Francis J. O'Reilly]

Dave,

Cost is the issue, otherwise, I'd definately consider Carbon Fiber.

Francis
----- Original Message ----- 
From: "Dave McCarter" <dmccarter at sympatico.ca>
To: "Francis J. O'Reilly" <foreilly at bestweb.net>
Sent: Saturday, December 29, 2007 11:40 AM
Subject: RE: [ATM] Fifteen inch tube


>> I am at the figuring stage of my 12.5 inch f/7 mirror. I will
>> shortly be mounting the mirror in a telescope. I would like to
>> obtain a 15 inch aluminum tube approximatley 7 1/2 to eight feet
>> long. Does anyone have an idea as to who might sell such a tube?
> 
> I'm surprised that you don't want to go with carbon fiber tube, which is
> available. There would be very little contraction during an evening, so
> little refocusing, and the tube is much lighter than aluminium. A friend
> here in London, Ont. works at a place where they make large carbon fiber
> tubes for housing aeronautical instruments.
> 
> Dave
>