From: hermit 
CC: atm{at}shore.net
Reply-To: hermit 


Dave wrote:
>
> Has anyone used a 2 piece tube for a DOB ( the tube is made from two lengths
> of sonotube that slip together using a nested length of sonotube).
>
> I want to build a standard DOB, but the tube length is too long to fit in my
> car.
>
> I tried to find something like this in the archive, but didn't have any
> luck.
>

Why stay with a solid tube then?  Most people would think truss at that
point.  Your design will get more difficult as the size increases.  Tube
stiffness, or sag, will affect collimation.  Even if it is a smaller tube,
be prepared to recollimate every time you set up.

Just throwing these out for you to consider.  Please, no flames on how I am
trying to stiffle inovation.  The truss design was an inovation to solve
the need for cutting the tube in two. ;-)  It become a question of making
something work when there may be a better, easier solution at hand.

x

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