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actionhac
professor emeritus
Reged: 08/09/08
Posts: 732
Loc: WA
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I have a 10"f9 full thickness mirror and a very heavy GEM that I will use.
Can someone save me time and point me in the right direction on the tube?
Would a Sonotube be ok? do they sell these 8ft. long? or fiberglass or a Hastings irrigation tube? or a truss type tube?
I want to put it on my GEM. I have a 10"f6 on it now and it handles it like it wasn't there and I must have tracking. I know I will need a longer ladder.
Just not sure what to use for such a long tube. I think my first choice would be the Hastings aluminum tube but It will be expensive.
I could build a tube similar to this:
http://www.frobenius.com/cave14.gif
Robert
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jg3
sage
Reged: 05/27/07
Posts: 329
Loc: near Auburn, CA
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Here's a split-truss design that should scale up well to yours:
http://rfroyce.com/newtonian8f8.htm
I roughly based my 12.5 f/6.3 on his previous version. It's very sturdy. This kind conveniently breaks down to a long but light unit plus a small but heavy unit, without having to assemble and disassemble all the poles and stuff.
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actionhac
professor emeritus
Reged: 08/09/08
Posts: 732
Loc: WA
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Not bad! thanks jg3!
I like this one, much simpler than the Cave design I have linked above.
I'm leaning towards a truss to keep cost and weight down.
Also I was given information on a off-axis Chief that looks interesting.
Robert
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