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Thanks for the answers. I will try to make some tests on the P/E bumper to see how it's getting along with the paint. It's strange nobody heard about it. I checked again and it says <P/E> on it.

Hello, everybody. Can anyone help me understand what are the differences between PE and P/E? I cannot find any info on P/E. Is it the same thing as PE? I am asking this because I have two identical car bumpers, one marked with PE (which I know very well) and the other with P/E and I would like...

I managed to finish the test tube made from aluminized glass fiber. I used a carboard tube(sonotube) as a mandrel. After I wrapped it in nylon foil, I wrapped the fabric two times around the mandrel, then I wrapped some peel-ply very tight around and then I put another nylon foil around. After...

Thanks, I will try this too and see what I get.

Thanks for the tips. The most important thing for the tube is that it will not bend with the temperature variation. If it does, the telescope looses collimation (allignment of the optical axis) and it must be collimated again and again. If the tube length or diameter vary with the temperature...

Most of the materials I use come from http://shop.r-g.de/en/home/, but I have also used some from http://www.fibreglast.com/. Of course, there are many others.

I don't use prepreg, though there are some vendors. The rest I buy it from online specialized shops (I'm not sure I am allowed to post links to their sites) or from local composites distributors.

Thanks for the answer. I will make some tests with the male mandrel method. Then I will see where I go from there. After wrapping the fabric, the ends of the fabric must be one above each other? I am thinking if they aren't, the tube doesn't have the same thickness all around.

Thanks for the quick replies. The tube doesn't have any taper, it's a constant thickness cylinder. When I was refering to dimensional stability, I was thinking thermal stability, between -15*C and 30*C. I don't want the tube to bend or twist with the temperature variation. I cannot use...

Hello, everybody. I am planning to build myself a 80mm refractor telescope and I want to make the tube from carbon fiber composite. What type of lay-up should I use for the composite for maximum dimensional stability? I did't find a clear answer searching in the composite books that I own, so...