Quote:
Originally Posted by doug mc
I am thinking of insulating my 8inch dob ota. I found a material at Bunnings that is used as a car carpet. It is like a black felt with a firmer side that would go against the floor. I have used it as a dew shield. You can roll it and glue it into a tube for that purpose. It is light and would insulate quite well. A good idea?
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I'm not certain it would work for a Newtonian, as one end is open to the sky and thermal convention would be a problem as cold air "slides" down the tube regardless of the insulation.
In a cat, the corrector traps the air and therefore micro-convention occurs within the ota itself, with heat being radiated out the corrector and radially out the tube itself. Insulation can slow the radiation from the ota walls and since the tube is enclosed, currents are minimized.