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Originally Posted by asimov
Iv'e always wanted to follow Alan A's advice and cut a hole in the side of the tube & mount the fan blowing across the mirror & out the other side, but I'm not game!
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I drilled a 6mm hole through the side to feed in an air hose but I haven't finished the job so not sure if it will work but I am pretty hopefull.
I have used 6mm silicon air hose with holes drilled every 25mm and connected this to a 12V live bait pump. I have test run it in the garage and it definately gets a little air flowing across the telescope tube about 10mm above the primary which should be all it needs. Once I have tested it and make sure it works how I want it to I will post some pics of the whole setup showing how the hose runs around 50% of the circumference of the tube and is fitted to little clips on the bottom of my primary mirror baffle.
CS-John B