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Well, Canberra has extreme swings between day and night, usually around 15 degrees or more, so thermal issues are exaggerated here. But I tried fans and they didn't make enough difference for it to be worthwhile - as you say it was only stirring up the warm air and not really solving the real problem - the primary was too hot.
If you can cool the primary properly then you can switch off all the fans etc, let the air settle down in the tube so it's all stationary and you'll get fabulous views :-)
Bird
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