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You can try getting around the problem by getting a conical mirror put it in an open Truss tube and reach equilibrium with in 1/2hr without forced cooling.
When I made mine I was going to add forced cooling but R.Royce said it would not be needed , but I had to see for myself.
Needless to say i never did fit the fans on.
But I know what he's saying .
I have seen full thickness standrd mirrors never reach equilibrium even with forced cooling.
Hence thin mirrors , but then that has it's own design paremeters to contend with in proper plop mounting of the mirror.
Mark
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