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I've always maintained that my full thickness 12.5" Parks primary has trouble reaching ambient. I read Alan Adlers article on thermal management some time ago: using a fan/s blowing across the face of the primary to eliminate the boundary layer. But then I've often thought this would perhaps create another problem: tube currents. Plus the mirror would not actually be at thermal equilibrium.
You've obviously spent considerable time & effort researching this Bird! Well done.
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