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What that article I posted the link to needs is a picture.
Here's what I've done with my solid tube 8" f/4 Newt. The primary cell is custom made. It totally closes off the rear except for a hole in the centre, where a fan draws air OUT of the tube, NOT blow onto the primary.
The article explains the principle and how the airflow works to cool the primary more efficiently and evenly, eliminate tube currents, and keep it dry.
Alex.
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