Quote:
Originally Posted by codemonkey
Vibrations from fans can definitely cause problems, the fan I added to the rear of my newt was causing blurred images and star elongation.
That said, I think you're definitely onto it here, Alex. I too made a dew shield out of corflute and adhesive felt and I was thinking about modding my newt to add a fan to protect the secondary from dewing. Adding heat to a secondary seems like a terrible idea to me, I'm not sure why so many people do it.
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I used a small scroll fan on my 10" f5 open strut Newt that I built about five years ago. It was a laptop type flat scroll fan that I bought off eBay for a few bucks. Attached it to a strut and aimed the airflow to blow across the surface of the secondary (not directly on it, just across it). I had a cheap PWM to drive it and kept it pretty low. It worked fine.
I used a second one as a primary boundary layer fan. Plenty of uses for those little scroll fans.