Wednesday, 1 June 2016

Part 2 of my "How dew you dew" action for the Free State Star Party 3 - 5 June 2016


How to fight the dew from the top?  Start a fan club.

Will it work? Maybe to much vibration?  Will find out soon.

Heatwaves in the tube? Is "bad seeing" not better than "no seeing" at all? 

 It is a small 60mm fan right behind the secondary mirror. I plan to add an on/off switch and a variable resistor to bring down the speed or turn it off if there is to much vibration.

Dew on the secondary mirror was a bigger problem then dew on the primary mirror,  during the previous star party (2015).

And the white wiring?  That is a nichrome heater (harvested from an old electric blanket)  to heat up the air a wee bit. Maybe some airflow (fan) will do the trick.

* Plan B is to  mount the fan on the edge of the scope tube and point it in the direction of the secondary mirror. What next?

Some links with more ideas

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