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if im correct in thinking upto the 8" varients uses BK-7 glass which will take about 30min - 1hr to cool down, but the 10" uses pyrex, which really doesn't do anything so it doesn't need to "cool down" though the tube and other components need to be at approximate ambient temperature.
To see these effects even in your telescope set it up, put it on a nice bright star, then defocus the star till it nearly covers your field of view. Put your hand infront of the telescope you will see the heat coming off your hand. you can use this method to see tube currents and if your optics are "cooled"
So do i believe in fans? No, they introduce vibrations and in a open newt design will only serve a small bonus.
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