[ATM] Re:Tees instead of triangles

["Alan K. Henderson" <alankh@ev1.net>]

I've seen a few sites that say the front fan should blow across the top.
Where should the mirror be mounted, and how big a fan?

I've considered installing a baffle, similar to the one for this scope, that
blocks ambient light from behind the mirror. (See last two images.)

http://home.planet.nl/~asuyker/nvws/frames/my_ultralight_dobsonian.htm

Due to the mirror's quarter-inch beveled edge, I can attach the baffle
directly to the mirror without obstructing the reflecting surface. Will this
have any detrimental effect on the air flow from the two fans?

Should I consider a small fan to blow across the secondary? (The primary is
16" f/4; I calculate a 3.1" secondary.) Or will the breeze from the powerful
rear fan be strong enough to go up the length of the scope and disrupt the
secondary thermal layer?

Alan
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