cooling fan project advice needed.

[girko]

:help:Hi fellow Amature Astronomers i need thought's and plan's on
mirror cooling fans. I have a Meade LXD 75 10", so would this be
an advantage as the OTA is closed at both ends.

[I.C.D]

Girko,
I made my cooling fan from 2 pieces of stainless pipe 1x 32mm 1 x 25 mm two washers and 12 volt 40mm CPU fan

Welded the washer to the pipe then screwed the fan to the 32mm end so the fan sucks the air from the tube pass the primary mirror.I will take some pic when I get home tonight and send them to you. I have LXD 75 8”

[Ian Robinson]

If it's a sealed OTA , then there should be little thermal turbulence cf an open ended OTA where the warm mirror and cell will drive convection and make the air in the tube turbulent near the mirror.

Unless the air temp differential between the inside and out of the tube in your case is high , I would think forced cooling of the tube internals is not worth it.

My 5c.

[girko]

Thank's for the info Guy's

Cheers Girko .:thumbsup: