Jerry Hyman
super member
Reged: 03/29/07
Posts: 118
Loc: Mesa, Arizona
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I am planning to build my own Newt using a conical mirror. Can anyone who has tried building a solid tube newt with a conical mirror give me the pros and cons of fan and exhaust placement?
Thanks!
~jerry
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9.25" Celestron carbon fiber SCT
Vixen Super Polaris Deluxe mount
Vixen Super Polaris mount
Burgess BV24 Binos
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spaceghost
super member
Reged: 01/04/07
Posts: 139
Loc: Olathe, KS
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Hi Jerry!
I built a 12.5" solid-tube newtonian with a Royce conical mirror. I put three 10 cm computer fans on the back, blowing up the tube. Seems to work great, I'm curious to see how well I do when it gets colder at night. The board the fans are on has three velcro patches that stick to three blocks with velcro I glued to my mirror mount.
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Justin
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spaceghost
super member
Reged: 01/04/07
Posts: 139
Loc: Olathe, KS
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meant to attach a picture and it disappeared, try again.
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Justin
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Chimaera
member
Reged: 09/09/07
Posts: 37
Loc: Toronto, Canada
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I built a 8in f6 reflector with Royce conical mirror and Protostar Blacklight tube. The back of the tube is closed with a resin "camping" plate with a hole sawn for a fan blowing up the tube. The back plate is isolated from the tube with a strip of insulation foam and held in place with elastic hair braids. Fan speed controlled with pot. Works great. 8in Royce conical mirror does not have a lot of mass. Reaches ambient temperature very quickly.
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Chimaera
member
Reged: 09/09/07
Posts: 37
Loc: Toronto, Canada
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Picture with back plate on.
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Jeff Morgan
Carpal Tunnel
Reged: 09/28/03
Posts: 1512
Loc: Prescott, AZ
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Being in the desert I have 30-35 degrees of nightly temperature drop to contend with. I have gone to using a 12" household fan placed behind my scope blowing air into the rear of the mirror box, low setting. Works well, and as you might expect zero issues with vibration.
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Jeff Morgan
Prescott, AZ
Wile E. Coyote School of Telescope Making
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Roy McCoy
professor emeritus
Reged: 10/13/05
Posts: 601
Loc: Glendale, AZ
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Jeff,
How have you attached the fan? Did you screw it directly or did you use rubber bands or bushings?
Roy
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Jeff Morgan
Carpal Tunnel
Reged: 09/28/03
Posts: 1512
Loc: Prescott, AZ
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Not attached in any fashion. A normal house fan sitting on the ground about six inches behind the mirror box.
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Jeff Morgan
Prescott, AZ
Wile E. Coyote School of Telescope Making
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Roy McCoy
professor emeritus
Reged: 10/13/05
Posts: 601
Loc: Glendale, AZ
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Oh my goodness, I read right past that in your post above.
Thanks Jeff,
Roy
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rboe
Numbfinger
Reged: 03/16/02
Posts: 39501
Loc: Phx, AZ
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I've resorted to the same thing with my dob in the backyard (where AC current is available) on some nights (tonight would be a nice exception). Lot's of flow.
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Ron
NS11GPS
Pronto
16" dob
15X70 Obies
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