They don't warm the air, so would probably accelerate cooling and exacerbate the dew/frost problem. On Nov 7, 2011 3:51 PM, "Kim" <kimharch@cut.net> wrote:
I've wondered if the 12-volt blowers for use in inflating airbeds and such (no heat) would work well?
-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Monday, November 07, 2011 2:53 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] NOT related to the Jupiter transit and GRS,Thurs Nov. 3 and Fri Nov. 5
Thanks, I think I'll get a little 12-volt model if I can't locate an inexpensive heating element. -- Joe
________________________________ From: Chuck Hards <chuck.hards@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Monday, November 7, 2011 2:37 PM Subject: Re: [Utah-astronomy] NOT related to the Jupiter transit and GRS, Thurs Nov. 3 and Fri Nov. 5
On 11/7/11, Joe Bauman <josephmbauman@yahoo.com> wrote:
What do our UA group members think about using a hair dryer? Would that work? (No comments about bald astronomers, now!) Thanks, Joe
If you can find a small, 12V blower (Harbor Freight sells one), it works well, you just have to keep doing it. Refractors and SCT's respond the best. Closed-tube Newtonians don't usually dew or frost up, though the secondary might if very close to the end of the tube.
Remember that you don't really want to heat up the optics, just get them warmer than the dew point. That's why the electric resistance-type dew chasers work so well, on so little current.
If you use a warm-air blower, the image will dance for a bit afterwards, but will settle-down for a while before you need to repeat.
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