8" f6 dob
400mm f/4.46 self made Dobsonian on Tom Osypowski equatorial platform Skywatcher 130mm f/5 BlackLine (finder, widefield scope and solar continuum scope) Sumerian 250mm f/4.8 Alkaid (as travelscope without platform and on Tom O. platform above).
Quote: Don't mean to knit-pick here...
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote:Don't mean to knit-pick here but there is no removing a fluid boundary layer.
Quote:Hi Sixela,I just read your 2010 post. Do you recommend to use the fan the other way round to pull air?
Quote:Hi everyone. Thought I'd chime in here with a related question. I saw a similar discussion earlier this year (on this CN forum I think) in which fans were mentioned that have a very good score for minimum vibration, and I wonder if anyone knows what make those are or can recall that post. I was pretty new to CN then and forgot to bookmark it.
Indiana for a three more weeks...
14.5" Teeter w/ Richard Fagin mirror, TT #66
EON 120ED on CG-5 ASGT
Lunt LS60THa/B1200 Sky Guy Porta II
Denk Super System with A45 OCS
Quote:If it is strong enough. Most computer fans are not.I bought an "outrunner" motor used for radio-control airplanes andmounted it behind my mirror cell with a 9" APC pusher prop. I run it at 10000 RPM. Gets rid of every trace of tube currents and boundary layer. The only problem is you have to be careful getting your hand close to it, because the prop can take a nice chunk out of your finger. Collimate *before* turning on the fan.
Home-built Newt: 10" f/4.5 Royce conical primary, Skywatcher NEQ6 (Astrotroniks tuned) iEQ45, Duo-T, 8" f/4 Skywatcher Quattro CF 120 ED f/7.5 Skywatcher Black Diamond 80ED Stellarvue
Quote:... I saw a similar discussion earlier this year (on this CN forum I think) in which fans were mentioned that have a very good score for minimum vibration, and I wonder if anyone knows what make those are.....
WO Megrez 120 ED on GP Mount
WO ZenithStar 80 ED II on Porta II
10" Meade LightBridge/Paracorr
Orion ED 100 on Polaris Mount
Astro-Tech 8" f6 Dob
Bushnell Ares 5
Meade 226 2.4" f11.7
SpaceScope 2.4" f15
Quote:If you want you can watch these Youtube video's I posted 2 years ago with my 10" Lightbridge
-DannyMy warehouseMy Channel
Quote:Kept watching hoping to see what the fan did by pulling the air off by turning the fan around.
Quote:Don't mean to knit-pick here...
Quote: There is no k in nit...
Quote: You should only use a fan to help the scope quickly acclimate to the point where natural convection isn't noticeable or minimized. Once its near the temperature of the surrounding environment you should turn the fan off. Having air blow through the scope will only worsen its performance and the vibrations from the fan aren't going to help either.
Quote: Once its near the temperature of the surrounding environment you should turn the fan off.
Quote: ...then its merelly blowing thermally homogeneous air which shouldnt carry any turbulent effects at all.
Quote: "I got here the same way the coin did" - Anton Chigur
Quote: Mike, in all fairness the coin I tossed in the stream got eaten by a trout
Quote: I've not ever had the west coast semi coastal weather patterns...
Quote:I'm resigned to the fact that I will NEVER look at an out of focus star and not see some boiling .
I'd rather be driving my .
Tristan McMannis Modified Orion Skyquest XT8 w/ Parks Primary Apertura AD12 w/ Waite Research Mirror Celestron 15x70 Binos & Bushnell 10x50 Binos