What is discribed below is nearly what I did to my 13.1" coulter last week. Removing of all the plastic pads and the plastic sheet that rides on those pads in...
2138
Pete Johnson
pjohnson3895
Dec 1, 2001 7:18 pm
All, The club ATM group has a large supply of Teflon in various shapes and sizes free to club members who can use it. I have the supply so let me know. Also,...
2139
Pete Johnson
pjohnson3895
Dec 1, 2001 10:26 pm
oops, I posted this to the wrong list..... sorry... Pete Johnson ... From: Pete Johnson To: bigdob@yahoogroups.com Sent: Saturday, December 01, 2001 2:24 PM ...
2140
GMYERS2@...
Dec 2, 2001 1:00 pm
for motorizing the scope (GOTO and/or Tracking) try www.RXDesignOnline.com...
2141
bigdob@yahoogroups.com
Dec 4, 2001 10:27 pm
Enter your vote today! A new poll has been created for the bigdob group: Who makes the best premium dob? o Obsession o Starmaster o Starsplitter o Mag1 o...
2142
jack755@...
jackl747
Dec 5, 2001 12:21 am
I'd like to hear your comments on the Star & Telescope article in the latest issue about using a fan to stabilize the heat coming off the surface of the...
2143
amateurastronomer
amateurastro...
Dec 5, 2001 1:58 am
INSTALLATION OF COOLING FANS As standard 12 volt cooling fans are too large to install inside the mirror cell assembly area, I chose CPU cooling fans for this...
2144
amateurastronomer
amateurastro...
Dec 5, 2001 2:02 am
The installation of cooling fans is from ART'S Starfinder Mods. Not Me! See the whole story here http://affy50.tripod.com/StarFind.html ... ...
2145
Tom & Lou Krajci
krajcit
Dec 5, 2001 2:25 pm
... I've done similar experimetns on my 10 inch sonotube dob, and 16 inch truss tube dob. I see essentially the same resutls in my experiments. One fan behind...
2146
Jan van Gastel
janvangastel
Dec 5, 2001 2:34 pm
Don't know if I answered this one already. But to be sure: I also have a fan blowing against the bottom and one blowing across the surface of my 20 inch...
2147
Jim Miller
jtmiller95746
Dec 5, 2001 3:53 pm
Jan Any ideas why the image would improve with the cross fan mirror off? It would seem that it would go from "improving" to "little effect" rather than...
2148
Neal Galt
nealgalt
Dec 6, 2001 12:47 am
I would think that once you stop the movement of air flow in front of the mirror the image would improve slightly.....referring, of course, to once you have...
2149
k9rx44
Dec 6, 2001 2:13 am
a bit frustrating....welll...maybe redeeming... I read the original article and it was clear to me that the REAL issue was the boundary layer! I speculated...
2150
Attilla Danko
attilladanko
Dec 6, 2001 3:30 am
My scope doesnt go "beep". But I put a temperature sensor on the back of my mirror and another waving in the air beside the mirror. Expeirence shows best...
2151
Attilla Danko
attilladanko
Dec 6, 2001 3:33 am
From: k9rx44 <GMYERS2@...> ... I, and perhaps others, would like to see a pic or a drawing of your ducting and fan arragement. -ad...
2152
Wayne Howell
waynehowell326
Dec 6, 2001 4:06 am
A good friend of mine has done extensive testing on this fan question.....he has sensors on his mirror to compare it to the ambient temperature, fans front and...
2153
Neal Galt
nealgalt
Dec 6, 2001 4:56 am
Nice discussion going on. I noticed at least twice that references were made to temperature sensors. However, there hasn't been any detail on that subject....
2154
Wayne Howell
waynehowell326
Dec 6, 2001 5:44 am
... Since I'm referring to my friend's setup on his Starmaster 20", I can't give you details such as make and model of his sensors, but..... He has a digital...
2155
Jan van Gastel
janvangastel
Dec 6, 2001 6:44 am
I don't know. Maybe airflow is good when the mirror temperature is more then, say 2 or 3 degrees above ambient and bad when the mirror temperature is about the...
2156
Doug Tanaka
dtanaka2001
Dec 6, 2001 8:26 am
... Jan, I was curious about your experience with images being better with the fan off (when the mirror has reached ambient temperature), because my experience...
2157
Doug Tanaka
dtanaka2001
Dec 6, 2001 8:26 am
... A circuit that may work can be found at <http://www.inetworld.net/clement/temp_control.html>. It is a design by ATMer Don Clement, originally designed for...
2158
Jan van Gastel
janvangastel
Dec 6, 2001 9:04 am
I can control the cfm my fans with a pot. I will do some more experimenting. Jan http://www.geocities.com/janvangastel/ ... From: Doug Tanaka...
2159
k9rx44
Dec 6, 2001 11:44 am
Hi Neal... I will get some pictures and post them (on the surface fans for my 30).... as for a sensor system - I have developed on and will manufacture and...
2160
Neal Galt
nealgalt
Dec 6, 2001 2:08 pm
Please keep us advised...photos and sensor system. Thanks..Neal ... ADVERTISEMENT...
2161
Neal Galt
nealgalt
Dec 6, 2001 2:09 pm
Thanks Doug.....will check this out. Most informative. Neal...
2162
Neal Galt
nealgalt
Dec 6, 2001 2:11 pm
Thanks for your input. In a rush this morning...will get back to group, hopefully, tonight. Neal ... ADVERTISEMENT...
2163
Tom & Lou Krajci
krajcit
Dec 6, 2001 2:29 pm
... See: http://ngc1514.com/Computer/tom.htm to see my sideways mounted fan. One of these days I'll probably cut vent holes on the opposite side of the ...
2164
randolf_flaguk
Dec 6, 2001 5:09 pm
hello all im am trying to get some information or baader turbofilm, it is used to close off newton tubes to help provent dust getting on to the mirror and...
2165
Frank Bov
frankbov
Dec 8, 2001 4:31 pm
As you can tell, there are two missions for fans in your telescope; cooling the thermal mass of the mirror and removing the residual thermal boundary layer at...
2166
agar81
Dec 8, 2001 5:19 pm
I have a 15" 2.0" thick primary that "suffered"; terribly from thermal problems until I installed 3 fans in the scope. I have two 26 cfm fans installed inside...
