10" F/4.7 Modified Skywatcher Reflector, 38mm Orion Q70, 17mm Modified Ultima LX, 10mm TeleVue Delos, 7mm Pentax XL.
SyedTeeter STS 11 f/4.3 Zambuto | XT8i | XT8g | XLT 150 | C90 | EON 80mmAT Voyager and Nexstar SLT mountsEyepieces: Mostly TeleVue and PentaxDenk II BV'er, Earthwin PFS-SE, Pentax 10x50 PCF WP II
Frank Hot-rodded 10" Orion Dob, 31mm Nag 13 & 6mm Ethos a few cigars and a comfy chair.
Quote:All those exposed wires and components make me nervous- I'd probably kick it or get tangled in it somehow- ever think of creating some kind of small protective cover? Might get in the way of the bearing...
Quote:Thanks Bob, this thread has definitely inspired me to try out some new thermal solutions. Yours is a work of art!
On my 15" - I think the baffle on the top of the Obsession box acts somewhat as a di Lio baffle, at least in the sense that I feel it is creating a very laminar air flow around the mirror. It's about 9" above the mirror but I think it helps. The important variable that I have recently changed is the flow of the fan, from blowing on the back of the mirror to exhausting air from the box. I have also coupled this with closing up the back of my mirror box with Protostar flockboard, a kydex-like material.
The Flockboard is also flexible and (very important!) I have formed it into a scoop top and bottom (see photo) which helps pulls air from around the mirror.
The theory here is that an exhaust fan can gently pull the air from around the mirror, whereas a blowing fan cools the mirror faster but just creates turbulence in the box.
A small scrub fan placed above the mirror like yours Bob, is the obvious next step, along with a di Lio baffle - but meanwhile with the results I had last night I'll wait -...
Truss dob exhaust fans, unite!
Meade 16" f/4.5 Lightbridge M42 w/Paracorr & "Crossbow" EQT-200 Equatorial Platform
Meade AR-6 w/10:1 Dual Speed Crayford Focuser
Meade ETX-125 Terabeam/Wegat
Orion ST80 w/single speed Crayford Focuser
CGEM Hypertuned by Deep Space Products
.......Curtis MallinCam Extreme 2 + AT8IN + CGEM + Miloslick = WOW WO Binoviewers + Siebert OCA 1.25x-3.5x 10" OPT Starhunter (flocked & upgraded focuser) Celestron FirstScope 10x50 & 15x70 Celestron Bino's 2" 2x GSO Barlow
Quote:That's awesome, do you plan on broadcasting on NSN?
David Cotterell Toronto, Ontario "If an observer actually sees an object, there is no point in referring to a formula to find out whether he ought to see it; and if he fails to detect it, no formula will ensure his success." - W.H. Steavenson 8" f/15.5 TEC Maksutov - 16" f/5 Teeter/Zambuto Dob - TEC 140 - AT 65EDQ APO Refractor - Astro-Physics Mach 1 GTO Mount - iOptron ZEQ25 mount - Discmount DM6 - Canon 60Da
-DannyMy warehouseMy Channel
Happy owner of--
A Mag 1, 12.5 inch Porta Ball
A Dual Axis Equatorial Platform
A PST Double Stack
Quote:Dave,if you want to stay within the secondary shadow with the fan it has to be smaller than your 2.12" as the shadow of the secondary is converging after reflection.John