Observatory progress update
Posted 21 October 2012 - 11:20 PM
Posted 21 October 2012 - 11:21 PM
Posted 21 October 2012 - 11:23 PM
Posted 21 October 2012 - 11:26 PM
Posted 21 October 2012 - 11:32 PM
Posted 22 October 2012 - 07:05 AM
Posted 22 October 2012 - 09:25 AM
Posted 22 October 2012 - 10:33 AM
"Solarbord" is just regular OSB panels with a shiny semi-waterproof thick metal foil on one side. They can reflect more than 90% of the heat away from the wall. They're available at any Lowe's or Home Depot. Solarbord reflects heat away from the inner walls and keeps them a LOT cooler. I'll put up horizontal 1x4 pine boards at top, middle and bottom, all around the building, which act as thermal spacers. Then the R-panel attaches to the 1x4's, leaving a 3/4" air gap between the R-panels and Solarbord. This allows hot air to convect up the hot walls and out the top, rather than cooking the walls. The west wall is shown in the last post, 5482946, and it will get the hottest of all. Using Solarbord and thermal standoffs will keep the wall 30 degrees cooler (or more) than it would be with the R-panels alone. By using Solarbord panels, I'm not sure I'll even need insulation on the interior walls.
Posted 22 October 2012 - 11:21 AM
Thanks for the information!
Posted 22 October 2012 - 12:17 PM
Posted 22 October 2012 - 08:49 PM
All Solarbord panels up - I added wall bracing today to keep the walls from bending and being damaged in thundershowers we had today and coming again Friday.
The Solarbord makes the building extremely strong in shear (trying to flex into a parallelogram), but does nothing to strengthen individual walls against high winds. When the tracks are attached above, they will stiffen the walls against bending.
Posted 22 October 2012 - 08:53 PM
Posted 22 October 2012 - 08:58 PM
That's all for now - will possibly have supports and ROR tracks up next weekend. My neighbor Kennan is an amazing welder and construction dude and he's having a lot of fun working on it.
Posted 22 October 2012 - 09:16 PM
Please correct me if I'm wrong but I always thought that the shiny side of these solar panels had to face the interior.
Posted 22 October 2012 - 09:43 PM
Yes on the spacious room! Decades ago a club I was with thought they could save some money by only building a 12'x16' building. Bad idea. You end up bumping into the scope, walls, or worktable almost all night. My 16'x18' should be a lot more roomier and more enjoyable.
Posted 23 October 2012 - 12:10 AM
Posted 23 October 2012 - 05:10 PM
Mr. Paramount ME will be riding atop the pier. So far, I have two separate OTA's, but more are coming:
1. Takahashi TOA-130
2. 5" Tinsley Maksutov and Coronado PST on same baseplate
Next scopes to come:
My 16" f/6 in a new all-composite super-stiff lightweight tube to be built by Optical Mechanics (I made primary)
10" f/26.5 Maksutov (design done, glass bought, Jerry Logan curve-generated and ready to grind)
8" Herrig (just GOTTA see that one work!)
6" f/10 refractor (I designed and worked the lens on that one)
6" Retro-triplet (my own invention, y'all are gonna like this one)
After that I'm not sure. Depends how soon I retire and can get going on them. Still want to do a big Schupmann and apochromat lens.
Posted 23 October 2012 - 09:26 PM
Yeah that pretty much makes me want to do the 10" f/26.5 Mak first. That's only a tiny bit shorter EFL than the AP 10" f/14.6 with 2X Barlow (f/29.2), but I'll have a slightly smaller secondary spot and CO. And, no extra optics in the path. I'll have to work it good to match AP optical performance, though. I like the Flea cameras - so small but so good!
Posted 28 October 2012 - 12:22 PM
Posted 28 October 2012 - 12:39 PM
Posted 28 October 2012 - 03:26 PM
Posted 29 October 2012 - 09:24 AM
:waytogo:You got 'er Sherlock! Mike
Ah - excellent point Mikey. In other words, don't run the 1x4's continuously around the periphery, but instead leave a gap to improve circulation?
Posted 29 October 2012 - 09:27 AM