imhotep
Pooh-Bah
Reged: 02/14/07
Posts: 1429
Loc: Tampa, FL
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I am doing soome prelimenary research for a new product line. Your input is greatly appreciated.
If you own a 10" or 12.5" conical, what size tube (or other container) is yours mounted in?
For example, I personally own two Royce conicals. My 8" is mounted inside a 10" hastings tube, and my 12.5" is mounted inside a wooden mirror box.
I suspect most people go with a 10" tube for the 8" mirrors, and a 12" tube for the 10" mirrors. The 12.5" is where it gets more interesting.
Does anyone have a 12.5" conical mounted inside a 14" or 16" tube?
Thanks again for your feedback.
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Curt
8" F5 Newtonian Astrograph
Orion 80ED CUSTOM
Edmund Optics 4.25" 'Palomar' Newtonian, 1968 vintage
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gatorengineer
scholastic sledgehammer
Reged: 02/28/05
Posts: 882
Loc: Hellertown, PA
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My 12" F4 will be living in a 14" tube.... Best take a look at Newt and see what it says for your mirror and layout. You can Google NEWT telescope design if you are unfamiliar
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20" F5 Dob
16" Dob in pieces
Comet Catcher
MN71
12" Doc Clay Sky Patrol MEADE SCT
12.5" F4 Newt under construction
Siebert 45mm Binoviewers
Lots of binos---
Optics Past - 8" Stf Mak, 4" B&W triplet, 6"Schmidt newt, 12"LX200, C8, Meade LX10-10", 10" MEADE ACF, SN8, TAL150K, Orion 150MC, Jason 60mm refractor, ATM 6" F8, WO 110FLT, 92mm Off Axis Newt, Televue Genesis, Nikon 20x120 bino's, 15x110 Boarderguards, Kuhne Flaks
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polaraligned
sage
Reged: 12/26/08
Posts: 229
Loc: P. R. of New Jersey
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I would go with the larger dia tube and corresponding larger secondary. It is going to be a trade-off. This is just my personal preference. I am more worried about the thermal issues than the increase in CO.
If a truss design is used, then there is little worry about the tube size providing you are ok with any vignetting a smaller tube may cause.
It would be best to look at the overall design before deciding on a tube size.
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sevenhelmet
member
Reged: 06/15/09
Posts: 42
Loc: Virginia Beach, VA
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My 10" will be living in a Truss-tube that has an internal diameter of just over 11.5 inches (a Lightbridge truss tube.) I've run the numbers through Newt several times, and don't forsee any issues with my rig.
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10" f/5 Reflector
Some decent EPs
An inquisitive mind
Edited by sevenhelmet (11/05/09 04:33 PM)
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Bird
Post Laureate
Reged: 08/07/03
Posts: 3024
Loc: Canberra, Australia
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I have a 14.5" royce conical mounted in a 20" tube. I have plans to upgrade the mirror to 18" one day and re-use the same tube.
cheers, Bird
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Deep Sky Optics 13.1" f/5.5 newtonian,
PGR Dragonfly Express, PGR Dragonfly 2
RedHat Linux + Coriander
http://www.acquerra.com.au/astro/
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deSitter
Carpal Tunnel
Reged: 12/09/04
Posts: 2926
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Quote:
I am doing soome prelimenary research for a new product line. Your input is greatly appreciated.
If you own a 10" or 12.5" conical, what size tube (or other container) is yours mounted in?
For example, I personally own two Royce conicals. My 8" is mounted inside a 10" hastings tube, and my 12.5" is mounted inside a wooden mirror box.
I suspect most people go with a 10" tube for the 8" mirrors, and a 12" tube for the 10" mirrors. The 12.5" is where it gets more interesting.
Does anyone have a 12.5" conical mounted inside a 14" or 16" tube?
Thanks again for your feedback.
I bought an Astrozap 10" f/4.5 Newtonian as a starting point, and modified the mirror cell to take a conical. It has a 11.8" ID tube like the Meade SN - same cell in fact. Rolled aluminum seamless tube stiffened by cast end rings - simple and inexpensive but attractive and sturdy. GSO make a similar OTA for their Dobs.
-drl
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imhotep
Pooh-Bah
Reged: 02/14/07
Posts: 1429
Loc: Tampa, FL
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Thanks everyone for your feedback. You are confirming what I thought to be a general range of norms.
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Curt
8" F5 Newtonian Astrograph
Orion 80ED CUSTOM
Edmund Optics 4.25" 'Palomar' Newtonian, 1968 vintage
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Scott Watson
sage
Reged: 05/26/06
Posts: 282
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FWIW, my 12.5" conical is in a 14" ID plywood tube. No problems.
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Jeff Morgan
Carpal Tunnel
Reged: 09/28/03
Posts: 1987
Loc: Prescott, AZ
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Not really mounted in a tube at all!
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Jeff Morgan
Prescott, AZ
Wile E. Coyote School of Telescope Making
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Mike Phillips
Pooh-Bah
Reged: 02/21/06
Posts: 1454
Loc: Swift Creek, NC - 35.682 N, 78...
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I too am interested in this discussion. Not to hijack the thread at all but what are some supplier options for 16" (for a 14.5" mirror) tubes or trusses?
Mike
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Gallery/Blog/RSS/Tutorials
Mike's Lesson on Seeing, Collimation and Focusing
**NEW** VIDEO HowTo: Planetary Processing Routine v8 **NEW**
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rboe
Reged: 03/16/02
Posts: 45406
Loc: Phx, AZ
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Check the pinned Best of ATM links. I believe drum tubes are listed as a source.
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Ron
NS11GPS
Pronto
16" dob
15X70 Obies
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Mike Phillips
Pooh-Bah
Reged: 02/21/06
Posts: 1454
Loc: Swift Creek, NC - 35.682 N, 78...
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Quote:
Check the pinned Best of ATM links. I believe drum tubes are listed as a source.
My 1417 posts are inferior to your 45111. I see the sticky, but not the drum tubes...
Hastings Aluminum Tubes seems to max out at 12" diameter. I did a search on the Internet (read Google'd it) but didn't find..
Thanks much!
Mike
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Gallery/Blog/RSS/Tutorials
Mike's Lesson on Seeing, Collimation and Focusing
**NEW** VIDEO HowTo: Planetary Processing Routine v8 **NEW**
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