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HandyAndy
professor emeritus
Reged: 01/11/08
Posts: 650
Loc: West Midlands and around
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Hi,
Failed to find a reference using the search.
Someone posted a link to a site with a wide range of drum shell sizes suitable for OTA's.
Could someone re-post or get the search to work.
Cheers. Andrew.
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Monarch 8x42, Zeiss 10x50 WA
10mm F2, Pentax 60mm F5
City: 7" MN78: MK4#2, 10" F6.3: MK4#1, 16" F5 ParaCorr
Country: 8" VISAC: (GP2)
Car: 6" F5 MPCC: SP, 5" 127mm F7.5 (GP2)
TV 55mm, Paragon 40mm, UO Pretoria 28mm
B&L 32 Pl, Clave's 25, 8, 6, 2x
Hyperions 5, 8, 13, 17, 24, 31
Nagler1 9mm, Meade 14mm 4000 UWA
Antares 1.6x, 0.7x, 0.5x
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TxStars
sage
Reged: 10/01/05
Posts: 492
Loc: Lost In Space
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These might be a bit short:
http://www.aitwood.com/StoreFront.Asp?WoodType=POPLAR&CATID=10&Section=HALFCYL&wDesc=Half%20Cylinders%20(180%20degrees)
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http://txstars.org/
Tak FC-50 / Tak FCT-65 / Tak FC-100
Celestron 8" Schmidt camera
Clasic Sand Cast C-8 & C-5
"SCUZZO" 300/f 1.1
Cameras: Nikon F2/Mamiya 645, press 6x7 ,6x9/ Hasselblad 6x6 / Lenses Yes Many - Yay Film
Mount - GoTo by hand and eye
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Scott Watson
sage
Reged: 05/26/06
Posts: 282
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Anderson makes many drum shell suitable for telescopes. I used them successfully here
http://i3.photobucket.com/albums/y90/hidesome/2007_0415_095055AA.jpg?t=1256173667
Edited by Scott Watson (10/21/09 09:11 PM)
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Eric P
sage
Reged: 04/04/05
Posts: 390
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Quote:
Anderson makes many drum shell suitable for telescopes. I used them successfully here
http://i3.photobucket.com/albums/y90/hidesome/2007_0415_095055AA.jpg?t=1256173667
Hi Scott, Great looking dob. How is the balance with the shell secondary? I am thinking of using an old bass drum shell for a 17.5" scope.
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Scott Watson
sage
Reged: 05/26/06
Posts: 282
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The balance is higher than some, but I like that anyway so that it stays balanced without springs at all altitude angles. The plywood ring that the truss poles attach to provides additional stiffness. In the end I chose to use a 4-vane spider instead of 3 because it was much stiffer with my somewhat thin, flexible drum cage. Basically, I love the drum shells and I'm quite surprised they aren't more popular among ATM's. I guess Dobson's theology has warped everyone's mind to the point that anything but cardboard or paper is viewed as antithetical.
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scopemankit
super member
Reged: 01/27/09
Posts: 137
Loc: south africa
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If you leave the snares on you may be able to get a new sound out of your scope!
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Chris
Cape Town
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