Re: [ATM] New 16" telescope design

["Alan Scott" <alanne1956@hotmail.com>]

Tom,
  Thanks - I appreciate it.

  Correct.  My next focuser will have a longer tube, thus allowing a larger 
focusing range.  Honestly, that may remove my need for a shroud.  As far as 
wind profile, when it is windy, all that I have is the secondary ring.  No 
baffle, no shroud.  It is surprising how stable the scope is under those 
conditions.

  All links given are broken, at least tonight.  I would love to see them.

  Thanks for the comments,

alan




>From: "Tom Krajci" <tom_krajci@tularosa.net>
>To: <atm@atmlist.net>,<alanne1956@hotmail.com>
>Subject: RE: New 16" telescope design
>Date: Mon, 21 Nov 2005 03:14:47 -0700
>
> >From: "Alan Scott" <alanne1956@hotmail.com>
>
> >I have just finished the designs for an ultralight 16"....
>
> >http://www.xmission.com/~alanne/DS4Main.html
>
>Overall seems like a nice design!
>
>You list as one requirement:
>
>"This telescope will be able to carry a half height or full height shroud.
>It will also be usable without a shroud for observing during windy nights."
>
>Unfortunately you provide no diagrams/drawings, so I looked at:
>http://www.xmission.com/~alanne/DS3-NightScope-1.jpg
>
>Because you use a low profile focuser/focal plane position...you are forced
>to use a large baffle disk opposite the secondary mirror.  That will 
>provide
>a large wind profile.  Are you sure you want to do that?
>
>See: http://overton2.tamu.edu/aset/krajci/dobsonian/dobsonian.htm
>specifically:
>http://overton2.tamu.edu/aset/krajci/dobsonian/baffle-train-67pct.JPG
>for an example of a smaller baffle disk that's possible if you don't use a
>low profile focal plane position.  This presents a smaller wind profile.
>(And there are some other anti-wind measures covered on this page.)
>
>Also, why use a shroud?
>
>Tom Krajci
>Cloudcroft, New Mexico
>
>
>
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