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[C14] Carbin Fiber tube

paulatkinson22 All Messages By This Member #296 Although I am sure that there are others that can expound upon "carbon fiber" ?better than I, I will venture what I have heard. ?Supposedly, the carbon fiber is lighter than aluminum and is suppose to have a better thermal quality allowing the scope to cool more quickly. ?However, what I have heard is that this really wouldn't make a difference unless you were flying your telescope at mach 3 where friction would be heating the tube to VERY high temperatures. ?Otherwise, the tube will cool off maybe a little quicker but not signifcantly faster. ?I can verify that lbs per inch it is not lighter than the Meade aluminum OTA's. ?I forget exactly and don't have the numbers right in front of me, but comparing my 12" Meade to the 11" Celestron on a per inch basis it wasn't lighter. ?I don't even know if they make the 14 in Carbon. ?Mine came in aluminum and I was never given an option.
jamesnanderson All Messages By This Member #297 开云体育 I pester my dealer repeatedly to see if Celestron could deliver the my C14 in carbon fiber (or is carbon fibre) and he indicated no such animal existed patiently and profusely and that the aluminum would cool just a quickly or quicker.? ? Jim ? toggle quoted message Show quoted text ----Original Message----- From: paulatkinson22@... [mailto:paulatkinson22@...] Sent: Thursday, May 30, 2002 7:11 PM To: C14@... Subject: Re: [C14] Carbin Fiber tube Although I am sure that there are others that can expound upon "carbon fiber" ?better than I, I will venture what I have heard. ?Supposedly, the carbon fiber is lighter than aluminum and is suppose to have a better thermal quality allowing the scope to cool more quickly. ?However, what I have heard is that this really wouldn't make a difference unless you were flying your telescope at mach 3 where friction would be heating the tube to VERY high temperatures. ?Otherwise, the tube will cool off maybe a little quicker but not signifcantly faster. ?I can verify that lbs per inch it is not lighter than the Meade aluminum OTA's. ?I forget exactly and don't have the numbers right in front of me, but comparing my 12" Meade to the 11" Celestron on a per inch basis it wasn't lighter. ?I don't even know if they make the 14 in Carbon. ?Mine came in aluminum and I was never given an option. `To unsubscribe from this group, send an email to: C14-unsubscribe@...` `Your use of Yahoo! Groups is subject to the .`
paulatkinson22 All Messages By This Member #312 Kevin, Perhaps that is it. ?I am no expert so I am speculating with my thoughts. ?However, I do not understand how the aluminum would continue to cool and the carbon fiber not? ?Won't each type of material cool to the ambient temperature of the air? ?That means both scopes should equalize at the same temp, shouldn't they? ?I don't think one (the aluminum) could become cooler than the actual temp of the air, could it? ?? Paul Atkinson
[email protected] #310 开云体育 My understanding is not that the carbon fiber will cool more quickly but that once it reaches equilibrium, it stays there.? In contrast, the aluminum continues to cool throughout the night as the temperature continues to drop. ? Clear skies, Kevin Dixon ksbtk@... toggle quoted message Show quoted text From: Jim Anderson I pester my dealer repeatedly to see if Celestron could deliver the my C14 in carbon fiber (or is carbon fibre) and he indicated no such animal existed patiently and profusely and that the aluminum would cool just a quickly or quicker.?
[email protected] #314 开云体育 Good afternoon Paul: ? I don't pretend to understand this very well either.? I am just going by what some folks who are experts in composite materials tell me.? I don't understand the mechanism behind it but one of the properties of carbon fibers (besides being lightweight and very strong) is the ability to achieve and maintain thermal equilibrium.? Aluminum apparently does not share this characteristic.? ? I do have empirical experience to back this up.? When imaging with a NexStar 11 GPS, it was not necessary for me to refocus throughout the night.? With both my C-14 and my C-8, refocusing must be done every hour or so. ? That's about the extent of my knowledge on the subject. ? Clear skies, Kevin Dixon ksbtk@... toggle quoted message Show quoted text From: paulatkinson22@... Kevin, Perhaps that is it. ?I am no expert so I am speculating with my thoughts. ?However, I do not understand how the aluminum would continue to cool and the carbon fiber not? ?Won't each type of material cool to the ambient temperature of the air? ?That means both scopes should equalize at the same temp, shouldn't they? ?I don't think one (the aluminum) could become cooler than the actual temp of the air, could it????
brian #316 开云体育 Both would go below air temperature for same reason that scopes dew up? (unbalanced radiation loss on the sky-side of the scope). ? I am no expert but I think the carbon fibre is supposed to be optically more stable because it has a low coefficient of thermal expansion - so the temperature drops, just like aluminium, but the tube does not shrink nearly so much which means?the focus does not need adjustment. ? Brian ? toggle quoted message Show quoted text ----- Original Message ----- From: paulatkinson22@... To: C14@... Sent: Friday, May 31, 2002 9:48 PM Subject: Re: [C14] Carbin Fiber tube Kevin, Perhaps that is it. ?I am no expert so I am speculating with my thoughts. ?However, I do not understand how the aluminum would continue to cool and the carbon fiber not? ?Won't each type of material cool to the ambient temperature of the air? ?That means both scopes should equalize at the same temp, shouldn't they? ?I don't think one (the aluminum) could become cooler than the actual temp of the air, could it? ?? Paul Atkinson `To unsubscribe from this group, send an email to: C14-unsubscribe@...` `Your use of Yahoo! Groups is subject to the .`

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