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Heat dissipation
Most laptops dissipate heat through the bottom. If you put a running laptop on a bed, it will probably overheat because no air will circulate under the bottom. The converse of this is also true... the more air thatís allowed to circulate under the bottom, the better chance the heat will dissipate.

However, results will vary. Your laptop will probably run cooler outdoors in 100 degree heat in a gentle breeze than in your breezeless air conditioned office. The difference is air movement, (air is considered a fluid in the world of thermodynamics ) and moving that fluid hot air away from the laptop's bottom will allow better heat dissipation.

Posted on Apple's website, reprinted with author's permission.

Author: William R. Merz, President, Documex
Email: wrm@documex.com
Posted: Saturday, 7/25/98 1:39 AM CDT
Category: PowerBook G3
Model: G3/250/13

Subject: Solution for excessive heat in G3 Powerbooks

For anyone who is worried about the excessive heat generated by your new G3 Powerbook. I just bought a device called Road Tools' CoolPad. It cost $19.95 US. It's a simple device comprised of 2 pieces of ABS plastic connected with teflon bearing(s). It actually looks pretty tough/strong. It allows your Powerbook to rotate 360 degrees. This alone makes it a cool device.

But here's the good news. I've been monitoring the temperature at the processor (as read by Powerlogix Speedmeter) in a room with consistent temperature and conditions; and it is consistently 10 to 20 degrees cooler when on the Coolpad. The bottom of my powerbook used to be hot, the table/flat surface that it was on was even hot. This thing may even save the table finish from being burned off (which may be inevitable).

NO, I do not work for them, nor do I have any affiliation with them. I just see this device as a solution to keeping down the overall heat that the internals are consistently subjected to.

I can't seem to see any downside to using this device; (please correct me Apple if I am wrong) except that you can't use it in your lap. It's also small enough to slip into the file pocket on most carrying cases. It's thin and a lot smaller than the Powerbook. They have a website at www.roadtools.com. Incidentally, I have a G3/250/13. This is the BEST accessory that I have purchased as of yet.

To: PowerList@ogrady.com
From: "Scott M. Hinnrichs"

I actually got a CoolPad, and it works as advertised. I use it on top of
my LD box on my couch instead of the DVCAM cases, and the CoolPad is much more stable. The temperature is exactly the same as with the DVCAM cases... so the CoolPad lifts up the PB 292 high enough to allow more air flow than without it.

The CoolPad is too small to use in your lap by itself, but on top of a
tray/board/LDBox it works great.

I also used the CoolPad outside on top of a small table next to a lounge
chair... very nice. BTW, even though it was very hot outside the PB 292
ran cooler outside than in the air-conditioned house! The cross currents
of air that constantly run outside dispersed the heat much better than the
still air of indoors.

I was worried that the CoolPad would allow the PB to move too freely, but the friction between the parts is enough to keep it from spinning freely
when set on an angle... my couch dips toward the seat a few degrees... no problem with the CoolPad at that angle.

For $20 you can't go wrong!
Scott

back..................................more heat info from Apple ....... . ........
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.	..	.		back......................................more heat info from Apple ................................... Heat dissipation Most laptops dissipate heat through the bottom. If you put a running laptop on a bed, it will probably overheat because no air will circulate under the bottom. The converse of this is also true... the more air thatís allowed to circulate under the bottom, the better chance the heat will dissipate. However, results will vary. Your laptop will probably run cooler outdoors in 100 degree heat in a gentle breeze than in your breezeless air conditioned office. The difference is air movement, (air is considered a fluid in the world of thermodynamics ) and moving that fluid hot air away from the laptop's bottom will allow better heat dissipation. Posted on Apple's website, reprinted with author's permission. Author: William R. Merz, President, Documex Email: wrm@documex.com Posted: Saturday, 7/25/98 1:39 AM CDT Category: PowerBook G3 Model: G3/250/13 Subject: Solution for excessive heat in G3 Powerbooks For anyone who is worried about the excessive heat generated by your new G3 Powerbook. I just bought a device called Road Tools' CoolPad. It cost $19.95 US. It's a simple device comprised of 2 pieces of ABS plastic connected with teflon bearing(s). It actually looks pretty tough/strong. It allows your Powerbook to rotate 360 degrees. This alone makes it a cool device. But here's the good news. I've been monitoring the temperature at the processor (as read by Powerlogix Speedmeter) in a room with consistent temperature and conditions; and it is consistently 10 to 20 degrees cooler when on the Coolpad. The bottom of my powerbook used to be hot, the table/flat surface that it was on was even hot. This thing may even save the table finish from being burned off (which may be inevitable). NO, I do not work for them, nor do I have any affiliation with them. I just see this device as a solution to keeping down the overall heat that the internals are consistently subjected to. I can't seem to see any downside to using this device; (please correct me Apple if I am wrong) except that you can't use it in your lap. It's also small enough to slip into the file pocket on most carrying cases. It's thin and a lot smaller than the Powerbook. They have a website at www.roadtools.com. Incidentally, I have a G3/250/13. This is the BEST accessory that I have purchased as of yet. To: PowerList@ogrady.com From: "Scott M. Hinnrichs" I actually got a CoolPad, and it works as advertised. I use it on top of my LD box on my couch instead of the DVCAM cases, and the CoolPad is much more stable. The temperature is exactly the same as with the DVCAM cases... so the CoolPad lifts up the PB 292 high enough to allow more air flow than without it. The CoolPad is too small to use in your lap by itself, but on top of a tray/board/LDBox it works great. I also used the CoolPad outside on top of a small table next to a lounge chair... very nice. BTW, even though it was very hot outside the PB 292 ran cooler outside than in the air-conditioned house! The cross currents of air that constantly run outside dispersed the heat much better than the still air of indoors. I was worried that the CoolPad would allow the PB to move too freely, but the friction between the parts is enough to keep it from spinning freely when set on an angle... my couch dips toward the seat a few degrees... no problem with the CoolPad at that angle. For $20 you can't go wrong! Scott back..................................more heat info from Apple ....... . ........ ....................
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