[NSRCA-discussion] Heat Sinks

[krishlan fitzsimmons]

Interesting idea Earl. My batts don't usually get hot enough to need them. But good idea. 
IA possible answer for now though, is to baffle with foam to about 1/2" or so around the battery which I'm sure you already know anyway.. It's the best we can do till they start putting a spacer between each cell and allow airflow into the packs. Which I've seen in some smaller packs. I don't like the fact that in a 5 cell pack, the outside 2 cells heat up less than the inner 3. I'm almost positive this has some affect on the inner cells life span vs the outers. 
 
Nice meeting you at the nats!!!


Chris 
 
 
 

--- On Thu, 7/31/08, John Pavlick <jpavlick at idseng.com> wrote:

From: John Pavlick <jpavlick at idseng.com>
Subject: Re: [NSRCA-discussion] Heat Sinks
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Thursday, July 31, 2008, 7:12 PM





Sounds heavy. Don't electric airplanes have trouble making weight (except for Dave Lockhart's of course)? What are you guys doing for letting air in / out of the fuse. Without proper airflow, even a good heat sink won't work. Actually wouldn't it be better to make some kind of (light weight) thermostatically controlled cooling system? Cold LiPOs don't make optimum power.
 
John Pavlick
http://www.idseng.com

----- Original Message ----- 
From: Earl Haury 
To: Discussion List, NSRCA 
Sent: Thursday, July 31, 2008 9:49 PM
Subject: [NSRCA-discussion] Heat Sinks


We all tend to mount E batteries on some sort of wooden / carbon / nomex shelf and tie them down with Velcro or a clamp plate - none of which are very good at transferring heat. Possibly we could improve heat transfer from the batts to the cooling air by using aluminum, or better yet - finned aluminum heatsink material for the shelf / clamp. 
 
I've spent a fair bit of time trying for find appropriate heatsink material online - something 4" long x 3" wide with a high count of thin,  maybe 1/4 high, fins might work. Unfortunately, there's tons of heatsink material available from Newark, Mauser, etc. but it's difficult to find the right stuff - especially material light enough for our use. The closest I've come is Thermaflo # E1243, but I'm lacking a small quantity source. 
 
Anybody work with this stuff & have recommendations or sources?
 
Earl



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