[NSRCA-discussion] Heat Sinks

[JEREMY CHINN]

The assessment on my Kudzu at the Nats was that my batteries never even got to optimum operating temperature...... 

From: jpavlick at idseng.comTo: nsrca-discussion at lists.nsrca.orgDate: Thu, 31 Jul 2008 22:12:06 -0400Subject: Re: [NSRCA-discussion] Heat Sinks



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 Pavlickhttp://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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