[NSRCA-discussion] Heat Sinks

[krishlan fitzsimmons]

Jeremy, 
 
At the nats, finals morning, I noticed my first flight I was way down on power as my batts were cool. I put them in Jerry Budd's warmer and noticed a big difference in power. I do believe that the packs operate more efficiently at "operating" temperature. I'm sure you know this as you are a genius when it comes to electrics!!
I didn't make it down to your site as Masters flew at the same time as you. Do you have any pics you can forward me for the Kfactor? 
 
Nice meeting you! You should come out to our District championship on November 1st and 2nd!! Will be nice weather out here in Cali.....

Chris 
 
 
 

--- On Thu, 7/31/08, JEREMY CHINN <lagrue at hotmail.com> wrote:

From: JEREMY CHINN <lagrue at hotmail.com>
Subject: Re: [NSRCA-discussion] Heat Sinks
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Thursday, July 31, 2008, 8:06 PM




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



From: jpavlick at idseng.com
To: nsrca-discussion at lists.nsrca.org
Date: Thu, 31 Jul 2008 22:12:06 -0400
Subject: 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 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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