[NSRCA-discussion] Heat Sinks

Fri Aug 1 09:11:39 AKDT 2008

Jeremy's Email (he's on "the list"): lagrue at hotmail.com

  John Pavlick

Wayne Galligan <wgalligan at att.net> wrote:
  Speaking of the Kudzu..... I have a set of wings and stabs from a Genesis 
that need a fuse and I thought that profile platform might be a good place 
to use them for knock around plane. Anyone know how to contact the builder 
of that plane for some plans?

Wayne Galligan

----- Original Message ----- 
From: 
To: "General pattern discussion" 
Sent: Friday, August 01, 2008 9:57 AM
Subject: Re: [NSRCA-discussion] Heat Sinks

> Fascinating stuff, Jeremy, Thanks for the reference. It looks to me (as a 
> naive evaluation) that the energy cost and additional heat generated would 
> be more than the potential gain for our uses-- unless they were built into 
> the battery packs- but then you'd have to somehow vent the "hot side" away 
> from the adjacent cell....what we really need is better airflow 
> over/around our cells---like hanging them out in the air like the Kudzu- 
> or putting them in an open pipe tunnel like I did on my E Focus 
> conversions. All my batteries enclosed in a fuse get hotter than I'd like 
> (125-135 F) though I've been told this is "optimum operating temp" anyway. 
> I've played with ductwork, vents and exhaust configurations and I can't 
> honestly tell much difference.
>
> G
> ---- JEREMY CHINN wrote:
>
> =============
>
> With much the same question in mind, I found this with Google.....
>
> http://www.dansdata.com/peltprac.htm
>
>> Date: Fri, 1 Aug 2008 09:24:56 -0500> From: glmiller3 at suddenlink.net> To: 
>> jpavlick at idseng.com; nsrca-discussion at lists.nsrca.org> Subject: Re: 
>> [NSRCA-discussion] Heat Sinks> > What the heck are Peltiers? Flying in LA 
>> I never have to worry about batteries being too COOL!> > I'm always 
>> looking for a way to improve heat exchange, though. > > G> ---- John 
>> Pavlick wrote: > > =============> You didn't fly 
>> fast enough to heat them up! Seriously, LiPOs perform best within a 
>> certain temperature range. You electron heads should look into something 
>> that can keep the batteries within this range. Maybe Peltiers? These are 
>> nice because thay can generate heat OR provide a cooling effect. If 
>> anyone wants to explore this I'd be glad to help.> > John Pavlick> > 
>> JEREMY CHINN wrote:> .hmmessage P { margin:0px; 
>> padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } The 
>> assessment on my Kudzu at the Nats was that my batteries never ev
> en 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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