[NSRCA-discussion] Heat Sinks

[John Konneker]

lagrue at hotmail.com
Jeremy Chinn...great guy!
JLK> From: wgalligan at att.net> To: nsrca-discussion at lists.nsrca.org> Date: Fri, 1 Aug 2008 11:33:57 -0500> Subject: Re: [NSRCA-discussion] Heat Sinks> > 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: <glmiller3 at suddenlink.net>> To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>> 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 <lagrue at hotmail.com> 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 <jpavlick at idseng.com> wrote: > > =============> You didn't fly > >> fast enough to heat them up! <LOL> 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 <lagrue at hotmail.com> 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> > ---------------------------------> > > > _______________________________________________> NSRCA-discussion > > mailing list> NSRCA-discussion at lists.nsrca.org> > > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > > > > ---------------------------------> Use video conversation to talk > > face-to-face with Windows> > Live Messenger. Get started. > > _______________________________________________> NSRCA-discussion mailing > > list> NSRCA-discussion at lists.nsrca.org> > > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > > > _______________________________________________> NSRCA-discussion mailing > > list> NSRCA-discussion at lists.nsrca.org> > > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion> > _________________________________________________________________> > Time for vacation? WIN what you need- enter now!> > http://www.gowindowslive.com/summergiveaway/?ocid=tag_jlyhm> > _______________________________________________> > NSRCA-discussion mailing list> > NSRCA-discussion at lists.nsrca.org> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion > > _______________________________________________> NSRCA-discussion mailing list> NSRCA-discussion at lists.nsrca.org> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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