[NSRCA-discussion] Heat Sinks

[Wayne Galligan]

THANKS........
  ----- Original Message ----- 
  From: John Pavlick 
  To: General pattern discussion 
  Sent: Friday, August 01, 2008 12:11 PM
  Subject: Re: [NSRCA-discussion] Heat Sinks


  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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