[NSRCA-discussion] Heat Sinks

[Ron Van Putte]

Oh yeah?  You're lucky you're up there in Yankeeland and can't make  
it down to the Jacksonville, FL contest.

Seriously, I'm glad to hear that you're "back in the saddle again"  
and are competing.

For those of you who haven't watched a "practiced" Matt Kebabjian  
fly, he's Mr Smooth.

Ron VP

On Aug 4, 2008, at 12:09 PM, rcmaster199 at aol.com wrote:

> How many times have we "finished" a project and then remembered at  
> the field the last couple things we still needed? It's happened to  
> me. The plane isn't finished until it flies which only completes a  
> phase. And then it's tweeking time.....so a plane is never  
> finished, I suppose, until it is "retired" (voluntarily on  
> involuntarily, take your pick).
>
> As for project management, all I can say is "....best layed plans  
> of mice and men.....". Most schedules I've supported were obsolete  
> the day they were issued. Egads!!
>
> Hey congratulate me!! I actually flew a whole contest this past  
> weekend. First in 4 years for me. All you Masters winnies better  
> watch out. With more practice I just might take a round from RVP.
>
> MattK
>
> -----Original Message-----
> From: Ron Van Putte <vanputte at cox.net>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Mon, 4 Aug 2008 12:46 pm
> Subject: Re: [NSRCA-discussion] Heat Sinks
>
> Work expands as the time to completion approaches.  I am "finishing"
> an airplane to fly tomorrow and it's amazing how many of the "little"
> tasks leap out as I seem to get close to done.
>
> Ron VP
>
> On Aug 4, 2008, at 10:03 AM, AtwoodDon at aol.com wrote:
>
>> As in most projects, when you are 99% done, you only have 25% left
>> to do.  That is how most projects in my work environment went.  I
>> always told the project managers that when they reported their
>> project status and I was usually
> right.  If I was wrong, they had
>> more than 25% left to go.....
>>
>> Don
>>
>>
>>
>> In a message dated 8/4/2008 7:30:18 A.M. Pacific Daylight Time,
>> gfowler at raytheon.com writes:
>>
>> Anthony
>>
>> My new plane is 99.5% complete-all I have to do is balance and
>> align the wings-and then "re-learn" to fly. My kid just completed
>> the massive soccer "qualifying" tournament-6 games, two weekends,
>> nothing below 103F, so I am conditioned to start flying again.
>>
>>
>>
>>
>> Gray Fowler
>> Senior Principal Chemical Engineer
>> Radomes and Specialty Apertures
>> Technical Staff Composites Engineering
>> Raytheon
>>
>>
>> Anthony Romano <anthonyr105 at hotmail.com>
>> Sent by: nsrca-discussion-bounces at lists.nsrca.org
>> 08/04/2008 09:17 AM
>> Please respond to
>> General pattern discussion <nsrca-discussion at lists.nsrca.org>
>>
>>
>> To
>> General pattern discussion <nsrca-discussion at lists.nsrca.org>
>> cc
>> Subject
>> Re: [NSRCA-discussion] Heat Sinks
>>
>>
>>
>>
>>
>> Hi Gray,
>> Glad to see you still lurking.
>> First, saw that technique to cool the batteries on the moon rover.
>>
>> Anthony
>>
>>
>>
>>
>>
>> To: nsrca-discussion at lists.nsrca.org
>> From: gfowler at raytheon.com
>> Date: Mon, 4 Aug 2008 08:51:48 -0500
>> Subject: Re: [NSRCA-discussion] Heat Sinks
>>
>>
>> Guys
>>
>> Considering that I do not fly E, this may not work, but here is a
>> trick from the missile world where the electronics generate massive
> =0
> A> heat in a small package (no air cooling at mach 3!!)  that must be
>> dissapated.
>>
>> Heat sinks work well but rely on intimate contact with the heat
>> source, which can be the actual problem-how to get the battery heat
>> into the sink with the odd shape of the battery packs and the
>> flatness of the aluminum. Since you guys know the operating
>> temperature of the dischaging batteries, choose a wax that melts
>> just below your target temperature. Cast the wax around the battery
>> pack (you need a container or tub-super thin aluminum). Then have
>> the cooling fins-heat sink on top. When the batteries heat up the
>> wax will melt. This phase change will cool the batteries-then the
>> viscous liquid wax will also efficiently transfer the heat to the
>> aluminum tub and the aluminum heat sink. The heat sink will cool
>> the wax which then cool the batteries.
>>
>> After recharging, the batteries cool, the wax resolidifies and it
>> is ready to go all over again. Wax is light weight, the aluminum
>> tub-heatsink  would need to be custom fabbed and very thin-and
>> basically sealed.  Wax can be easily cleaned from the batteries if
>> needed.
>>
>> Just a thought
>>
>>
>>
>>
>> Gray Fowler
>> Senior Principal Chemical Engineer
>> Radomes and Specialty Apertures
>> Technical Staff Composites Engineering
>> Raytheon
>>
>>
>> "Earl Haury" <ejhaury at comcast.net>
>> Sent by: nsrca-discussion-bounces at lists.nsrca.org 08/01/2008 04:15 PM
>
>> Please respond to
>> General pattern discussion <nsrca-discussion at lists.nsrca.org>
>>
>>
>> To
>> <bob at toprudder.com>, "General pattern discussion" <nsrca-
>> discussion at lists.nsrca.org>
>> cc
>> Subject
>> Re: [NSRCA-discussion] Heat Sinks
>>
>>
>>
>>
>>
>>
>>
>> Bob
>>
>> My thought is that packs setting on something thermally conductive
>> rather than insulating seems better. Love your CO2 cartridge idea -
>> wonder if AMA would consider that a "gaseous boost".
>>
>> Earl
>> ----- Original Message -----
>> From: Bob Richards
>> To: General pattern discussion
>> Sent: Friday, August 01, 2008 3:47 PM
>> Subject: Re: [NSRCA-discussion] Heat Sinks
>> I've been thinking about this, and I think the best way would be
>> sandwich thin pieces of aluminum between the cells and extend past
>> the edge of the pack. But I'm not sure I like the idea of placing
>> anything electrically conductive between the cells. Best to provide
>> an air space between the cells and duct the cooling air between them.
>>
>> Of course, if you really want some wow-factor in the setup, you
>> would have a thermostatically controlled cowl flap that only opens
>> up once the pack starts to go beyond the optimum temperature. Maybe
>> even an emergency cooling system - a small CO2 cartridge from an
>> air rifle might do. ;-)
>>
>> Bob R
>>
>> --- On Fri, 8/1/08, Jay Marshall <lightfoot at sc.rr.com> wrote:
>> The idea of a real heat sink, maybe with the fins as p
> art of the
>> skin of the plane and in the airstream, and the LiPo cell edges
>> bonded to the sink with thermal compound, has some merit and may
>> require some investigation – if cooling is what we really want.
>>
>>
>>
>>
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