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Discussion Starter #1
Hello All,

I tried to search the archives with no success and was wondering if
there is a sort of stock or off the shelf heat sink that would work
with a Curtis 1221C. I would like to stick with just air cooled but
perhaps with a shroud and fan.

The Wakefield extrusion 5384 in about a 12" length seems to be just
about right but I don't know of any sources for just that small
amount. I emailed them for a source and haven't heard back yet.
That was over a week ago.

Also, any suggestions for mounting would be appreciated.

TIA,

Chet



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Discussion Starter #2
I've scored some pretty nice heat sinks on Ebay if you don't mind a few
holes drilled from a previous application.

----- Original Message -----
From: "Chet Fields" <[email protected]>
To: "EV List" <[email protected]>
Sent: Tuesday, September 18, 2007 9:31 AM
Subject: [EVDL] Curtis Heat Sink Source


> Hello All,
>
> I tried to search the archives with no success and was wondering if
> there is a sort of stock or off the shelf heat sink that would work
> with a Curtis 1221C. I would like to stick with just air cooled but
> perhaps with a shroud and fan.
>
> The Wakefield extrusion 5384 in about a 12" length seems to be just
> about right but I don't know of any sources for just that small
> amount. I emailed them for a source and haven't heard back yet.
> That was over a week ago.
>
> Also, any suggestions for mounting would be appreciated.
>
> TIA,
>
> Chet
>
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #3
Randy at www.canev.com sells a Curtis heat sink designed to fit nicely
into a Geo Metro. You might be able to find a spot for it in another
vehicle a well.

Bill Dennis

Chet Fields wrote:
> Hello All,
>
> I tried to search the archives with no success and was wondering if
> there is a sort of stock or off the shelf heat sink that would work
> with a Curtis 1221C. I would like to stick with just air cooled but
> perhaps with a shroud and fan.
>
> The Wakefield extrusion 5384 in about a 12" length seems to be just
> about right but I don't know of any sources for just that small
> amount. I emailed them for a source and haven't heard back yet.
> That was over a week ago.
>
> Also, any suggestions for mounting would be appreciated.
>
> TIA,
>
> Chet
>
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
>
>

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Discussion Starter #5
Chet Fields wrote:
> wondering if there is a sort of stock or off the shelf heatsink that
> would work with a Curtis 1221C... The Wakefield extrusion 5384 in
> about a 12" length seems to be just about right but I don't know of
> any sources for just that small amount.

It used to be that heatsink manufacturers kept short lengths of
their various extrusions in stock. You could order (say) a 4-foot
piece and cut and machine it to your desired specs yourself. This was
a quick and easy way to do prototypes or one-offs.

But lately, all the ones I've talked to have stopped doing this.
EVERYTHING has minimum orders and long lead times. Yes, they have
distributors; but they only stock the little "toy" heatsinks.

I've had better success going to surplus outfits and buying either a big
old heatsink, or some piece of junk equipment that has one on it and
salvaging that. Be aware that even these don't last long, because the
scrap value of aluminum is high.

--
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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Discussion Starter #6
> Chet Fields wrote:
> > wondering if there is a sort of stock or off the shelf heatsink that
> > would work with a Curtis 1221C... The Wakefield extrusion 5384 in
> > about a 12" length seems to be just about right but I don't know of
> > any sources for just that small amount.
>

I recycled a rust bucket of a Saab EV with a Curtis controller. The Curits was mounted to a piece
of quarter inch aluminum plate, about 12" by 16". If you don't need significant cooling, and you
can keep a good flow of air over the back of the plate, this might work for you.

Dave Cover

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Discussion Starter #7
I got a heat sink for a 1231c from http://www.thermaflo.com. They were very
helpful on the phone assisting with the right sink for my application, and
cut it to length. They have a very large selection, and provided quick turn
around. I believe the US distributor is in Texas if I recall correctly.

One thing to bare in mind is the type of convection required for your
application. In my case, I chose to use a natural convection style as
opposed to forced convection as I had no intention of blowing a fan over the
sink.

The heat sink style I chose was
http://www.thermaflo.com/bin/cr_exdatasht.pl?Pnum=e1387&LengthUnits=in&ExLength=3.00.
It met all of my requirements for size and natural convection, and as
important, provided enough thicknes at the base to machine mounting holes
for the controller.

Not cheap, but the right part for the right job.

Regards, Mike

Mike Harvey
Harvey Coachworks and EV
(877) 841-9730
[email protected]


----- Original Message -----
From: "Lee Hart" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Tuesday, September 18, 2007 2:54 PM
Subject: Re: [EVDL] Curtis Heat Sink Source


> Chet Fields wrote:
>> wondering if there is a sort of stock or off the shelf heatsink that
>> would work with a Curtis 1221C... The Wakefield extrusion 5384 in about a
>> 12" length seems to be just about right but I don't know of any sources
>> for just that small amount.
>
> It used to be that heatsink manufacturers kept short lengths of
> their various extrusions in stock. You could order (say) a 4-foot
> piece and cut and machine it to your desired specs yourself. This was
> a quick and easy way to do prototypes or one-offs.
>
> But lately, all the ones I've talked to have stopped doing this.
> EVERYTHING has minimum orders and long lead times. Yes, they have
> distributors; but they only stock the little "toy" heatsinks.
>
> I've had better success going to surplus outfits and buying either a big
> old heatsink, or some piece of junk equipment that has one on it and
> salvaging that. Be aware that even these don't last long, because the
> scrap value of aluminum is high.
>
> --
> Ring the bells that still can ring
> Forget the perfect offering
> There is a crack in everything
> That's how the light gets in -- Leonard Cohen
> --
> Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net
>
>
>

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