The thicker the heatsink; the better;the larger the heatsink the better. I will do a test this weekend using your setup and post the results.

Another factor: Are you going to use thermal compound (heat sink compound) between the resistor and the heatsink? This will effect the heat transfer.

 

I was planning to mount them to a 5mm piece of aluminum along with a dab of thermal paste that comes with CPU cooling fans.

NZ951.......from what I can see of your pic there are 4 resistors there, I thought only two were needed??

 

Yes there are 4, they are sequential...

 

Good afternoon NZ951!

Please clarify what type of Computer controller you are using.

 

Hey beab,

I have a feeling I may owe you money for a favour? Maybe posting me something from ages ago? Any ideas?

I am not using a computer controller as such, I may not be answering your question here... I am using a stand alone Link Plus computer.

 

You are correct..and I don't care. You contributed so much in such a shiort amount of time... I am very impresed.

 

Damn it! Sorry PM me your paypal address and I will send you the money right away. Really sorry Brian, I am not sure what triggered me thinking that all these months later! Just let ,me know how much...

 

I would say we are even. no worries.

I really want to climb in that part of the world .What a wonderful explosive part of the world you live in.

Back on the subject, I will post the results for Dave ASAP.

 

Yeah Mt Cook is a sweet climb... also the Able Tasman is a good few day track... you seen info on that?

 

http://www.backpack-newzealand.com/nz/article36.php

 

Thanks for the links.

 

Brian, I doubled checked and the resistors are mounted on a 2 1/2" x 3 1/4" x 1/8" plate now, I can go up to a 4" x 5 1/4 x 3/8" if that would be better.

Do I need heat sink paste ?

Thanks for your help,

 

No worries, Able is just a great few day easy walk to get you into it. The snowy mountain southern ranges are amazing. But too many idiots are getting caught out in conditions they were not prepared for.

 

NZ951 We have a couple of serious climbers (+27K) in our grourp. I think they are nuts but go figure,

Dave, I will do the tests and get back to you. Bottom line is bigger is better.

 

David.........are you going to solder or use spade connectors?
IMHO the 1/8" looks kinda skimpy.......I am planning on using 5mm aluminum sheet. Are you going to mount the heat sink aluminum to anything, or does it just "float" around in there?