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Skaldiddog's "Progress"

HH Mini's Chillin' Out

ROWDY RACING said:
What's the weight on this setup Joel?
Click to expand...

7.5oz per side sub axle, outer margin 0.063" inboard of wheel plate lug head bases. Low and wide.

Update:

Jake said "Way to overcomplicate a skid". This is a mock up shot. You be the judge.



They were monotonous as hell to make. Several hours of standing and going back and forth in 0.020" Z increments. But I think they look awesome. They weigh exactly 4.88g each. I attached them to the FETS with small drops of goop.












I'll goop the plate portion of the sinks to the skid and that will dump more heat to the skid. As with all engineering, progress is the art of comprimise. Overall I've accepted a <15g increase in chassis weight in order to improve the performance of my electronics. The smaller motors lack the raw nads of big ass 540s but they are worth the weight loss. I'm fine trading some weight to get more of that power back. Hopefully the rocks dry off tonight so I can test. Otherwise I'llwill figure out on Saturday if they are worth the weight. I bet they will be. I'll pull some "resolution point" side-hills and that will tell me if my COG has been raised to the point I can tell a difference.

J
 
Thanks for the weight.

:shock: Your a madman, those heatsinks came out great! "thumbsup"
 
Do you think that tall of a fin is necessary? My micro pros look to be about half the height, and I have them meshed together. Interesting concept, as my escs never get very warm, even running pack to pack with no break. I know some who removed sinks and had heat issues. I was to worried about crawling here when its 110
 
Erin said:
Do you think that tall of a fin is necessary? My micro pros look to be about half the height, and I have them meshed together. Interesting concept, as my escs never get very warm, even running pack to pack with no break. I know some who removed sinks and had heat issues. I was to worried about crawling here when its 110
Click to expand...

Probably not. It's easier to trim them down later than make new taller ones. The additional weight of 0.200" taller pins is negligible. I'm guessing SWMP heat sinks may have a larger footprint. These are 1.020' x 0.750" with 2 corners (0.250" square) removed. Your cool SWMP's are a testament to heat sinks. I ran many pairs without sinks and they all got hot and turned"soft" after 6 months. Inter-meshing the sinks somewhat defeats the purpose but that's good that it's working for you.

Cheers,

J
 
You are probably better off with smaller fins and a little fan on each side....moving air off them is more efficient than a big fin. Another good option is to actually make a plate from copper that the heatsink attaches to....copper against the fets. Copper transfers heat better than aluminum....

For your mount to the skid with them, I am guessing you are trying to get additional cooling with it. Look at the computer nerds stuff, they make a tape last I saw that is thermally conductive and could be used on CPU to heatsink. It may work for your application, plus it prevents current from transfering.

Just ideas, neat to see some tech going into the esc stuff....running hot isn't good.

Later EddieO
 
EddieO said:
You are probably better off with smaller fins and a little fan on each side....moving air off them is more efficient than a big fin. Another good option is to actually make a plate from copper that the heatsink attaches to....copper against the fets. Copper transfers heat better than aluminum....

For your mount to the skid with them, I am guessing you are trying to get additional cooling with it. Look at the computer nerds stuff, they make a tape last I saw that is thermally conductive and could be used on CPU to heatsink. It may work for your application, plus it prevents current from transfering.

Just ideas, neat to see some tech going into the esc stuff....running hot isn't good.

Later EddieO
Click to expand...

Hey Eddie,

Agreed, fans would cool way better but I'm not going that route. Thanks for the tip on the copper. Not sure I want that weight though. I'll consider it. Thanks for the tip on the tape. I am looking for the sink base plates to transfer heat to the skid (along with the side of the boards directly). I can get a way with a few 0.001' of goop holding these parts together so I think I'm going to get OK heat transfer. As warm as the skid was when only one esc was in contact with the skid via only the cap and a little of the back of the board, I think this system will do better. Thanks again for the help man.

J
 
You will be pulling heat off big time with those pretty things! I doubt further work will be needed to keep them running cool.

Copper does work great as a sink, it has twice the thermal conductivity of aluminum. The same weight of it has much less thermal mass than aluminum, and with the same shape would have less surface area to shed heat. Actively cooled systems can benefit from it when there is a size constraint that doesn't allow a large enough alloy sink, but to gain cooling there is a weight and cost penalty using copper.

One good commercially available insulative thermal tape is Kapton. Industrial grade stuff would be 3M 8805. I recommend an epoxy over tape because it would not hold all the dirt that worked in like a tape would.
 
Now your body will hold in the shed heat. :ror:

Time for more swizz chezzin, or a body less cab. :mrgreen:
 
JohnRobHolmes said:
You will be pulling heat off big time with those pretty things! I doubt further work will be needed to keep them running cool.

Copper does work great as a sink, it has twice the thermal conductivity of aluminum. The same weight of it has much less thermal mass than aluminum, and with the same shape would have less surface area to shed heat. Actively cooled systems can benefit from it when there is a size constraint that doesn't allow a large enough alloy sink, but to gain cooling there is a weight and cost penalty using copper.

One good commercially available insulative thermal tape is Kapton. Industrial grade stuff would be 3M 8805. I recommend an epoxy over tape because it would not hold all the dirt that worked in like a tape would.
Click to expand...

Thanks JRH. I'll keep you posted on temps data.

J
 
Just a suggestion and it could be completely wrong, But could you get reasonable heat dissipation by mounting the ESC's to the TVP plates of the chassis.
 
Could you then utilise the chassis plates as your heat sinks, by mounting the ESC's vertically against them. You would need a bit more wire but it may reduce the need for the heat sinks.
 
Highlucks said:
Could you then utilise the chassis plates as your heat sinks, by mounting the ESC's vertically against them. You would need a bit more wire but it may reduce the need for the heat sinks.
Click to expand...

I thought about that but I could never find an orientation that I felt would keep them out of harms way to my satisfaction. That's also a bit higher up than I want them. The TVP would pull heat but I think my sinks and skid will pull a bit more heat. We just woke up and you're about to head to bed I'm assuming. That always trips me out.

J
 
Joel, not shure if you are familiar with pc heatsinks. I think a thinwall copper tube ran across the frets and to the outside of the heatshrink would suffice for cooling the mini br. So you would have the copper tube contacting your skid on the bottom and ran outside the shrinkwrap on the top. This would allow you to still smash them small. In all it would take 2 tubes per esc. ran across the frets and arctic silver them to the frets. Maybe 3/16 or 1/4 thin wall copper tube. Just a thought about them, and may give it a try. I do not think it will take much to get them cool. Little info on the form factor.http://www.aavid.com/product-group/heatpipe/transport
 
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