Endbell Heat Sink

[monojeff]

Seams this is an area that would really be worth while spending some time developing something to keep the heat down on our motors for P-spec setups.
We are all pushing the limits on the motors but if cooling could be better they would last so much longer!

Thanks for the link to the fans, how are you guys connecting these to your power?

I think the real heat from these comes when we are finishing a race and the boats are waiting to be brought in so maybe even a small pump would do the trick to keep the temps from spiking??

[Alexgar]

Jeff I plug mine to the rx so it uses the bec off the esc

[properchopper]

Seams this is an area that would really be worth while spending some time developing something to keep the heat down on our motors for P-spec setups.
We are all pushing the limits on the motors but if cooling could be better they would last so much longer!

Thanks for the link to the fans, how are you guys connecting these to your power? I think the real heat from these comes when we are finishing a race and the boats are waiting to be brought in so maybe even a small pump would do the trick to keep the temps from spiking??

One boat it just plugs in to the esc power input with a servo-type plug soldered on, another I have a switch to connect it to the wires.

DSC03429.JPG DSC03431.JPG DSC03430.JPG

[longballlumber]

Seams this is an area that would really be worth while spending some time developing something to keep the heat down on our motors for P-spec setups.
We are all pushing the limits on the motors but if cooling could be better they would last so much longer!

Until a racer figures out that a cooler motor means they can run more prop... Not many are interested in making the motor last longer when they are consistently getting beat because the guy beside him is going faster...

Later,
Mike

[monojeff]

Well last longer and be able to be pushed harder.
It's not just a matter of bigger prop the right prop cupped can make a fair amount of heat also.

[Shooter]

One boat it just plugs in to the esc power input with a servo-type plug soldered on, another I have a switch to connect it to the wires.

Probably the best way to get power (directly).

I've been running my lights on my planes off the balance port of the battery. Can't remember where I found the connecters, but they are nice to have.

Hey Mike - aren't you one of those 'guys that is going faster'.

[properchopper]

Probably the best way to get power (directly).

I've been running my lights on my planes off the balance port of the battery. Can't remember where I found the connecters, but they are nice to have.

Hey Mike - aren't you one of those 'guys that is going faster'.

That's a great idea, hadn't thought of it. I'll see if I can source out some connectors

[longballlumber]

Hey Mike - aren't you one of those 'guys that is going faster'.

What?!?!? I am just a dude trying to keep up with the fast guys!

Later,
Mike

[Shooter]

Unfortunately, the original source I had for the JST XH connectors ran out. Here is a similar one (also on ebay).....

I usually just solder onto the pins that I need and then clip the others flush on the back side. Don't pull the pins you don't need out, they mate nicely with the pins on the battery side and help secure the connector. Oh, also.....quick heat on the pins when soldering or the connector will melt (very thin wall). Learn from my mistakes!

http://www.ebay.com/itm/10set-2-5-XH...item2a211ce01d

[ray schrauwen]

Is it sucking or blowing..... tee heee....

Seriously!

While I would rather poke myself in the eye with a sharp stick than start another granfalloon-fest on spec motor compliance issues, I thought I might suggest a solution that "some guy" uses to address the over-excited electrons in the endbell and wire entry thermal choke-point. Yes, sports fans, there's no supply of fresh air inside a sealed hull, but according to a law of thermodynamics that I just made up, air accelerating out of the fan is substantially cooler than the residual trapped air.

[ATTACH=CONFIG]82045[/ATTACH]

[ray schrauwen]

There is a lot of truth in this statement. I keep a little note pad listing what props I can run based on water temps/conditions.

I need to do this because I fried 2 UL-1s at that Canada race... hadn't run in 90* heat in years...

[Shooter]

Well, here is another option. It slip fits over the OD. Setscrews keep it in place. Still worried about clamp load against the endbell, but rules are rules. If we can't fasten to it, there aren't too many options other than clips or springs.

Not sure how effective the water lines will be. Probably more or less just a heatsink.

Sleeve3.jpgSleeve4.jpg

[properchopper]

Well, here is another option. It slip fits over the OD. Setscrews keep it in place. Still worried about clamp load against the endbell, but rules are rules. If we can't fasten to it, there aren't too many options other than clips or springs.

Not sure how effective the water lines will be. Probably more or less just a heatsink.

[ATTACH=CONFIG]82440[/ATTACH][ATTACH=CONFIG]82439[/ATTACH]

Nice design The fins will heatsink nicely, but I suspect the cooling tubes won't have a big effect due to the limited contact area with the casting. What may be more effective is to enclose the fin area and have it become a fully filled chamber which would likely require a 2-piece design. Whether clamping to the motor violates the "as delivered from the manufacturer" stipulation is a point to be mulled over (& I basically shy away from such discussions leaving the call in the hands of our NAMBA FE chairman)

FWIW the P-Lts Sport Hydro race in D19 Saturday (water and air temps were SUPER HOT) went well for me with my fan-cooled UL-1 motor pulling my normal prop.

DSC03440.JPGDSC03441.JPG

You could say that I'm a Fan of the Fan. Simple to rig, cheap, and effective

(It was hard to accurately heat-gun the motor temp since by the time I un-taped, the fan had cooled down the endbell. I was able to run four heats on the same motor however.)

[longballlumber]

I was able to run four heats on the same motor however.

Hey Tony,

I find your comment above interesting. What is the "typical" life of a Aqua 2030Kv motor your seeing? It seems (by the comment) that you've been going thru them often?

Later,
Mike

[properchopper]

Hey Tony,

I find your comment above interesting. What is the "typical" life of a Aqua 2030Kv motor your seeing? It seems (by the comment) that you've been going thru them often?

Later,
Mike

Mike,

In the NAMBA-legal non shrink-enhanced config, the D19 guys here in L.A. seem to be a little overbearing on props (like M445's) which are the minimum props to be locally competitive. Thus, a few races and the insulation at the endbell entry heat choke-point starts to melt.

Then there's those like Tyler who runs a 440/3 on his PT, Brian, Darin, that stator-friendly Guy in the Southeast and the HOTMBC folks that finess their setups way better than us "still learning" SoCal guys, resulting in more motor longevity.