Thermal Issues with the New Traxxas Spartan

[Brushless55]

yep, lower kv and run 6s

[GeoVW72]

This is what the Inside of the motor looks like. Im sure this guy knows how poles this motor is, lol

So is the consensus to switch to a lower kv motor (leopard 1300kv) if we only want to run 6S?

yep, it's a two pole, I love taking things apart

not sure if it matters, but could the rotor balance be a problem

[djmaincheese]

This is a start and it's not going to break the bank..

http://www.youtube.com/watch?v=2CU2YUfJJ_M

[martin]

I know not many would replace the esc or motor with original Traxxas ones if they had problems with either, But out of interest i asked the price of a spare motor & esc from the UK importer of this boat & couldnt believe the price. Motor £160, esc £220, I can buy the complete boat & radio for £355. Thanks Martin.

[GeoVW72]

Looking over videos and had a thought.
Boats race clockwise, cars race counter clockwise, so most of the videos the boats are turning left.
The fact that the pick-up is on the right side of the rudder in the low pressure cavitation side of the rudder turning left causing no flow in an already poorly flowing system.
Looking at the Spartan front page vid, even in a shallow left turn the limited flow going off the left(right in the video) goes away.

Gentlemen turn your boats to The Right

[Darin Jordan]

Looking over videos and had a thought.
Boats race clockwise, cars race counter clockwise, so most of the videos the boats are turning left.
The fact that the pick-up is on the right side of the rudder in the low pressure cavitation side of the rudder turning left causing no flow in an already poorly flowing system.
Looking at the Spartan front page vid, even in a shallow left turn the limited flow going off the left(right in the video) goes away.

Gentlemen turn your boats to The Right

While I know that sounds like a good theory, in practice, if the rudder is a wedge rudder, the water remains in contact with both sides of the rudder, even in the turns, so this isn't generally a problem. LOTs of rudders have the pickup on the "wrong" side, and have no issues with water flow.

No one answered my question concerning the motor. How many poles is this motor?? Does it have any resistance or "cogging" when you rotate it by hand??

[GeoVW72]

It's a two pole, just one large slug for the rotor. not much cog, but you can tell where the poles are
the balance of the rotor is terrible.



might the force on the bearings also contribute to the heat?

[GP73]

The video is private?

Not sure if this has been posted already, but according to the owner of the boat the ESC went up in flames on the second run...

[Darin Jordan]

If this is a 2-pole motor, then it's simply the wrong motor for the application. NO TORQUE. It's an airplane or car motor...

Need to prop it way down and even then, it's going to build some heat, just like the Nemesis, Ammo, Faigo, etc., have always done.

A boat like this needs at least a 4-pole. All of the AQ and ProBoat stuff, except for the Widowmaker and really small stuff, uses 6-pole motors, which have proven to be reliable, and fast, workhorses, especially for their size.

[Brushless55]

It's a two pole, just one large slug for the rotor. not much cog, but you can tell where the poles are
the balance of the rotor is terrible.



might the force on the bearings also contribute to the heat?

Holly crap that's bad

[djmaincheese]

Looks like this may be the trick to keeping the stock components cool...

http://www.youtube.com/watch?v=L2FODuwKjIE

[martin]

Looks like this may be the trick to keeping the stock components cool...

http://www.youtube.com/watch?v=L2FODuwKjIE

I think an extra water pick up would work better than splitting the single line with the y conector. So you have better flo still to the motor & esc with 2 completely separate lines each with their own pick ups. Thanks Martin.

[Darin Jordan]

I think an extra water pick up would work better than splitting the single line with the y conector. So you have better flo still to the motor & esc with 2 completely separate lines each with their own pick ups. Thanks Martin.

I agree with Martin... Splitting a single supply of water to two components like that isn't helping much. You need to double the supply, not split the existing one, even if it's slightly improved.

Is the MOTOR in these actually getting hot, or is it just the ESC? What kind of temps are people recording?

Run the water through the ESC FIRST, then to the motor, would also make sense.

Pick up an AquaCraft SV27R water pickup or similiar and add it on as a second source of water.

Still all just bandaids to the real problem, but should help a little.

[Steven Vaccaro]

I agree that a second pickup should be the first place to start.
http://www.offshoreelectrics.com/pro...prod=ose-80410

I do not agree that the motor needs to be switched out at this point. Of course it can and will make a difference, but for those that do not want to spend the money, try changing the cooling and the when trying 6s I would not run huge mah packs. The longer you run, the higher the heat build up.

[martin]

How good are these silicon jackets over the aluminium ones that gives more heat disipation with aluminium ones purly through better conductivety of heat. Ive got one of these silicon jackets that was fitted to a leopard 4074 motor, All be it a different make to the Traxxas one. Ive not run this motor or cooler so cant coment on useing it but looking at the design of the internal water ways its very restricted in as much as that it has several quite small water channels molded in to it. Its not just one big open area inside the jacket as aluminium ones are + silicon dosnt disipate heat very well. I definately wouldnt buy a silicon jacket over an alloy one. Thanks Martin.