P-Limited Motors - Im going to jump on the hot seat.

[Darin Jordan]

I am with Tony! Where is too far, the burn up point.

Not interested in that info, Randy. I'm interested in peak power output and ability to hold up under higher than normal loads. THAT is what I tested.

I tested these at 100A, for 60-seconds, WITHOUT any water cooling. All of the P-LTD legal motors came in at under 150-degrees. A typical P-LTD run in a 1-mile race is around 2:00, give or take. (well, for my P-LTD OPC, it's more like 1:30, but ... ). With water cooling, I'm pretty sure any motor that survived my testing will survive the heat.

EVERY Electric motor can be pushed to some limit, but testing this small sample of them wouldn't really tell us anything other than what THIS particular sample motor could hold up to. Would the next? I'd need a lot more motors to find that out.

Did you test the 3662 2000Kv? A lot of the guys in district are running them in stock PB boats.

You'll have to be more specific on the brand, etc. Not sure what a "3662 2000KV" means.

[rayzerdesigns]

Didn't I just say that above ? : "(given that D19 holds to the original NAMBA list of approved motors)"

Probably better said as " given that D19 has presently decided to continue to hold .... " OR better yet : "since D19 hasn't added any updates to the approved list......."

BTW the first SCSTA/Nitro ( with a new name) will offer PLSH & PLC on Sun 1/24/16

I will be there tony.. When are they gonna post the classes??

[Doug Smock]

The FLAME-OUT Test :let each motor run under load until the smoke comes out with the timer running. See which one will survive the longest

That would be valuable information for the "stator bakers" among us. With proper planning they would never be just one motor shy of getting through a weekend of racing or a Nationals.

We certainly appreciate your time and trouble on this Darin. Thank you sir.

[trigger]

A lot of hard work and lots of good data, thank you. Wish we got to the happy ending, but, at least we have the facts. Again Thanks

[RandyatBBY]

You'll have to be more specific on the brand, etc. Not sure what a "3662 2000KV" means.

This is the one.

http://www.rcchiefhobbies.com/Parts/Dynamite-2000Kv-6-Pole-Brushless-Marine-Motor-36x62mm.html

[Darin Jordan]

This is the one.
http://www.rcchiefhobbies.com/Parts/...r-36x62mm.html

Randy, Yes... that was tested. Look at the data under "DYNM2000". It got over 234-degrees on the 60sec @100A test.

[TheShaughnessy]

If all the motors relied on air cooling but some have vented endbells and some don't would that affect ∆H significantly?

[Darin Jordan]

If all the motors relied on air cooling but some have vented endbells and some don't would that affect ∆H significantly?

Maybe if the vents were exposed to the airflow, but as you can see by the picture below, the prop adapter shields the front of the motor. Due to the size of the props, the motors ran in the "calm spot" of the airflow. Eye of the storm, so to speak.

20151203_202233.jpg

[TheShaughnessy]

That's the pic I wanted to see, thank you.

[Darin Jordan]

That's the pic I wanted to see, thank you.

I tried to be as "scientific" and keep everything as controlled as possible. Hopefully most see these tests as having been conducted in a fair and unbiased manner.

[zooma]

Is the tested Dynamite 1500 motor this one?

http://www.horizonhobby.com/a3630-15...motor-dynm3835

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[Darin Jordan]

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Yes. That's the only one available these days. And, that picture is wrong...

[Darin Jordan]

Yes. That's the only one available these days. And, that picture is wrong...

I just put in a request with Pro Boat/Horizon Hobby to get the website picture updated. They have submitted the request.

[TheShaughnessy]

I tried to be as "scientific" and keep everything as controlled as possible. Hopefully most see these tests as having been conducted in a fair and unbiased manner.

I appreciate the trouble you went through. A while back I was trying to figure out why some of my batteries would show a full charge but wouldn't power a boat for more than 30 secs. I put a 5x5.5 on a 1515 1y which generated about 60 amps and put a watts up meter in line so I could watch the voltage. The point there is that the sound of an airplane prop spinning that fast is a bit scary in and of itself. I believe you did a great job with the report of how you conducted the experiment and how you put everything into a spreadsheet for easy comparison. I'm sure a fair amount of time went into that alone.

I was expecting the dynm 2000 to fair a bit better because of the slightly larger can size so that's why I asked about the endbells. It doesn't appear biased to me at all. I can remember you talking about 1500 kv motors since 2011 and probably before that.

[zooma]

Yes. That's the only one available these days. And, that picture is wrong...

Well, I just ordered one . So I guess that I'll get the right motor, but it will look different. I was thinking of your thread on the Impulse V3, where you switched to the 1500. The one in your picture looks like the one on the Horizon site.