Torque and RPM Graph for Castle Creation products ?

[Mister-T]

Hello

I remember that I've read Mr Del castillo saying that during CC motor developpment they were doing Dyno testing.

I wonder if it's possible to release few graph of dyno testing to know of much N.m and RPM the Mamba max and Mamba monster combo can spit on a given battery ? That would be a good for a comparison vs Nitro.

Or mybe it's secret because you don't want competitor to know about that

[What's_nitro?]

Well as far a torque goes, versus nitro there is no comparison. The torque potential of an electric motor (brushed or brushless) far exceeds the torque output of a nitro engine with a comparable HP rating.

I would also be interested in seeing the graphs if they are available. It would help in choosing the right setup for a specific application.

[Pdelcast]

Is that what you are looking for?

Please note that our dyno is a Magtrol -- reports about 5%-6% lower efficiency than hobby dynos.

This is the Castle/Neu 1515/1Y - 2200Kv at 16V input

[What's_nitro?]

Nice looking graph you got there! Are the other motors' graphs available on the site?

[Mister-T]

Great exactly what I was looking for. Thank you

I still do have question.
Is the green curve RPM/Torque this linear in the lower rpm ? (I'm thinking in low and mid range like 5000- 15000 RPM )

[What's_nitro?]

Originally Posted by Mister-T

Great exactly what I was looking for. Thank you

I still do have question.
Is the green curve RPM/Torque this linear in the lower rpm ? (I'm thinking in low and mid range like 5000- 15000 RPM )

Torque output isn't represented on that graph. Only RPM and % Eff. There would be a third trace if torque was on there. I'm guessing the motor was kept under a constant load.

[Mister-T]

For people willing to compare

http://www.rc411.com/forum/showthread.php?t=2202

[Mister-T]

Originally Posted by What's_nitro?

Torque output isn't represented on that graph. Only RPM and % Eff. There would be a third trace if torque was on there.

Ah ? I believe that the green curve is the Torque output for a given RPM value. As far as I know One can't go without the other.

[What's_nitro?]

The graph is representing % Eff. Vs. RPM. In this case power output is not really a concern and thus torque isn't specified. You are correct in that the motors do produce specific torque at speed but it didn't pertain to this test. In the top right corner of the graph you can see the trace legend. The RED line is % Eff. and the GREEN line is RPM only.

[Mister-T]

Originally Posted by What's_nitro?

The graph is representing % Eff. Vs. RPM. In this case power output is not really a concern and thus torque isn't specified. You are correct in that the motors due produce specific torque at speed but it didn't pertain to this test. In the top right corner of the graph you can see the trace legend. The RED line is % Eff. and the GREEN line is RPM ONLY.

Ok my bad, I was mislead by the presence of the Torque charts below.

Looks to me like the torque is left to right on the graph.Which means the more load they put it under the lower the efficiency went.Which is to be expected. Looks like it reached about 34 oz/in of torque,with no rpm fall off.But it was down to 50% efficiency.Now if we only had the same graph for every other motor we could interpret some results.

[Pdelcast]

Green is RPM, red is efficiency, and the graph is for Torque -- the graph goes from 0 oz/in to 35 oz/in from left to right.

So, to find RPM and efficiency at a given torque, find the torque on the bottom, and follow the line up for RPM and efficiency at that torque.

Please note that this graph is for 16.0V only.

[Pdelcast]

Originally Posted by asheck

Looks to me like the torque is left to right on the graph.Which means the more load they put it under the lower the efficiency went.Which is to be expected. Looks like it reached about 34 oz/in of torque,with no rpm fall off.But it was down to 50% efficiency.Now if we only had the same graph for every other motor we could interpret some results.

No, the efficiency is the red line -- so at 34oz/in of torque, it was still at 84% efficiency.

Green is RPM, so the RPM was down to around 32500RPM

The 50% efficiency point is at around 240oz/in. (if my memory is correct)

This graph is a little misleading because at the right most point the motor is only outputting 1.21 horsepower. But we use this type of graph to do comparison testing between motors to determine if the motor iron is saturating early. A nice flat graph from left to right is the goal.

[BrianG]

And if a measly 34oz-in of torque sounds low, remember that torque is amplified by the gearing. So, if the total gear ratio is 15:1, the torque then becomes 510 oz-in (2.65 ft-lbs). And at the 50% efficiency the 240oz-in torque multiplied would be 3600 oz-in (18.75 ft-lbs)!! Compare that with nitro engines who can maybe reach the 2.65 ft-lb mark at maximum. Nitros beware!

[brushlessboy16]

Now do you guys see why i love mine