Do you have to run your brushless at max rpm

[Losipat]

Have a question on brushless setups... If your motor has a max rpm's of 60k do I need to get close to that to make the motor perform at its best?? Looking to get the most out of motor!!

Could I run a 60k motor around 45k and get the max out of it, just another way of asking.

Thanks

[LarrysDrifter]

No and no. Boats run 25,000-30,000rpm. Kv x voltage gives rpm. Boats are direct drive, unlike land vehicles.

[Losipat]

This is more of a general question not so much directed to boats only.

I understand the whole kv volts... Could I run a 60k motor at 45k and still achieve the best performance of a motor??

[LarrysDrifter]

What vehicle or boat is your question pertaining to? And no, you dont run a motor going by what the max rpm is on the end bell. Your looking at this the wrong way. An example for a land vehicle is a 2200kv motor being run on 6s is ok. In a boat, it is too much rpm and things will burn up.

[Losipat]

Your right.... I'm just trying to see if I can run a lower KV motor under its max rpm's and still get all the power out of it. Neu 1527 1y, 1250kv would like to run it on 8s, I know the rpms are lower then 60k is that ok to do to get all the torque out of it?? Or would turning that motor closer to 60k have more??

Its a car question

[LarrysDrifter]

At 37k rpm, its more of a SAW racing set up. If its for a boat, which you havent specified yet, run it on 6s with an X450/3 prop. Amp draw will be lower and components will have cooler temps in a properly set up boat.

[Losipat]

Its a car

[m4a1usr]

Your right.... I'm just trying to see if I can run a lower KV motor under its max rpm's and still get all the power out of it. Neu 1527 1y, 1250kv would like to run it on 8s, I know the rpms are lower then 60k is that ok to do to get all the torque out of it?? Or would turning that motor closer to 60k have more??

Its a car question

Rule of thumb for most electric motors is as RPM's increase out of peak efficiency range, torque and horsepower decrease. Torque is infinate at 0. The very nuances of our brushless motors also effect motor performance. Idle currents, heat disapation, back current all degrade when outside the peak band. Its a tough sell to convince those who just seek raw power and assume all I need to do is spin a motor faster.

John

[LarrysDrifter]

My guess is that 8s would work then, since you can gear it up and down. Get on www.rctech.com forums for land vehicle info and set ups.

[Fluid]

The theoretical running rpm for that motor would be 37,000 rpm with a light load. Even with no load you cannot run the motor at 60,000 on 8S - you would need at least 12S to do that. The 60,000 rpm limit is usually due to the limitations of the motor bearings - forget about it and focus on the Kv x Voltage value. Running this 8S motor at 25,000 rpm would overheat it quickly, because the lower the loaded motor rpm the higher the amp draw will be. Most BL motors run well at over ~90% of the Kv x V rpm value. SAW motors may run at 80% to 85% of this rpm to put out maximum power. Lower that that and expect the motor to be highly inefficient and to burn the ESC and cells up quickly.


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[Losipat]

The theoretical running rpm for that motor would be 37,000 rpm with a light load. Even with no load you cannot run the motor at 60,000 on 8S - you would need at least 12S to do that. The 60,000 rpm limit is usually due to the limitations of the motor bearings - forget about it and focus on the Kv x Voltage value. Running this 8S motor at 25,000 rpm would overheat it quickly, because the lower the loaded motor rpm the higher the amp draw will be. Most BL motors run well at over ~90% of the Kv x V rpm value. SAW motors may run at 80% to 85% of this rpm to put out maximum power. Lower that that and expect the motor to be highly inefficient and to burn the ESC and cells up quickly.

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Thank you for your post.... Is there that much of a difference in a D wind and a Y wind?

I know this is a boating forum but you guys have a lot of background in making things go fast!! I just don't want to buy 5 motors and find out the hard way. So on 8s I need to stay in the 1800-2000kv range to make the most power with a 60k motor

Thanks agian guys for helping me.