Is it the same amout of torqe in every xl motors
 

I wonder in a feiago 8xl is there the same amount thats there is in an 12xl?

Yet again this depends on battery voltage. If both motors are geared to produce the same speed and are in the same vehicle with the same batteries, you would have to gear the 12xl higher than the 8xl and it would load the battery and esc more. The 8xl will draw more current, than the 12xl will if they are both spinning the same rpm. The 8xl is generally run with 4 or 5s lipo, and the 12xl would be good with 6-7s lipo. They will have similar output (watts), but the higher voltage system will draw less current (amps)

Both motors can produce the same amount of torque. But the 8XL needs more amps to reach the same level as the 12XL. The 8xl has fewer winds and thus generates a weaker magnetic field when feeding the same Amps. Theoreticaly a 2500kv motor will need twice the Amps as the same motor with 1250kv to generate the same amount of torque.

Great explanation othello. You nailed it!

but can i gear the 12xl 50% harder than the 8xl?

in theroy, i guess then you're back at even torque levels at the wheels.

No, you can't. You can get away with slightly higher gearing with a given motor rpm, because it will handle the higher loads better because of less resistance losses, but not much.

If the 12XL is running at a lower rpm, then you could most likely gear it up more than you could if they (8XL and 12XL) were running at the same rpm, which again depends on your voltage.


The only way the same size motor could have twice as much torque would be because it would have twice as many electrical poles (coils).

I like to look at it, like camshafts in real engines. As you drop winds its like going up in duration, so while most specs are the same it raises the torque peak a bit. The added winds don't really add torque, if anything the added resistence will drop torque a bit. The reason for more winds, is to move the torque lower and the added wires will help disapate heat

Well, it will increase the 'stall torque' a bit because of the very high currents, of which is basically limited by your power supply (batts).

Actually, the more turns you have, your torque constant goes up proportionally, and you have the same amount of copper in your coils, just a different configuration (higher wind is a longer strand of thinner wire, but the same amount of copper... yada, yada, your torque is determined by your voltage, the copper wind resistance, and the inductance of the winds) for a given motor.

Sorry ZPB, I meant move the torque point, not increase