[GriffinRU]

Originally Posted by maxxdude1234

er.....please tell me what part of my post was incorrect? Your post, although correct, had nothing to do with mine. Please, if something I posted was incorrect then explain in what way it was incorrect - don't just say its wrong and don't explain why. Thanks

*edit* when I said "at a given speed both motors will put out the same power", I am refering to the speed of the vehicle they are moving. This might be where the confusion lies

I like your *edit* :)

And then talking about what current which motor will draw at fixed load is less important, right?

Just to get back, where we started, you said:

In theory the two motors will perform exactly the same if geared for the same speed. Acceleration and top speed will be the same. The only difference is the 8XL gets the majority of its power from torque, whereas the 8L gets power from rpm. Basically, power = torque x rpm.

Definately go for the 8XL over the 8L

And before that by (Rtsbasic) :

It has virtually idential resistance to the 8L and can pull the same number of amps according to them feigao rating charts, does this not mean it will be able to pull enough amps to accelerate hard with the steeper gearing for the same top speed as the smaller more revvy 8L?

So, to correct these statements I start my posts. Bottom line - 8L and 8XL cannot produce the same power at given voltage because they have different Kv number based on motor construction. And do not look on resistance because inductance is the parameter what plays the major role in motor efficiency. When you deal with DC motors you look for active and reactive resistance, the last one is dominant and primary depends on motor size, RPM and any parameter responsible for change in frequency applied to motor phases.

So can you get the same power on the wheels from 8L and 8XL with 12 cells, yes you can, but one will be more efficient then another. And both can be tweaked to be at top efficiency, but then one will have higher output then another. That is what I am trying to say in my posts.

I can see how my last paragraph can confuse, but it is all about balance and tweaks.

Artur

P.S. 8L will spin up faster and will have less rotation mass plus weights less then XL.