On a 3s lipo battery you would destroy the motor with the drag on it. To understand KV is like understanding the turns on a motor the higer the KV the faster it Motor For Washing Machinewill be, but the less torque it will have. Saying that the 3900KV would be faster in a truck on 3s and as theres more torque it would handle it better. With the old electric motors (brushed motors) they were rated in turns e. The KV ratings above are based on 1/10 scale motors, the same rules apply for all other scales the only changes will be the KV ratings on the motors.uk/en/65-motors-and-escs.xnitrorc.g.3900kv x 7. To get the heat down you would have to add a larger spur gear and a smaller pinion gear.In brushless you get turns mostly on the 1/10 scale motors China Motor For Cooker Hood Suppliersand kv ratings on all the motors, if it is not displayed on the motor the manufacturer will display the kv rating
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