Hypothetical question about kv, gearing, and performance

[xokia]

Originally Posted by Jmann841

This is what I am waiting for. Please, provide such evidence so I can learn something new or reaffirm what I have previously learned.

People ARE trying to explain it to you you just aren't understanding it. The problem is you are looking for information that affirms what you think and disregarding information that goes against it. You aren't going to learn this way. Well maybe you will, everyone learns differently. But I suspect you are going to have to bottom out at what you are doing wrong on your own before excepting what others are saying.

[Jmann841]

Originally Posted by simplechamp

So I'm looking at a certain motor, and trying to decide which wind to get. Gearing will be adjusted to provide approximately same max headspeed with either wind. Voltage and all other aspects of heli will be the same.

470kv at 44.4v, 8.9 gear reduction, approx. 2300 max calculated headspeed
560kv at 44.4v, 10.7 gear reduction, approx. 2300 max calculated headspeed

As I understand it lower kv motor trades some speed for increased torque, having more "electrical gear reduction" so to speak, while the higher kv has more speed and less torque, but will be using more mechanical gear reduction.

Given this basic info, is either setup preferable over the other? Will they perform about the same? Or is there too much more at play to determine based only on kv and gear reduction?

So after all this, to answer your original question.

If both motors are exactly the same construction and design except for the winding style to achieve the KV, you should choose the higher KV motor if you are after performance.

As you can see with the chart below, the higher KV motor will have much more power and torque.

The caveat to all this is, if the motors are built differently, all this goes out the window and you need to get the specs from the manufacturer.

Here's a chart comparing the same motor run at different voltages (Same effect as the the same motor wound at different KV run on the same voltage)

http://www.scorpionsystem.com/files/...data_chart.pdf

We have an answer!