[BrianG]

I use whatever KV values are published, loaded whenever possible. In a way I like using loaded kv values and then other ways I'd prefer an unloaded kv value.

Using loaded values helps the result be closer to the real thing. However, it seems like a "fudge factor". I highly doubt we load our motors the same way as whatever method they use to measure "loaded". IMO, the calculated result in the right range, but not as accurate.

IMO, using unloaded values is better.... as long as the motor resistance and amperage drawn is known, both of which causes the kv to drop. This kv drop is more accurate because it is specific to the application you are using it in.