[BrianG]

If that's the case, then it must be because of the "loaded" value some motors provide. Who knows what load they are using? I suspect at top speed, the motor isn't loaded to anywhere near what it would be if it were using a prop. I really want to get unloaded values for all the motors and adjust the kv ratings accordingly. If I could get that, I'd have the program automatically fill in the motor resistance. All the user would have to do is enter the approximate amperage.

Gotta remember too that the main v drop happens when the motor is accelerating. The faster the acceleration, the greater the draw. At top speed, the motor isn't accelerating anymore, it's just holding that speed and overcoming whatever resistances there are to maintain it, so the current draw (and v drop) isn't as much.