Seems I hit a soft spot. 8)
I don't think I said it is "dishonest" I just see it as "slang" or a different way to look at watt.
For instance both the responses above talk about the wattage consumed. In industry we typically speak about the wattage delivered.
Typically for a motor +80% return is considered good. so that can account for some differences.
BLDC motors are considered high efficiency (90% or higher) so that does not explain the difference.
My experiencing with a high watt RC motor. Not so long ago I saw someone with one of these high power watt RC motors spinning a wheel with leds. He had to help to get the wheel spinning going .... (500 watt? well not at stand still for sure.)
As to heat and magnets. Simplified: any motor just dies because it becomes to hot and burns. Heat has influence on the resistance of the wires and on the effectiveness (and life time) of the magnets. If you replace the magnets by the electromagnets you produce more heat to take away the ill effect of heat on magnets and you can increase control over the motor.
As far as I understand: if it was not for heath you could make a 1000 watt motor with a 40AWG wire in a 10 by 10 by 10 box.
It is basically heat that makes the difference between "rated" and "peak" power.
The better the return of investment of the motor the less heat so the less heat you have to dispose off so the closer rated and peak are together.
Assuming a 90% return a 550 Watt rated motor needs to dissipate 55 watt continuously. To be honest I think this is possible in an airplane with the rotor directly attached on the motor. After all when the motor is using power there is a big fan blowing air from a non closed cooling system.
Add to that the BLDC construction (having the wires directly connected to the case) and you'll cool it down enough
But what if I put that same motor to another use that does not have this cooling benefit?
Look at it this way? If this motor really has 550 watt rated why would a mill constructor use a 200$ motor (both without controller off-course)?
Again I am not screaming dishonest or unfair. I just wanted to explain someone to be careful wen comparing figures.
As explained above: I'm not concerned with getting the power in. I'm concerned about getting the heat out in continuous operation.
and their operating time is limited to the battery duration and current capacity of the batteries.
This is a nice example of what I called "slang and habits of a market". You need to be in the RC world (which I'm definitely not) to know that "continuous operation = 1 battery load"
100% fair but not the same "continuous operation" which is used in industry.