When I'm looking at a motor and it says it is a 250 watt motor what does that mean to me? I'm assuming I need to be sure my battery is able to put that many watts out without damage to the battery. From what I have gathered this means I need to be sure the battery has the needed C rating for discharge. Again I assume the C rating for discharge is calculated the same as the rating for charging. So a 500mah 3S battery with a 20c constant discharge rate puts out 111 watts ( (amps x discharge)volts = watts) based on the many assumptions I have made already ( ) the 250 watt motor I mentioned at the start would destroy this battery. Please let me know how far off these assumptions are. The lack of this knowledge is officially stunting my growth in the hobby at this point.

Is there a way to calculate the amount of time a given battery will run a given motor under a given amount of stress? The point here is to get a rough idea of how much time I can spend in the air. Every time I get a new plane I have to set everything up and run the battery for a short period of time and check the battery voltage. Doing has so far given me the information I need in time, but if I can narrow the time frame down a little more with math before I hit the flying field my time spent there would be much more productive.