7ender:

Indicating the weight of your plane and HOW you want to fly (slow, aerobatic, 3D) will make a big difference in the motor/ESC/battery combination. If you are running a 5x5 prop with this motor you will get on the order of 22,000 loaded rpm and a lots of speed with a 30 to 40 oz. plane. If your plane is heavier or lighter, or if you want to fly slower, you may want to look at other motor options. Look for other people who have tried this particular motor on a particular prop and weight of plane. Use their experience as your testing ground. Otherwise you will need to perform your own motor/ESC/battery bench tests with a Watt meter to get the right prop and amp ratings. Some users on the Hobby City reviews indicate as much as 300 watts on 3 cells and 4.7 x 4.7 props. That translates to 27 amps.

I don't know why Hobby City rates this motor at 34 max amps and then recommends a 20 amp ESC unless these are burst vs. continuous discharge rates. If you draw 34 amps through a 20 amp Chinese manufactured ESC, even for a short time, it is guaranteed to smoke. With Hobby City stuff you should be running 20 amps max through a 35 amp ESC. If their motor ratings are to be believed, stay with the 40 amp ESC especially if you intend to experiment with more aggressive props.

Likewise, the battery data is confusing. The rating says 20-30C discharge rate. If Hobby City means that the battery can be continually discharged at 20C and burst discharged at 30C, then the battery may be more than you need. You might consider a 1800 mAh 3S 20C battery unless you just want the extra weight of the 2250 for longer duration flights. This will provide 1.8 amps x 20C = 36 amps which is more than enough for a motor drawing 27 to 30 amps.

Good Luck
Rick