RE: eflite power 15 question
Using a larger than required ESC is fine and is not the cause of your problem.
Have you checked the battery voltage to be sure it is fully charged? Batteries are not usually fully charge when you purchase them, so if it is a new battery, you should charge it first.
The symptoms you describe sound to me like the low-voltage cutoff (LVC) is kicking in. The LVC is designed to cut off power to the motor if the battery voltage gets too low. I can think of a couple of reasons why this might happen.
1. The battery is not fully charged. You could have a bad battery or a bad charger, or you forgot to charge the battery. Check the voltage. A fully charged lipo should measure 4.2V per cell. So a 3-cell pack will measure 12.6V when fully charged.
2. The battery capacity or C rating is too small for the motor/prop you are running, causing battery voltage to sag below LVC when you throttle up.
3. The LVC setting of your ESC is incorrect. Example: You are running a 3-cell battery but LVC is set for 4 cells.
What battery and prop are you using with this setup?
If you can't solve the problem, consider going back to the store where you bought the equipment and asking for assistance. Take everything with you - plane/motor/prop/battery/radio, etc. - so you can demonstrate what is happening.
- Jeff