Prolonged static running (i.e., on the ground with the plane tied down) at full throttle is quite hard on the power system. A lot of nice motors have been damaged when doing this due to overheating. Even when there are no obvious signs of damage, such as smoke, even one overheating episode can permanently weaken the magnets in the motor so that it never again delivers full performance.

I try to keep full throttle static running to 30 seconds or less. That is plenty of time to measure the motor current with a wattmeter, which tells you what you need to know.

- Jeff