Originally Posted by roydor
By how strongly the model pitches up I decide if I can spiral down under power and then shut off the motor, gaining some F5J points, or throttle up to get more altitude if itís too light an air.
Just to clarify a point -- Under F5J rules you will not gain any points by spiraling down under power.
Your launch height is defined by the highest altitude reached from launch until 10 seconds after motor shut off.
Spiraling down under power would not be advantageous.