SNS3Guppy,
The practice of loading and then taxiing to the end of the strip, adding copious amounts of power whilst carrying out a sharp 180 degree turn was believed to be the cause of propellor blade shedding accidents in the NZ ag industry.
I can recall getting a memo from the chief engineer to all company pilots to cease and desist from this practice. The chief engineer was responsible for some 30 aircraft at this time, and the results of these 180 turns, on the ground, feeding in large inputs of power just to pick up a few knots at the commencement of the T/O run was proving to be an expensive exercise.
I must admit I did not strip any of these propellors myself and examine them, but the engineers certainly had plenty to work on to form their opinions. The practice was also very tough on the front crankshaft bearing, also due to gyroscopic loading.
Prospector