This past weekend at Southern Fried Combat at the Dixie Nationals I finally gave up on running the 2" plastic spinners. They work well to keep the engine from getting damaged in a dirt nap but they take too long to make a prop change during a match. It took almost three minutes to clean out the bolts, get them out, put on a new prop and get the spinner bolted back up. Compare this to about 30 seconds for a machined prop nut and you have the difference between getting in the air and scoring or sitting on the ground watching the streamers all get cut off before you can get back up.

For practice combat I'll use the plastic spinners but for competition I will use the spinner nuts.