Well unfortunately the speed secret of leaving one blade on the ground is no longer legal in pylon. I was racing Formula One at a contest up in Washington state back in the 80's. During the engine start-up as I was tuning the engine for a heat, a part of one blade left the prop at around 22K on the tach. The engine picked up another 1000 rpm, and much to my caller and my surprise did not vibrate much worse than the normal ST X-40. So rather than take a zero, I decided to go ahead and fly the heat.
That airplane had always been a dog, but with the modified blade and a half prop, it ran the course 4 seconds faster than the plane's best time. That prop got removed after the heat to be studied away from inquiring eyes.
Unfortunately, a bit later I told another buddy about the "experiment". He promptly submitted it as a rule change that both blades had to be of equal size. Which was fine, since I already had a number of rules in the books that were written after other "experiments". I may hold the record there.