I ran them in speed in the early 50s. Never set any records with them and while I did win some smaller contests with them, I ALWAYS got beat by the "big" boys and their McCoys--- DeBolt, Grish, Hall & Massey and a host ofothers. The best I could get out of mine was in the 150 MPH range. If I remember, 9" X 10" and 9" X 12" toothpick props were the thing to start with, then trim to perfection.
Bigiron