I had a chance to do some testing with the B Y&O 14x4, and 13x6 on my Saito.72 in my Sledge. Both props worked well, but performed different. The 14x4 had good pulling power, and would hover at 1/3-1/2 throttle. It had very good braking qualities, and spins seemed better. The 13x6 had better vertical acceleration, and would hover at a lower throttle setting. It was hard to get the airplane slowed down for landing. I think the 14x4 will be a good choice for most flying, but the13x6 will help on windy days. I look forward to a longer test period to try all the props back to back. Tom