I have one on an a20- but my name is Matt. Top end is 41, although I really don't care about it as I don't have to travel from launch to riding area. I run the stock tanks, mushroom sac in bow, and 2x750's in rear. I need to add the bow sac, as it takes a little to plane- but not much. Without wedge and full tank/sac weight- no problem. The big difference is the rpm's.
I made a thread with 2 vids, but at 20 or 22 with full ballast/wedge I believe the rpms were at 3100. Many of the 4 blades were up near or over 4000rpm, so you save a little gas and wear on engine.
Let me know if you have any questions on it. Here's the original post with a couple short vids
viewtopic.php?f=14&t=202&hilit=5+blade&start=10