Not sure you'll get much info on that one from anyone other then the Rum Runner guys. It's a pretty new motor. If I knew what Hacker it corresponded too I could give you a better idea. The problem is the RPM's per volt are a little different then the Hackers since lehner puts them under a partial load when they do the dyno, thus I can't cross reference it for you.
I do know a few people who have the 1930/6 Lehner which is 3483 RPM's per volt. That isn't too far off from the 3600 you have. These guys have been running the Y535 prop on 8 cells. I'd try that for starters on your O mono. If you have to step down, I'd try the x632.
Go a little bigger for N2 since it's fewer cells. Something like an x637 or a Y536.
Then again, if it were me I'd just drop Don Wollard a line and ask him. He may have a few other good tips too.
Good Luck,
Dick
