I've admired the Pretorien35 for years and think they are a great cruiser and very well built. I bet you're pretty good in metric now! I looked at the Alpha site today and may dig a little deeper based on your comments. It would be nice if they posted the manual or a little more detail. What kind of drive unit do you have? Is the control unit waterproof and cockpit mounted or do you have it below and use a remote? How does the disengaging drive pin work? How's their customer service? Thanks, David