The launch had its steam maiden today, brilliant, but think I may have over propped the engine. I got a steam 3 blade prop from prop shop, 2.2 inches dia, the pitch is quite course. The boat has a nice scale speed, with out the engine doing a lot of revs, will try a smaller 55m prop tomorrow with finer pitch, if I get a few more revs from the engine with out it being ridiculous I may go for the standard prop from prop shop, same diameter, but less pitch, think the standard prop is 2.2 dia and 2.2 pitch, whereas the steam prop is 2.2 x 3.0, glad I didn't go for 4 blade. I found that when the engine is running ashore the engine has variable speed right thro the range on the radio control, but in the water the engine did not go any faster after half throttle, thats why I think it could be over propped, not that it is a bad thing, I had good run time. Will post some video and photos next week when I get a chance, on nights at the moment.Any way pleased as punch with the outcome.