I use a B&S 630 in my SD1 as direct drive and want to improve the power as my next project.
Current are the dates: max cruise speed is is about 100mph at 3600rpm
With the current prop, there is the max rpms at 4500 and this is my destination
with best regards
Welcome to the forum and congratulations on your SD-1! How has the engine been running? How many hours on it?
What modifications are you planning? I like Tipi’s data-driven approach, so my initial focus will be on getting base-line info on the stock engine.