| I do know how badly that single cylinder engine shakes... One of the twins are much smoother and quieter. It smoking could be because A it's worn out or B it's way over proped or both. Not knowing the age of your boat but if it's old it likely came with a single or twin Lister diesel. Their 8 hp single was 8 horse power at 600 RPM I think it is. That little Yanmar has no hope to match the torque output of the Lister, at the same prop shaft speed. Anyway if you are trying to do this on the cheap I would look at getting a 48 volt golf cart and scavenge parts from it for your drive system. What you are after is push not speed, so a large prop with fine pitch is what you want to look for, I say this because I have no idea what you have now. Most golf cart motors are brushed so you want to gear things so your motor is turning about 80 to 90% of its peak RPM at your cruise speed. The guys in the electric cars have proven many times that it's better spin the motors up to get your power then to lug them at the lower RPM like people drive gas or diesel engines. Electric motors are happy to spin at their rated RPM all day long giving you 70 to 80% of their rated output and will do this for years. It's when you slow them down to 50 to 60% of their shaft speed and ask then to give you that 70% output that causes issues... Anyway I've see others have posted to this. My background comes from electric cars and forklifts. I also know a fair bit about hull design because it's one of a number of hobbies I have. Yes guys I'm a girl that has always been a gear head, because my Dad wanted me to know how to fix my own stuff... I grew up around the fishing and work boats on the west coast of the US as well as old airplanes and old cars and trucks. Kriss --- On Mon, 11/7/11, Dan <daneltravieso@yahoo.com> wrote:
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