One of the benefits of an electric outboard is the simplicity, relatively speaking, of reversing the rotation of the motor instead of using a reverse gear, which requires more complexity for shifting. Unfortunately many outboards will NOT work if you reverse motor rotation direction while in forward gear. The design of some lower units, when motor rotation is reversed, will not drive the prop, they will just slip a clutch not designed for reverse. I can't tell you which ones work this way, just test any candidate motor. Put it in forward gear and turn the prop in both directions. If turning the prop in both directions turns the motor in both directions, you have a candidate. I have had a Suzuki and Mercury that would not lock and a Johnson that would, but I would make sure you test whatever candidate comes along. Also, don't arbitrarily limit yourself to any max HP. I found a 50HP motor that had the advantage of power tilt and it was cheap. The down side being it was quite heavy. In my case it did not matter, the boat had the space and buoyancy. A 50HP lower unit with a 12HP electric motor is not likely to ever wear out. Another up side of a bigger motor is the ability to use a larger diameter prop that has a small pitch. My configuration is a 5KW motor using 48V pushing a 3000 pound flat bottom river boat. Can't tell you about performance because it is not yet finished and in the water. Good hunting!
I'm going to be looking for a junk outboard to use for an electric-repower project soon.
The end result needs to be a 3Kw or 5Kw 48V setup that will power a 3,000 sailboat hull that will be used for extended river cruising at 4-6 mph.
I know that I'll need a larger than the normal 6 to 9.9HP that would normally power this boat to ensure durability of lower end components with the torque of an electric.
What is the range of long-shaft outboard "cores" I should consider? I would imagine 15 at the lower end as big as they make a long shaft at the upper end, but would appreciate any input.
Are there some types or brands that lend themselves to electric conversion better than others?
Thanks.
Greg Murphy
-- The greatest art is to shape the quality of the day ― Henry David Thoreau
Posted by: Yahzdi <yahzdi@pointroberts.net>
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