I am new to this list and hope that you may give me some suggestions.
I am starting a new project to build in wood-epoxy a 42' Bruce Roberts Spray (18 ton displacement with a 14.5' beam) sail boat to cruise through retirement.
I plan to use a Chinese freestanding lug rig and an electrical auxiliary motor that will recharge while under sail. As I look at various motor options I find their pricing all over the board and limited data provided. A couple questions that I have for anyone who has converted to an electric boat (particularly a sail boat):
• My thinking is a large prop with a high pitch turning slow may be more efficient while under power and for recharging while under sail. From your experience, How large should the prop be for a 42' boat with 18 ton displacement?
• What should the speed of the prop be?
• What experience have you had with reduction gears or reduction belt assemblies?
• What are some good sources of reduction units (to add torque and reduce speed from the motor to the prop)?
Thank you,
Gene
Hood Canal
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