i was wondering what i could use as propulsion for a 9'-10' catamaran.
what kind of rpm and torque do i need? can i use those gardentool engines? weight would not be the problem...or do they have a low rpm?
what about waterjet? if i understood well i need an engine that runs a pump... what specs do i need in this case? any links?
thanks. matthias
Sails?
Choice is small prop,fast rpm. Large prop, slow rpm. Torque means nothing, especially when you ask a question like "What sized engine will power a boat"
Google?
Post your displacement, LWL, expected speed and I'll find my old marine engineering books and tell you how much power you need.
If you try asking your question on rec.boats.building, someone on there sometime back pointed me to a site with an online calculator which will fill you in with the details. I no longer have the site bookmarked, but I remember vaguely it had something to do with an engine marinising company.
Sorry it's a bit vague!
Gary
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