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I have a buddy with a 21 ft. 1974 Pen Yan Explorer. It's a typical 'motorboat'... had an inboard gas v-8 engine.
Design goals are just to cruise an hour or two under power at moderate speeds, no need to pull waterskiers or travel for hours under power.
What I am wondering is if anybody has any ideas what kind of power is needed to hold a boat like this at a moderate cruising speed. I'm looking for some realistic numbers so I can have a decent idea for battery capacity needed per hour of cruising time.
Does anybody have any charts showing power vs speed for a typical v hull motorboat?
Preliminary design would use:
ADC 8" series wound motor
zilla 1k controller
120vDC x 100ah battery pack
I know the 8" motors can air-cool at continuous output around 15-20hp, so I might have to consider a water jacket to help cool the motor for higher continuous loading.... but I would hope to avoid that in any case because it would drain the battery pack too fast.
I'm basing this on my experience with this equipment in a Suzuki Swift.... where the motor is pretty happy pulling 200amps or less to keep the car at 60mph. I just don't have much information on what it takes to cruise a boat like this at a moderate speed.
Design goals are just to cruise an hour or two under power at moderate speeds, no need to pull waterskiers or travel for hours under power.
What I am wondering is if anybody has any ideas what kind of power is needed to hold a boat like this at a moderate cruising speed. I'm looking for some realistic numbers so I can have a decent idea for battery capacity needed per hour of cruising time.
Does anybody have any charts showing power vs speed for a typical v hull motorboat?
Preliminary design would use:
ADC 8" series wound motor
zilla 1k controller
120vDC x 100ah battery pack
I know the 8" motors can air-cool at continuous output around 15-20hp, so I might have to consider a water jacket to help cool the motor for higher continuous loading.... but I would hope to avoid that in any case because it would drain the battery pack too fast.
I'm basing this on my experience with this equipment in a Suzuki Swift.... where the motor is pretty happy pulling 200amps or less to keep the car at 60mph. I just don't have much information on what it takes to cruise a boat like this at a moderate speed.