Re: [Electric Boats] concept for an electric houseboat

 

For electric propulsion you will run the largest diameter that will fit. Slip calculations have to take so many variables that yes, I just threw 12% out there. Since a electric will produce full rated torque at 1 rpm, a strong pitch will not stall the motor like it would an ICE. Bob --- On Fri, 5/4/12, Keith Jacko <nrixez@yahoo.com> wrote: From: Keith Jacko <nrixez@yahoo.com> Subject: Re: [Electric Boats] concept for an electric houseboat To: electricboats@yahoogroups.com Date: Friday, May 4, 2012, 8:37 PM Yes, that's straightforward with the exception of the slip built in.  Do you always factor in a 12% slip? Also, none of that takes into account prop size, which I assume will increase the torque of the motor.  Torque x rpm = power, so given an efficient rpm for a motor and the power rating of the motor and controller, I can figure out the available torque the motor can put out.  If I could relate that to the prop size then I could calculate the optimal prop size.  Or does it not work quite like that? Thanks, -keith --- On Thu, 5/3/12, Robert Lemke <robert-lemke@att.net> wrote: The Parsun will be a 10 hp, not 10 Kw. Determine prop shaft rpm and pitch for speed desired. If shaft speed is say 2200 rpm X 4" pitch = 8800" per minute X 60 = 528,000 inches per hour / 12 = 44,000 feet per hour / 5280 = 8.33 mph X 0.88 slip = 7.33 mph, easy, huh? Bob ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to:     http://groups.yahoo.com/group/electricboats/ <*> Your email settings:     Individual Email | Traditional <*> To change settings online go to:     http://groups.yahoo.com/group/electricboats/join     (Yahoo! ID required) <*> To change settings via email:     electricboats-digest@yahoogroups.com     electricboats-fullfeatured@yahoogroups.com <*> To unsubscribe from this group, send an email to:     electricboats-unsubscribe@yahoogroups.com <*> Your use of Yahoo! Groups is subject to:     http://docs.yahoo.com/info/terms/

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