GNHBus,
I know that you've seen the link posted here before. James Lambden at Propulsion marine has collected extensive data concerning his Catalina 30 Kapowai and posted that data online at http://electricboatdesign.com/ . If you look in the "data" tab, James has posted thrust requirements based on measuring the pull while towing his boat. In that table, 100 lbs of pull (thrust) occurs at 5kts. Keep in mind that this is empirical data, not theoretical like the results from the various planning worksheets. Of course, this data is most relevent for Catalina 30s, but other similar boats can probably be extrapolated from James' data. Once a boat has been converted, then specific energy data can be used to derive whether that boat design requires more or less thrust for the same speeds.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, GNHBus@... wrote:
>
> How did you calculate the 100lbs/Thrust ?
>
>
> In a message dated 3/9/2011 2:32:25 A.M. Eastern Standard Time,
> josh@... writes:
>
> I'm in the middle of my conversion. Just a few numbers for you to keep in
> mind when considering whether or not electric will work for you. Numbers
> are for a Catalina 30, which is 10k lbs and change, so about 2/3 your
> displacement.
>
> It takes about 100 lbs of thrust to move my boat through calm water at 5
> knots, or about 3.2KW with the geared system and optimized prop.
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