It is interesting to note that your average speed increased by less than one knot when increasing your power from 1000 watts to 2000 watts. Thanks. Steve S.
--- In electricboats@yahoogroups.com, chris Baker <chris@...> wrote:
>
> Hi again
>
> I left out some details...
>
> motor is a Torqeedo Cruise 2 running at 24 volts. This is the standard Torqeedo prop which 12 inch dia and 10 inch pitch running at 1250 rpm at full speed.
>
> cheers
>
> chris
>
> On 11/07/2012, at 1:39 PM, chris Baker wrote:
>
> > Hi James
> >
> > Funnily enough I am just working on that for a solar boat that I am just commissioning now. It is 1 tonne and waterline is around 18 ft
> >
> > I've pasted the data below... lets see if it shows up after this message is filtered through Yahoos system.
> >
> > Cheers
> >
> > Chris
> >
> >
> > Upstream
> > Power
> > Downstream
> > Power
> > Average
> > 0
> > 0
> > 0
> > 0
> > 0
> > 2.1
> > 250
> > 4.6
> > 250
> > 3.35
> > 2.8
> > 500
> > 5.1
> > 500
> > 3.95
> > 3.3
> > 1000
> > 5.6
> > 1000
> > 4.45
> > 3.7
> > 1500
> > 6.0
> > 1500
> > 4.85
> > 4.0
> > 2000
> > 6.3
> > 2000
> > 5.15
> >
> > <solar boat speed.png>
> >
> >
> >
> > On 11/07/2012, at 1:19 PM, James wrote:
> >
> >> We are working on building a range calculator and could use some help from the members of this group.
> >>
> >> Please send your numbers for knots to watts.
> >>
> >> We are asking for how many watts it takes to power your boat at 3,4,5, and 6 knots in calm conditions, no wind, no waves, with an average of two runs in opposite directions to average out the effects of any tides or local currents.
> >>
> >> Please let us know voltage and current, the meter you measure with, the system you are using, and the propeller and reduction gear ratio.
> >>
> >> Thanks to all who participate in this gathering of data.
> >>
> >> Happy Sailing and Thanks!
> >>
> >> James
> >>
> >> Propulsion Marine
> >>
> >
>
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