Re: [Electric Boats] Knots to Watts

 

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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