Wednesday, July 11, 2012

Re: [Electric Boats] Knots to Watts

 

Here are my numbers for a 1967 Starcraft aluminum utility, 15' x 5' [14.2' water line], 800 lb displacement, Torqeedo 4.0R outboard, Torqeedo high performance prop, 8 kwh LiFePO4 [16 x 160 Ah].


0.2 kw 3.0 kn
0.4 3.9
1.0 5.5
2.0 7.4
3.0 9.1
4.0 10.4

These are averages of multiple runs, no current, little wind during Sept. 2011. The boat was running in a semi-planing state. That is why you do not see the sharp knee at hull speed, 5.1kn. 

Ned


On Jul 11, 2012, at 12:55 PM, David Elderton wrote:

 

Here are my numbers for a Hobie 16 Catamaran, converted outboard with Mars ME0907, 2:1 gear ratio to Torqeedo cruise 4.0 prop. 48 Volt GB lithium pack.  Weight as tested 800 lb.  Measured with high current cycle analyst.
 
3 knots 223 watts
4 knots 396 watts
5 knots 660 watts
6 knots 1440 watts 
10 knots 5000 watts
 
Dave E
 
 


__._,_.___
Recent Activity:
.

__,_._,___

No comments:

Post a Comment