[Electric Boats] Amp draw vs speed for 37ft sailboat with 10 ft beam, displacement 13,000 lbs

 

I completed my conversion a couple of months back and am loving it.  It's time to start sharing what I've learned.  ;)  

I've collected data during a couple of outings under relatively calm conditions (65F, 5-10 kt winds), and I used excel to generate a trend line and a formula (using a power series if you're into math) that provides a pretty reliable estimate of how much speed I can expect for a given amp draw.  This is really easy to do in excel and if anybody needs help I am happy to show how to do it.   Here's the formula (keep in mind the formula would be different for a boat with different characteristics than those in the subject line of this post):

Speed (in kts) = 1.3728 X Draw (amps) ^ 0.2704

Some examples: 

At 20A, my speed would be about 3.1kts.  

At 40A, my speed would be about 3.7kts.  

At 50A, my speed would be about 4.0 kts.  

And at 100A, my speed would be about 4.8 kts.

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Posted by: armyofpenguins@gmail.com

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