The 1 KW per ton is a good recommendation for most boats up to 40 feet long, If we look at the model of displacement to power level you will find that most boats achieve between 5 and 6 knots at 1 KW per ton. For most boats, a 5 to 6 knot motor is a capable machine for the task at hand.
As boats displacement increase, so does power requirement. However as a boat gets longer, it becomes easier to push the boat per ton. This is why waterline length and displacement are part of the formula.
What is more important than choosing a generic rule is to look at the conditions that the boat will be operating in. In Santa Barbara it is perfectly acceptable to operate at 1 KW per ton. We have perfect winds on a broad reach coming out of the harbor and over to the islands, with very little current.
If my boat were to be operating in a 4 knot current, I would need to have a 10 or 12 KW system to be able to make 3 knots against a 4 knot current.
It is so important to design a boat for how it is used. The fact is for the vast majority of all sailing, electric boats can easily deliver the power required and the range necessary.
Heavy weather sailors, sailors navigating in river currents or against tidal flows should double or triple the 1 KW rating.
Building a boat for how its used is why the electric boat industry is enjoying this renaissance
Keep letting us know your success stories and reasons why you love electric.
For the Earth,
James
James Lambden
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
The Electric Propeller Company
625C East Haley Street,
Santa Barbara, CA
93103
805 455 8444
james@electroprop.com
www.electroprop.com
On Mar 27, 2014, at 3:30 AM, fitloose wrote:
In my last post I mean Eric makes some good points, Bob....
Opps!
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