once you get a displacement hull moving ( or any really without getting into an argument over planing/making waves isn't more speed etc) a bit like a train, it takes way less to keep them moving than it did to get it there.
Hear hear !
The old rule was much less Hp per ton, half the figure mentioned.
As you have managed, succesfully, at 0.2 kW/ton, I personally believe
the old rule of (between 1/2 to 1 Hp per ton) is much more appropriate.
Thus somewhere between 300-740 Watts/ton, or about 500W, is likely a
good option.
(10m) Sailboats with 12 Hp auxiliaries manage perfectly well.
Thats about equivalent to a 3-4 kW electric solution.
On 13/03/2014 16:41, Carter Quillen wrote:
> I have been pushing a 20 ton boat with a 7 kiloWatt peak motor,(.35
> kW/ton) that I almost always operate at 4 kiloWatts, (.2 kW/ton) for
> almost a 1000 miles now. It is fair to say it's a bit slower than most
> people would want but it works for me and I've always been able to
> maintain control of my boat, albeit in slow motion sometimes, even in
> some pretty adverse conditions.
--
-hanermo (cnc designs)
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