Quote:
Originally Posted by Dasnowz
We have been looking at the Lagoon 420 and it has the electric motors which run on a battery bank and have a genset for charging batteries. In fact as you are sailing and the props turning it regens the batteries on its own.
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As a Multihuller myself , I have always been interested in alternative power to that provided by individual diesel engines in each hull.
My first Catamaran I had built in Brisbane Australia, this had a single 80 Hp diesel engine driving a hydraulic pump which in turn drove a Cesna aircraft hydraulic motor in each hull - these driving folding props.
The the earlier Lagoon 42's when fitted with diesel engines had 2 x 28 hp motors - the equivalent of 2 x 21 Kw.
The Lagoon 420 that you are looking at has 2 electric motors rated at 10 Kw each
(= 13 Hp each) The generator to power the batteries produces only 11 KVA .
Ask yourself what size battery bank will you require to produce 20 Kw for the motors ?
How much electrical power will the propellors deliver when under sail ?
How much drag do non-folding propellors produce?
If the Lagoon is cruised in tropical waters - where the propulsion system will be in use at least
60 % of the time - that generator will have a tough time.
The Lagoon 420 has a lot of windage and at 15 tons loaded - my own experience tells me that
her hybrid system may not be able to cope, when running into strong head winds coming out of a line squall.
However, the concept has merit - even though perpetual motion is still not round the corner
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