On Nov 20, 6:19*pm, Bruce wrote:
On Sat, 20 Nov 2010 19:20:11 +0000, Justin C





wrote:
In article , Bruce wrote:
On Fri, 19 Nov 2010 23:34:40 +0000, Justin C
wrote:

quote
* *The GREEN MOTION system eliminates fossil fuel used by sailing
yachts in any way. Electrical energy is generated with the system and is
stored in batteries (lithium Iron Phosphate are optional). It will
generate sufficient energy to be used for propulsion, hot water, cooking
and all electrical equipment and navigation on board. When batteries are
fully charged or high speed is required (race) the lifted Motogens
eliminate the drag from the propulsion system and this increases the
speed of the yacht (between 5 - 15%).

* *Retractable Motogen
* *The electric retractable Motogen is new, light
weight, extremely efficient and better than any propulsion system ever
designed for yachts. Usable in all sailing yachts from 30 to 90 ft (9-30
m): monohull, catamaran or trimaran). Installation can be made inside
the hull in a monohull or on a retractable arm for multihull. 5 years of
extensive testing has been done with a ‘proof of concept’ sailing in
excess of 10.000 Nm.
/quote

URL:http://www.green-motion.com/

I suspect that the estimates of *drag versus speed for the generator
propeller is highly optimistic. The best estimates I can find are that
the drag from a 3 bladed prop reduces speed by about 15%, not the 5 -
15% mentioned.

They put a small amount of current through the motors as the same time
as using them to generate, this partially compensates for the drag -
according to last month's Yachting Monthly feature.

* Justin.

Perhaps I'm a cynic but it sounds like pie in the sky.

Of course if they put a small amount of current through the device,
i.e., power it, it will result in less drag. But of course it also
results in less net current generated.

Frankly it sounds very much like a perpetual motion machine.

Cheers,

Bruce- Hide quoted text -

- Show quoted text -

If they did not have sail energy input I would agree. But a full set
of sails in a nice breeze can generate massive amount of power input.

Joe