On a sailboat, the sail is one big wind generator, and so underway it's quite simple to power an in-water generator towed or directly attached to the boat for house battery charging.
Nick
-----Original Message-----
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of Capt. Mike
Sent: Thursday, August 01, 2013 5:24 AM
To: ELECTRIC BOAT GROUP
Subject: Re: [Electric Boats] Re: wave powered
One of the things I would like to check out in regards to wave energy is how much my prop and motor might be able to "harvest" when underway in regen mode from passing waves. It seems to me a wave passing under an EP boat operating in regen should be able to tap into some of that passing wave's energy and pulse it into the battery bank without any new technological additions to the system.
Capt. Mike
Sent from on board BIANKA
http://biankablog.blogspot.com
-----Original Message-----
From: "cnc sales (hanermo)" <gcode.fi@gmail.com>
Sender: electricboats@yahoogroups.com
Date: Thu, 01 Aug 2013 12:22:20
To: <electricboats@yahoogroups.com>
Reply-to: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Re: wave powered
The post was similar to the totally ridiculous, technically impossible (with todays materials science/physics) idea of using gyros to stabilise displacements boats.
Seakeeper is one manufacturer. They work, to a limited level, in planing boats, by using large amounts of energy to run gyros.
They are totally impossible on displacement boats like trawlers, where the enegy budget is larger than the carrying capacity of the trawler.
Note: The manufacturer agrees, and of the 51 systems installed, according to the manufacturer, zero are on heavy displacement boats.
As an example, a seakeeper midrange system is about 50.000 €, uses 4 kw for 20 hours to spin up, and uses 2 kW continuously to run.
Such a system on a midrange trawler, say 50 ft, 30 tons.
Needs 2 systems. Uses 8 kw for 20 hours to spin up.
Needs an extra 10 kW generator to run.
Costs 4 kW or about 5 l of fuel, per hour, 24x7, with attendant space, noise, heating.
Requires about 8 square meters for 2 systems, and an extra 10 kW of capacity, and the extra genny required to run.
Would cost about 150-200.000$ extra on a 600 k$ 50 ft trawler (Krogen, Selen, Nordhavn), using up about 2/3 of usable space, and 1/2 or more of carrying capacity at about 5000 kg in mass, including 2 systems, generator, extra noise insulation, extra engineering (to install gyros in central location and move cusrrent systems, extra cooling for boat (you are inputting 10 kw heat in the boat minus ventilation, 24x7) and coat about 200$/day to run+maintenance, so about 6000$/month + maintenance at approx 15% per year).
--
-hanermo
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