Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-07-2008, 17:20   #46
Senior Cruiser
 
sandy daugherty's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: near Annapolis
Boat: PDQ 36 & Atlantic 42
Posts: 1,178
Lets talk about the carbon footprint of a regenerating system like Dave Tether's (ex Solomon Technologies) electric wheel. IIRC, The Conser 47 with ST motors shown at the Annapolis Show in 2003(?) could be set for a 6 kt 'cruise' so that when a gust increased boat speed the motors would generate electricity instead of using it, for a net gain for the day. How does that fit the footprint accounting approach?
__________________

__________________
sandy daugherty is offline   Reply With Quote
Old 02-07-2008, 18:29   #47
Registered User
 
Amgine's Avatar

Join Date: Dec 2004
Location: Vancouver BC
Posts: 1,384
Images: 1
All of the electric wheel motors are set up to do this. The idea is to set the motor at a speed just slightly less than the average through-the-water speed, which will use a small amount of electricity but reduce drag (three-blade fixed prop) to near zero. And, of course, as you get a gust or slide down a wave you generate electricity (with an equally momentary increase in drag from the prop.)

As far as the carbon footprint, this is a great method. I do not know what the embedded energy cost of an electric motor of this type might be, but I would guess it would be comparable with that of a diesel motor or perhaps slightly higher (more complexity, but softer metals if it's copper windings.) However, in electrical generation mode it has to be considered that the total carbon footprint of the boat, rig, and sails have to be added in - they are part of the generation equation. This is in contrast with either the solar panels or the diesel, each of which produce energy without requiring the boat.

But without the boat, what's the point of the electricity?

The idea of combining the electrical generation with the motive power is why a diesel is so convenient. This actually makes me consider the idea of switching to an electrical drive.

But not until my current power plant packs it in.


__________________

__________________
Amgine
Blog

On the internet, nobody knows you're a dog anchored in a coral atoll.
Amgine is offline   Reply With Quote
Old 06-07-2011, 06:03   #48
Registered User

Join Date: Jul 2011
Location: Crystal River, Fl
Boat: Prout, Snowgoose, 37
Posts: 48
Images: 7
Re: New Tecnologies?

What about using a gulf cart motor as an aux. power source? How well will they work? Have you tried it?
__________________
jphillips48 is offline   Reply With Quote
Old 06-07-2011, 07:56   #49
Senior Cruiser
 
sandy daugherty's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: near Annapolis
Boat: PDQ 36 & Atlantic 42
Posts: 1,178
Re: New Tecnologies?

Golf Cart Motors are very old technology and are used for their ease of service and reliability and not for their efficiency. I think I read that they are too inefficient for even home made water turbine generators where there is ample continuous flow. But there has to be a lot of them laying around. Soft metals, cheap castings, stamped steel plates and the fact that you might be using one that has been rewound are all positives.
__________________

__________________
sandy daugherty is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 09:50.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.