Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-04-2014, 16:15   #31
Registered User

Join Date: Jul 2013
Location: Annapolis, MD, USA
Boat: Menger 19' Catboat
Posts: 248
Re: Magnetic Drive

Quote:
Originally Posted by zerompg View Post
Wouldn't this just replace the sail drive and motor in one step?



I drive a Nissan Leaf hence moving to all electric is more a shift in mindset than impossible.
You still have a big, honkin' hull penetration, which is what the OP was trying to avoid.

It still would make more sense to me to just glass the rim-drive unit into the skeg or rudder and provide the juice via a diesel.
__________________

__________________
Ukeluthier is offline   Reply With Quote
Old 12-04-2014, 16:23   #32
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Grand Rapids, Michigan
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 3,450
Images: 83
Re: Magnetic Drive

Quote:
Originally Posted by jongleur View Post
Somebody in another thread mentioned the necessity
of a shaft through the hull for an engine.

Has anyone attempted to build a neodymium magnetic
drive coupling? They are damn strong magnets. One on
the inside and one on the outside. No hole.

Comments?
We (and probably many or you) have these on small magnetically isolated pumps. I have at least 6 on board. They are not practical for large power transmission and are insanely expensive.
__________________

__________________
Nicholson58 is offline   Reply With Quote
Old 14-09-2016, 10:22   #33
Marine Service Provider
 
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 1,137
Re: Magnetic Drive

Quote:
Originally Posted by zerompg View Post
Wouldn't this just replace the sail drive and motor in one step?



I drive a Nissan Leaf hence moving to all electric is more a shift in mindset than impossible.
What was the name of that unit, if you recall??
...and/or a weblink in english were it might be found??
__________________
Brian Eiland
distinctive exploration yachts
beiland is offline   Reply With Quote
Old 14-09-2016, 10:35   #34
Marine Service Provider
 
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 1,137
Rim Drive

I've been a fan of these rim drive units for some considerable time,...and as propulsion units rather than just (bow) thrusters.
Section 8 and Rim Drives
Quote:

http://www.runningtideyachts.com/dynarig/index.php
Rim-Driven Propellers: Instead of propulsion blades being attached to a central hub and propeller shaft, they are rooted to the rotating inner rim of a circular nozzle type unit. The rim is electrically driven with a permanent magnet motor, where the motor windings are in the stator and where the rotor has a number of permanent magnets. The electric motor is an integral part of the 'propeller nozzle'. These units are cutting edge technology. First came the rim-driven thrusters, and very soon the rim-driven propulsers.
There are lots of pluses to recommend this new technology:
  • Smaller diameter than prop counterpart at equal power densities
  • Can be tucked close under the hull skin for less draft and more keel protection
  • No constraints as to location as with shafted props…can be located forward,…away from transom pitching
  • Rim-drive unit can be contained in its own 'waterbox', & accessible, & serviceable without hauling the vessel
  • Waterbox mounting would allow for partial retractability in shallow waters…full retraction under sail.
  • Less noisy
  • Less susceptible to fouling lines
  • Potentially safer for divers and marine life
  • No reduction and direction gearboxes required, instant fwd/reverse !!
  • Phenomenal maneuverability, joy-stick operable (gamefishing plus, plus)
  • Exciting New EPS Thruster (& Propulsion) - Boat Design Forums
I was hoping we would be much further along with the technology by now, but I think the world wide pleasure boat market 'depression' since 2008 has held things back considerable.

Exciting New EPS Thruster (& Propulsion)
Exciting New EPS Thruster (& Propulsion) - Boat Design Forums
__________________
Brian Eiland
distinctive exploration yachts
beiland is offline   Reply With Quote
Old 14-09-2016, 10:54   #35
Marine Service Provider
 
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 1,137
Sea Jet's RIMJET, Advanced Electric Ship Demonstrator

Quote:
Originally Posted by Ukeluthier View Post
While pure electrical propulsion isn't ready for prime time in cruising boats mainly due to limitations in battery technology, there is no such limitation for diesel/electric hybrids that don't rely on a huge battery bank. A big advantage would be that the unit could be driven from either the main propulsion diesel or a genset.

As to attachment, the logical approach for a fiberglass boat would be to have the housing molded as a unit with the skeg or whatever part of the boat is the logical mounting point. The electrical lines could then be all internal.

Not saying that such an installation wouldn't require some outside-the-box thinking or very sound engineering, but it appears do-able and more practical than a magnetic drive with a conventional prop.
Maybe something like this?





Sea Jet's RIMJET, Advanced Electric Ship Demonstrator
__________________
Brian Eiland
distinctive exploration yachts
beiland is offline   Reply With Quote
Old 14-09-2016, 10:59   #36
Registered User

Join Date: May 2012
Location: Central California
Boat: Catalina 30
Posts: 873
Re: Rim Drive

hp"]Section 8 and Rim Drives[/URL]

I like it. Thanks.
__________________
Bill
...........................................
You can't buy happiness, but you can buy ribeye.
jongleur is offline   Reply With Quote
Old 14-09-2016, 14:01   #37
Marine Service Provider
 
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 1,137
Re: Magnetic Drive

I thought these were nice features also..
Quote:
  • Rim-drive unit can be contained in its own 'waterbox', & accessible, & serviceable without hauling the vessel
  • Waterbox mounting would allow for partial retractability in shallow waters…full retraction under sail
__________________
Brian Eiland
distinctive exploration yachts
beiland is offline   Reply With Quote
Old 15-09-2016, 12:40   #38
Marine Service Provider
 
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 1,137
Re: Magnetic Drive

Quote:
Originally Posted by zerompg View Post
Wouldn't this just replace the sail drive and motor in one step?


Can't seem to find that unit? Perhaps it was some product by
http://rotorque-jet.de/defaultsite
but that link goes to a default page.

I did just find this reference on another forum
360 rotate sail drive - Boat Design Forums

They refer to it as a Torque-jet unit,...apparently from Germany,...and possible still in development, although it appears that company website has been taken down,...and the utube presentation along with it.
__________________

__________________
Brian Eiland
distinctive exploration yachts
beiland 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hydraulic-magnetic and Magnetic Overcurrent Circuit Breakers chrysm Electrical: Batteries, Generators & Solar 4 17-03-2014 00:13
For Sale: Leyland 1.6lL Diesel, Borg Warner Velvet Drive Transmission, and Walter V-Drive Journeyman Classifieds Archive 0 03-03-2011 16:19
Magnetic Refrigeration no electricity needed SeaKing Plumbing Systems and Fixtures 37 11-11-2007 10:07
Magnetic Induction Cooktops Lodesman Provisioning: Food & Drink 15 11-03-2007 19:26
Earth's Magnetic Pole Drifting Quickly CaptainK Polar Regions 0 09-12-2005 23:59


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:38.


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.