Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 18-10-2009, 22:16   #1
Registered User
boat_alexandra's Avatar

Join Date: Aug 2009
Location: grenada
Boat: bristol 27
Posts: 2,493
Propulsion System without Propellers

I think it would be interesting to connect a high power electric motor to the tiller which can then scull the boat propelling it. To allow for more propulsion the rudder size might need to be increased as well.

An interesting aspect is the fact that once motorized the boat essentially has an autopilot, and the same system can be used to generate power (under sail) but slowing the boat down.

The requirement is a computer processor with digital gyroscopes so that rudder movements are made in frequency and time to the waves and boat motion to give propulsion. If fish do it, maybe it is better? At least it would be quieter.
boat_alexandra is offline   Reply With Quote
Old 19-10-2009, 06:00   #2
Registered User
Fishspearit's Avatar

Join Date: Jan 2006
Location: FL
Posts: 576
Considering all of the views and no responses yet, I may be the only lunatic on here who agrees with you.

The shaft driven propeller may be the best thing that we have come up with so far, but it requires a lot of energy. Nothing in nature propels itself that way.

The idea of a fin like a fish or whale uses would probably require much less energy, although it will never be able to push a boat at planing speeds. My vague, untested idea that I'd love to model someday is to use a ferrous arm connected to a large flexible fin. An electromagnet and a counter spring to move the short radius back and forth, giving the end of the fin a longer sweeping motion. It could be powered with short electrical pulses to the magnet. The idea being that with short dc electrical pulses it might be able to propel a long,narrow boat at a couple of knots using very little electricity.

Like I said, I'd love to build a small model and see if it works.
Fishspearit is offline   Reply With Quote
Old 19-10-2009, 09:22   #3
Registered User

Join Date: Oct 2005
Posts: 340
Send a message via Skype™ to gosstyla
Ever seen Hobi kayak's fin drive?
gosstyla is offline   Reply With Quote


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
Autostream Propellers - feedback? Weyalan Propellers & Drive Systems 35 02-01-2016 15:06
Flex-O-Fold Propellers vs Kiwi allsail68 Propellers & Drive Systems 87 06-06-2015 17:53
Anti-Fouling Propellers Chief Engineer Propellers & Drive Systems 6 27-09-2009 22:05
electric propulsion system peter.bomberg Multihull Sailboats 19 12-12-2008 18:26
Inboard Propellers? Gallivanters Propellers & Drive Systems 3 23-08-2006 20:51

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 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:26.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.