This is MERELY a Mental Workout

Discussion in 'Propulsion' started by mgriffin, May 1, 2009.

  1. apex1

    apex1 Guest

    Sure mate! I follow Mikes threads since the very first post now (and there is a regular PM traffic too), and was never bored to contribute, or reply to even the most "out of the way" thoughts.
     
  2. shugabear
    Joined: Jul 2009
    Posts: 20
    Likes: 2, Points: 0, Legacy Rep: 17
    Location: alabama

    shugabear jr member

    if you could work out a proto type even in the one hundreds scale that would be something to see i think its a great idea 21st century
     
    1 person likes this.
  3. FAST FRED
    Joined: Oct 2002
    Posts: 4,506
    Likes: 105, Points: 0, Legacy Rep: 1009
    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    A friend once came close to your idea , but his was for power generation.

    In NYC the tides run strong , so his experiment was to power a reefer while at anchor.

    He obtained an auto front wheel mounted on a spindle , and bolted it to the dock. Then he obtained about 100ft of old (free) fire hose , and made flaps the width of the hose and about 2 inches wide of 1/4 ply/

    The flaps were drilled to be sewn to the hose every 6 inches or so.

    Simply dropping a continuous loop of this hose over the bare car wheel and the stream tension stretched it out.

    The little flaps stuck out into the current leaving the wheel, and folded flat for the return trip.

    When the tide ran over 2K the force of the spinning car wheel was very strong , hard to stop from spinning with mere foot force.At 4K it was really impressive!

    Sort of sails underwater , but for a different purpose.

    Sorry to say he did not finish the experiment although he did obtain an old wind generator head , and drilled a Hockey Puck to ride on the wheel rim, like a bike generator. Winter set in , free cold in the food locker.

    FF
     
    1 person likes this.
  4. yipster
    Joined: Oct 2002
    Posts: 3,487
    Likes: 93, Points: 0, Legacy Rep: 1148
    Location: netherlands

    yipster designer

    never done a crossing but know there are tabel books with tradewinds and tides, most people use the winds
     
  5. TeddyDiver
    Joined: Dec 2007
    Posts: 2,507
    Likes: 107, Points: 73, Legacy Rep: 1650
    Location: Finland/Norway

    TeddyDiver Gollywobbler

    There's nothing mental in this regard.. Carthaginians (or phoenicians whatever ancient traders) used uw "kite" in deep counter current to sail against the surface current by the Pillars of Hercules..
    But that was a bit different solution..
     
  6. daiquiri
    Joined: May 2004
    Posts: 5,361
    Likes: 232, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    That's why I love this forum. :D
    I'd like to learn more about it, do you have some link with more info to share?
     
  7. TeddyDiver
    Joined: Dec 2007
    Posts: 2,507
    Likes: 107, Points: 73, Legacy Rep: 1650
    Location: Finland/Norway

    TeddyDiver Gollywobbler

    I read that one ages (=decades) ago.. don't remember the source anymore.. sorry!
     
  8. shugabear
    Joined: Jul 2009
    Posts: 20
    Likes: 2, Points: 0, Legacy Rep: 17
    Location: alabama

    shugabear jr member

    i found this today thouhgt you may want a look at ithttp://www.patentstorm.us/patents/6694910/claims.html check it out dont think you are the only one who has thought about it maybe it will help
     
  9. apex1

    apex1 Guest

    But maybe the only one at the age of 13?
     
  10. shugabear
    Joined: Jul 2009
    Posts: 20
    Likes: 2, Points: 0, Legacy Rep: 17
    Location: alabama

    shugabear jr member

    thats great you have such tanasity so young i wasnt implying harm but help
     
  11. mgriffin

    mgriffin Previous Member

    You could also use sails if the current is unfavorable.
     
  12. SamSam
    Joined: Feb 2005
    Posts: 3,429
    Likes: 106, Points: 63, Legacy Rep: 971
    Location: Coastal Georgia

    SamSam Senior Member

    Underwater sails... There is also a recent patent for one that is adjustable for depths. Apparently surface currents can go one way and not too far down they can be going 180 degrees opposite.
     

    Attached Files:


  13. thudpucker
    Joined: Jul 2007
    Posts: 885
    Likes: 31, Points: 0, Legacy Rep: 453
    Location: Al.

    thudpucker Senior Member

    During the Salmon Season, Fish n Game might call it 'drift net fishing'

    I used a big home made sea anchor in the straights of Juan De Fuca on my 22' Cedar boat.
    I'd run out the straights, drop that Anchor and let the current take my back to Sequi about the same speed as the Salmon run. It worked very well, but dealing with that Sea Anchor was a pain.

    From that experience, I dont think a Bigger Sea Sail would do any more for you than a much smaller Sea Anchor.
     
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.