what's this sail used for ?

Discussion in 'Fiberglass and Composite Boat Building' started by hyboats, Oct 25, 2012.

  1. hyboats
    Joined: Jun 2010
    Posts: 78
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Sydney

    hyboats Junior Member

    look at the photo, it is a25ft fishing boat.
     

    Attached Files:

  2. Frosty

    Frosty Previous Member

    Obviously its so that you can find your boat in a busy storage park. It a good idea --every body should have one.

    Its the hoola hoop thats confusing me.
     
  3. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    Suspect its some kinda utility sail to improve visibility as Frosty states or it promotes drift for fishing ? Perhaps it steadies the boat in a seaway while fishing ? The mast and rigging look poorly engineered so you couldnt expect much from the sail plan.
     
  4. baeckmo
    Joined: Jun 2009
    Posts: 1,173
    Likes: 137, Points: 63, Legacy Rep: 1165
    Location: Sweden

    baeckmo Hydrodynamics

    Apart from the obvious function according to Frosty, those sails are mainly used as roll damping devices. In addition to that, the center of lateral area above WL comes closer to the center of the "wet" lateral area. Thus the boat is better balanced when drifting.
     
  5. Frosty

    Frosty Previous Member

    Im pretty sure this thread will burst out into catamaran talk any minute now. Perhaps discussing the effect of a multi hull not needing such a complicated contraption.
     
  6. daiquiri
    Joined: May 2004
    Posts: 5,372
    Likes: 247, Points: 73, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    :D:D:D:D
     
  7. gonzo
    Joined: Aug 2002
    Posts: 14,507
    Likes: 659, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It looks like a steadying sail. The use is for keeping the boat from rolling.
    Frosty: stop hijacking threads with your drivel.
     
  8. sottorf
    Joined: Sep 2007
    Posts: 192
    Likes: 20, Points: 0, Legacy Rep: 202
    Location: South Africa

    sottorf member

    It is a small sail that is used to point the bows into the wind when the boat is stationary while fishing, primarily with nets.

    Nearly all the small fishing boats in Norway have them...
    see http://www.oceanwideimages.com/images/17221/large/fishing-boats-norway-50M0370-02.jpg for example.

    Maybe there is a Norweigan fisherman on this forum who can explain exactly how this works?

    I agree with Gonzo- keep comments objective.
     
  9. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    Sure, East Coast lobster boats have been using riding sails for generations to steer down pot lines..

    The contraption fitted to that twin outboard rig pictured may be a riding sail. Looks pretty wanky.


    Riding sail in use........"""He tells me that he keeps the sail up pretty much all the time. When steaming along, it balances the “sail area” of the cabin forward and, at the cost of a bit of increased leeway, it allows him to run a straighter course without a large amount of rudder correction. Sometimes he adjusts the set of his riding sail to suit the wind direction. When bait fishing (mackerel or herring) or market fishing (haddock, mackerel, cod (used to be)) he hauls – by hand – his nets up over the starboard side, picks the net, and lets it slide over the port side. The combination of the cabin and sail allow the boat to drift beam-to downwind over his nets, allowing him to concentrate on his nets without having to jockey the boat as well. When he is lobstering, he steams upwind to beyond his pot buoys, swings to port (his helm is on the port side), and drifts down on them. As he hauls the pots, opens, re-baits, and drops them overboard again, he incrementally moves each one down-wind a bit. When he hauls the last one in each group, he steams back upwind and places it in the position where the first one was. He occasionally gives a pull on one or the other of the riding sails sheets to “steer” the boat across the wind while drifting down on his traps. When he gets home, he leaves the riding sail set on centreline so that the boat rides well at its mooring without the wind pressure on the cabin structure causing the boat to veer from side to side of the mooring."""
     

    Attached Files:

  10. tunnels

    tunnels Previous Member

    Took a while and during the move they were uncovered . you were building a mould . These are the cradles we use a 1 ton chain block its hooked to the top and to the slide with the tube and raises and lowers where ever you want . just 2 stands can be used for all your moulds !
     

    Attached Files:

  11. Frosty

    Frosty Previous Member

    -Its called humour Gonzo,---- we all know what its for.

    Well done on the 3 sentences by the way
     
  12. kvsgkvng
    Joined: Jan 2012
    Posts: 212
    Likes: 8, Points: 18, Legacy Rep: 49
    Location: *

    kvsgkvng Senior Member

    This small sail also points the bow perpendicular to the oncoming waves when not under sail and trying just to out-wait the storm.
     
  13. michael pierzga
    Joined: Dec 2008
    Posts: 4,862
    Likes: 115, Points: 0, Legacy Rep: 1180
    Location: spain

    michael pierzga Senior Member

    But again...what is the contraption on that boat .

    How do you sheet it, brail it ?
     
  14. tunnels

    tunnels Previous Member

    Yeah your right !! they could be all colours of the rainbow so as not to get to confused !! if if they were the same colour cold have numbers on them or even funny faces !!:eek:
     

  15. upchurchmr
    Joined: Feb 2011
    Posts: 3,057
    Likes: 154, Points: 63, Legacy Rep: 579
    Location: Ft. Worth, Tx, USA

    upchurchmr Senior Member

    I kind of liked Frosty's attempt at humor. Worked for me - today. Maybe not always. WTF
     
Loading...
Similar Threads
  1. hyboats
    Replies:
    8
    Views:
    1,309
  2. hyboats
    Replies:
    14
    Views:
    2,479
  3. hyboats
    Replies:
    5
    Views:
    3,833
  4. apson
    Replies:
    15
    Views:
    7,389
  5. robali
    Replies:
    30
    Views:
    5,390
  6. glasscrafters
    Replies:
    10
    Views:
    1,694
  7. mongo75
    Replies:
    22
    Views:
    4,426
  8. mongo75
    Replies:
    6
    Views:
    2,320
  9. Ronjon
    Replies:
    44
    Views:
    786
  10. pironiero
    Replies:
    6
    Views:
    359
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.