Strange appendage

Discussion in 'Boat Design' started by Velsia, Dec 12, 2011.

  1. Velsia
    Joined: Oct 2008
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    Velsia Floater

    Does anybody have any ideas what this is? It measures about 20mm. I found it on a very early Dubois 1/4 tonner.
     

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  2. Olav
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    Olav naval architect

    I guess it's just a kind of "knife" to prevent weed from getting caught in the gap between the skeg and the rudder blade.
     
  3. Velsia
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    Velsia Floater

    Good call olav
     
  4. Submarine Tom

    Submarine Tom Previous Member

    I'd agree.

    -Tom
     
  5. michael pierzga
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    michael pierzga Senior Member

    Ya..weed , rope deflector to keep junk out of the skeg ,rudder interface.
     
  6. thedutchtouch
    Joined: Feb 2010
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    thedutchtouch Junior Member

    looks like your boat needs a male name.
     
  7. JosephT
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    JosephT Senior Member

    Reminds me of an understern rudder a chap out in LA, California installed on his surfski. Rather than use the composite rudder provided by the manufacturer, he welded up a huge butcher's knife to help him cut through the kelp & sea weed.

    Lord help the poor soul in the surf who collides with it. It would surely cause a severe laceration.:rolleyes:
     
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  8. viking north
    Joined: Dec 2010
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    viking north VINLAND

    Definately some sort of deflector or cutter set up. puzzling if a deflector why so far away from that rudder to hull gap where ropes jam into. Did you take a closer look at it, is there a grouve that one would fit a cutting blade into or is there the corroded remains of a metal cuttin blade?
     
  9. hoytedow
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    hoytedow Carbon Based Life Form

    It looks like an uncorroded blade in its own right of stainless steel. That white bit at the bottom looks like dew.
     

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  10. viking north
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    viking north VINLAND

    Ahhhh -- most likely a cutter-- however if it works as a deflector without cutting it would make alot of lobster fishermen happy :)
     
  11. hoytedow
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    hoytedow Carbon Based Life Form

    Photographic lack of definition (too blurry) precludes me being able to see if there is any bevel. It may be a dull edge.
     
  12. Dirteater
    Joined: Oct 2010
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    Dirteater Senior Member

    could it be for ice?
    (sorry if thats a dumb question)

    DE
     
  13. Olav
    Joined: Dec 2003
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    Olav naval architect

    Probably an attempt to keep the rudder out of the vortex trail from the deflector. Think of the boat sailing along with some leeway, where the vortex will pass the rudder on its windward side when mounted far enough forward of it (see attached sketch).

    Not really. ;) A 1/4 Tonner would hardly sail in winter with ice, and even if it did, this device wouldn't make any sense at that position (and it doesn't look strong enough also). There are rudder protection devices on ice-going vessels that look quite similar, but they are mounted behind the rudder, thus protecting it when going astern.
     

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  14. lewisboats
    Joined: Oct 2002
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    lewisboats Obsessed Member

    The thought "wee winkie" did come to mind when I read the title and looked at the picture :p
     

  15. Velsia
    Joined: Oct 2008
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    Velsia Floater

    The white bit is water, pictures were taken between winter showers. If its any help the boat was built around 78. Very IOR. Also hoytedow it does have a dull edge but that could be due to age
     

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