Bilge keels on a Gartside double ender

Discussion in 'Boat Design' started by Trout, Sep 2, 2018.

  1. Trout
    Joined: Sep 2018
    Posts: 12
    Likes: 0, Points: 1
    Location: Blue Hill, Maine

    Trout Junior Member

    I haven't been able to find data using end plates on low aspect foils, but a lot of positive reports, if mostly anecdotal, using end plates on various keels and rudders.

    The plan is for the keels to be of welded steel so they won't be very sacrificial. If made of heavier gauge it would help lower CG.
     
  2. DCockey
    Joined: Oct 2009
    Posts: 4,244
    Likes: 184, Points: 63, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    If the section shown is used and the "toe-in" angle is described based on the flat side labeled "inboard", then 1 degree of nominal toe-in will be a hydrodynamic toe-in (relative to the zero side force angle) of around -1/2 degree, ie around 1/2 degree of toe-out.
     

  3. Trout
    Joined: Sep 2018
    Posts: 12
    Likes: 0, Points: 1
    Location: Blue Hill, Maine

    Trout Junior Member

    David, I used the chord of the foil for the 1 degree. Not sure how critical it is as most of recommendations I found said to toe in "a little" with a few saying 1 to 1 1/2 degrees. Is there an optimum? And how could it be calculated for a one off hull? It will be important to record whatever it is as I may have to reposition if the initial positioning seems off.
    See you tomorrow in Castine.
    Thanks, Steve
     
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