twin keel and rudder design

Discussion in 'Boat Design' started by Soundamonium, Mar 25, 2017.

  1. Soundamonium
    Joined: Mar 2017
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Cairns

    Soundamonium New Member

    Hi. Looking for your knowledge for those with experience in Twin keel and twin rudder concepts . 8 m aluminium 1/4 tonner.
    Was looking to chop current keel off and add twin keels . Images attached . I can weld and fabricate anything so this is not an issue .
    Aim is to improve stability, reduce draft, still maintain pointy into wind and lose no hull speed.
    Beam is 2.4m, Current keel is 1.2m. Lead weighted at bottom. Current total yacht weight is 800kgs.

    IMG_3284.jpg

    IMG_3307.JPG
     
    Soundamonium, Mar 25, 2017
    #1
  2. yades
    Joined: Aug 2006
    Posts: 95
    Likes: 13, Points: 8, Legacy Rep: 166
    Location: italy

    yades Senior Member

    Increase in frictional drag with double fin keel

    Increasing submerged area equals increasing in frictional drag thus ending in reduced hull speed
     
    yades, Mar 26, 2017
    #2
  3. yades
    Joined: Aug 2006
    Posts: 95
    Likes: 13, Points: 8, Legacy Rep: 166
    Location: italy

    yades Senior Member

    If You want to increase stability You must lower your CG
     
    yades, Mar 26, 2017
    #3

  5. yades
    Joined: Aug 2006
    Posts: 95
    Likes: 13, Points: 8, Legacy Rep: 166
    Location: italy

    yades Senior Member

    Furthermore, you should have more efficient appendages design to allow the boat pointing upwind further
     
    yades, Mar 26, 2017
    #4
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