Keel modification

Discussion in 'Downeast Projects and Boat Building' started by Henfruit, Nov 13, 2017.

  1. Henfruit

    Henfruit Senior Member

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    Location:
    SC winter Deer Isle Summer
    Boat Make:
    Samson 30
    trying to get more water to the prop. My dead wood is one big water bypass to the prop. The yard and some local lobsterman saw the boat and suggested this idea as they have done it before. We will see how it helps. More water to the prop should help with hull vibration and maybe gain a little more efficiency and speed. Hope to get it done this week and sea trial. One hold back. It is Deer season in Maine
     

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  2. Brooksie

    Brooksie Captain

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    I made mine of oak and bolted them on. I think they should be in the center too. I think you will like the change
     

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  3. RockBottomFish

    RockBottomFish Senior Member

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    Location:
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    BHM
    Interesting....
    Any thoughts on doing the same on a 31 BHM. Have no vibration issues, what else would be gained?
    Brooksie, what change did you experience?
     
  4. ArchHibb

    ArchHibb Senior Member

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    Subscribed...
     
  5. Brooksie

    Brooksie Captain

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    I did it so long ago I can't remember exactly how much speed I picked up, but some. Also backing down improved. I had some vibration and had just gone from 3 to 4 blades and thought I had it cured but these "fairing blocks" helped as much as the 4 blade over the three.
     
  6. Keelboater

    Keelboater Captain

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    I found these under a ton of old bottom paint on my boat. I always thought the keel was shaped that way until the paint was stripped.

    Blast Surprise.JPG
     
  7. Field Tester

    Field Tester Senior Member

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    I modified mine when I re powered. I went from running a 22" wheel to a 26" along with a ratio change. Boat runs great! Very smooth, no more vibration in the floor above the prop.
     

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  8. Field Tester

    Field Tester Senior Member

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    A couple more pics.
     

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  9. Toolate

    Toolate Captain

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    1998 36' Sabre Express CAT 3116TA's, 2015 ROS Scotia 16 Etec 50
    Where is GMAC? His thread was ridiculous (ly good)...
     
  10. traditions

    traditions Captain

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    Location:
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    A previous owner dished out ahead of the stern post on my Novi. They did a nice job, instead of adding fairing blocks, they cut out ahead of the stern post, and filled it in like on field testers boat. the stern post on a Novi must be 8 inches wide. I know of another Novi that had a bad vibration, and fairing blocks took care of the problem.
     
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