"pocket" transoms

Discussion in 'Powerboats' started by RTN, Apr 10, 2005.

  1. Reese
    Joined: Jun 2003
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: California

    Reese Junior Member

    Sorry to jump in....what you guys are talking about is called a "notched transom". As previously mentioned, it does help to get a cleaner stream of water to the prop helping efficiency, but the real purpose is to increase the fulcrum effect at top speed without sacraficing hole shot.

    For example a 20 ft. bass boat with a notched transom of 10" along with a setback plate of 10" will have a total setback of 20". Upon take off, the notched section is under water and the boat behaves as if it only had 10" of setback. Once the boat plans the flat keel begins to raise the boat and the CG begins to move towards the transom near the notched section.

    At speed, this setup will require less trim from the outboard allowing greater power to be directed towards forward motion. This also explains why 280 hp outboard bass boats routinely hit 100 mph.
     
  2. texas nitro
    Joined: May 2005
    Posts: 13
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: houston

    texas nitro Junior Member

    can anyone help? :confused:
    pocket tunnel taking on water between transome and engine bracket and will not plane properly
     

  3. Corpus Skipper
    Joined: Oct 2003
    Posts: 606
    Likes: 8, Points: 0, Legacy Rep: 173
    Location: Corpus Christi TX

    Corpus Skipper Hopeless Boataholic

    ???? Set back bracket, jack plate????? If either of these are the case, a tunnel extension will solve that problem. As far as planing, I think you were in another thread with that one http://boatdesign.net/forums/showthread.php?t=7664
     
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