Problems with Stayin on plane

Discussion in 'Powerboats' started by Matt6114, Mar 2, 2008.

  1. Matt6114
    Joined: Mar 2008
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Virgin Islands

    Matt6114 New Member

    I have a 1986 Silverton 340 Convertable and have trouble staying up on a plane once i get there when going with the seas. I will get up to 16 knots at 2800 rpm then it feels like the boat sinks back into the water and reduces my speed by 5 knots. Could this be a trim tab problem or something else??
     
  2. Jango
    Joined: Aug 2005
    Posts: 519
    Likes: 7, Points: 0, Legacy Rep: 63
    Location: Mid Atlantic

    Jango Senior Enthusiast

    I could be completely wrong, but, it sounds to me like the following seas are "Helping" the Boat up on plane, but due to inadequate power, boat cannot sustain planing speeds.
     
  3. Gannet
    Joined: Oct 2006
    Posts: 37
    Likes: 1, Points: 8, Legacy Rep: 36
    Location: Baltimore, MD

    Gannet Junior Member

    When you get up on plane is it safe to assume that your prop is not breaking the surface?
     
  4. Ike
    Joined: Apr 2006
    Posts: 2,235
    Likes: 179, Points: 63, Legacy Rep: 1669
    Location: Washington

    Ike Senior Member

    How big are the "seas"? Are you on the face of the wave, or the back of the waves? If on the face of the wave you get a boost, if on the back of the wave it tends to slow you down. If traveling a little facer than the wave, you plane down the face and into the back of the next wave which then slows you down. Kind of a yo-yo effect.
     

  5. charmc
    Joined: Jan 2007
    Posts: 2,391
    Likes: 78, Points: 0, Legacy Rep: 840
    Location: FL, USA

    charmc Senior Member

    Peter is asking the right questions, and we need a more detailed description. Describe the seas, where the boat is in relation to the front or back face of the swells, how does the boat perform at 2800 rpm in sheltered waters, what is your trim tab setting for the situation you are describing? Has the boat been repowered since new? what engines do you have, etc. Can't have too much info.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.