Displacement hull performance

Discussion in 'Powerboats' started by MarcGG, Jun 29, 2018.

  1. MarcGG
    Joined: Jun 2018
    Posts: 2
    Likes: 0, Points: 1
    Location: Sydney

    MarcGG New Member

    Hi there!
    Is there a practical way to increase the performance of a displacement hull?
    Boat is a little 25' cruiser
    https://www.australianboatmags.com.au/pdf/previews/BTSEAR11_prev.pdf

    I remember (a long time ago) seeing a cruiser that had added a pair of skies, one each side of the hull to lift it out of the water and turn it into some sort of semi displacement. Is this possible on a boat with this shape or not?

    Your replies are appreciated. :)
     
    Last edited: Jun 29, 2018
  2. DCockey
    Joined: Oct 2009
    Posts: 3,993
    Likes: 151, Points: 63, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    Hi there!
    Is there a practical way to increase performance of a displacement hull?
    Boat is a little 25' cruiser
    https://www.australianboatmags.com.au/pdf/previews/BTSEAR11_prev.pdf

    A large and heavy 25' cruiser. 3.25 tonnes advertised displacement (boats generally are heavier than advertised). 25' length and 10' beam.

    My slightly knowledgeable thought is the concept of a boat on water skis requires a very light boat.

    Installing a more powerful engine with a suitable prop may increase top speed, but probably with significantly increased fuel consumption. Add enough power and undesired characteristics of one sort or another are very likely to result.
     
  3. ben2go
    Joined: Jul 2008
    Posts: 161
    Likes: 4, Points: 18, Legacy Rep: 13
    Location: Upstate, South Carolina,USA

    ben2go Boat Builder Wanna Be

    If you consider performance an increase in speed, no. The hull speed is set by the design. If the boat is pushed past the design limits, she will squat and wallow, while raising her bow and burning more fuel.
     
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