Air Step

Discussion in 'Hydrodynamics and Aerodynamics' started by Velsia, Oct 8, 2011.

  1. Velsia
    Joined: Oct 2008
    Posts: 92
    Likes: 13, Points: 8, Legacy Rep: 15
    Location: Jersey C.I

    Velsia Floater

    I have seen a few Beneteau powerboats with this technology.

    I have to say I am dubious that it would live up to some of the claims http://www.beneteau.com/Motorboats/Air-Step-R.
    Especially
    "Exceptional seakeeping"
    and
    "Cutting through waves made easier"

    It might be my ignorance but I don't see how an increased laminar boundary at the rear end can facilitate this.

    Could anybody explain?

    Cheers
     
    1 person likes this.
  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    It's not revolutionary. Maybe they have done some minor improvement to a ventilated hull design. When a boat goes fast enough, it needs less bottom surface to stay on a plane. Some air can be introduced to reduce skin friction. Also, if there is less lift aft, the boat will ride more level.
     
  3. Velsia
    Joined: Oct 2008
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    Location: Jersey C.I

    Velsia Floater

    Good point Gonzo. I didn't think of that. any ideas about the seakeeping?
     
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    I've been on some that ride great, but some can be unpredictable.
     
  5. DCockey
    Joined: Oct 2009
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    Location: Midcoast Maine

    DCockey Senior Member

  6. Velsia
    Joined: Oct 2008
    Posts: 92
    Likes: 13, Points: 8, Legacy Rep: 15
    Location: Jersey C.I

    Velsia Floater

    Cheers David
     

  7. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    I would love to see a video taken by a camera placed BELOW the hull, where the ventilated steps are. I am very sure that they would discover that air behaves very differently from what their brochure and the BoatTest.com video claims.
    They have simply re-invented a stepped hull, with all the related benefits to the ride comfort (pitch stability) and hull drag. All those stories about air bubbles doing a magical work down there are just another marketing hype.

    We are currently witnessing a boom of marketing efforts by major boatbuilding companies, all based on some (claimed) revolutionary hull forms, but none of which has ever been fairly tried against more traditional solutions, based on equal hull and propulsion parameters.
     
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