bow ballast tank pickup question

Discussion in 'Powerboats' started by gtflash, Oct 9, 2011.

  1. gtflash
    Joined: Jun 2006
    Posts: 128
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    Location: uk

    gtflash Senior Member

    I have a bow tank, that fills with water on a high speed planning hull. It has 1 3/4" dia pickup, and I am trying to guestimate the amount of pressure on the tank, for eg at 70mph and when filling.

    I need to fit an inspection hatch into the tank and want something capable of holding up under the forces
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Well, ram pressure is 1/2*rho*v^2 so 73 psi give or take. That compartment better have some serious structure or be vented. If it is vented, max pressure is going to be geometry dependent.
     
  3. gtflash
    Joined: Jun 2006
    Posts: 128
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: uk

    gtflash Senior Member

    3" vent..........
     
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