need to find info

Discussion in 'Boat Design' started by Jeff Walkowiak, Feb 12, 2005.

  1. Jeff Walkowiak
    Joined: Sep 2004
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: west central fla

    Jeff Walkowiak cobra jet steering

    I am trying to find info to calculate the water resistance at 50 mph on a flat surface of 40 sq in ,in either inch or foot pounds, don't seem to be having any luck, thanks J T Walkowiak,, jeff@cobrajetsteering.com
     
    Jeff Walkowiak, Feb 12, 2005
    #1
  2. jehardiman
    Joined: Aug 2004
    Posts: 3,776
    Likes: 1,171, Points: 113, Legacy Rep: 2040
    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Use the ITTC line.

    Cf=0.075/(logRn-2)^2

    Unless what you have is a flat plate buried in the skin plating, you would still need the shape factor and pressure drag. Get a copy of Hoerner, Fluid Dynamic Drag, and read it.
     
    jehardiman, Feb 12, 2005
    #2
  3. Jeff Walkowiak
    Joined: Sep 2004
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: west central fla

    Jeff Walkowiak cobra jet steering

    help

    actually a flat plate moving at 50 mph in static water. thanks
     
    Jeff Walkowiak, Feb 12, 2005
    #3
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