neen some factors for a calculation

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

  1. Jeff Walkowiak
    Joined: Sep 2004
    Posts: 17
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    Location: west central fla

    Jeff Walkowiak cobra jet steering

    would any one know what preasure water exerts per sq in or sq foot at 50 mph, thanks, trying to do a calculation on 40 sq in surface if it were opposing water completely flat against the flow at 50 mph.wondering what force there would be pushing against it. thanks in advance for any help. J T Walkowiak jeff@cobrajetsteering.com
     
    Jeff Walkowiak, Feb 12, 2005
    #1
  2. John David
    Joined: Jul 2004
    Posts: 29
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    Location: Long Island

    John David Junior Member

    This post has been arround a while, so I don't know if you got an answer yet or if you still want one. In any event,the dynamic pressure in water(pounds per square foot ) is very close to the square of the velocity in feet per second.So that 50 mph becomes 73.3 fps. The square of this number yields almost 5400 pounds per square foot.Flat plate drag coeficients are as high as 1.28, but in your case,due to cavitation would be somewhat lower.Even so your 40 sq.in., which is 0.278 sq. ft.would create a huge 1500 pounds of drag.
     
    John David, Apr 14, 2005
    #2
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