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Depends on how deep the opening for the through hull is.
The formula for flooding is:
Q = 20 x d x square-root of h
Q = flooding rate in gpm
d = diameter of hole in inches
h = depth of hole underwater in feet
So, if your through-hull is 3' below the LWL, then you've got Q=20 x d (1) x h (sqrt 3) or 20 x 1 x 1.735 = 34.7 gpm.
A Rule 1500 pump supposedly does 1500 GPH, or 25 GPM. However, if the bilge pump hose has any head (vertical rise) that number drops significantly...so figure that a Rule 1500 would actually pump 15 GPM or so... You'd need a much bigger pump to keep your boat afloat.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Last edited by sailingdog; 05-23-2008 at 01:55 PM.