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Old 11-10-2015, 12:53 PM   #13
boatpoker
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Quote:
Originally Posted by Northern Spy View Post
If your thru hull is 4' underwater there will be about 2 psi differential pressure on a 1" hole will be about 29 gallons per minute. So say half a gallon per second.

So 10 seconds open time is only 5 gallons.

Ten seconds is a long time.
My Bernoulli chart shows a 2" hole 4' underwater will permit ingress of 157.1 gallons per minute or 26.18 gallons in 10 seconds.

To the OP ..... before you touch anything be sure you are dealing with matching thread types. Most throughulls are NPS and many ball valves are NPT. You don't want to pull a Beneteau
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