I know this ? has been addressed many times, but I still don't get it! The more research on this on these forums(which are GREAT!) It's got me thinking this may be the cause of change in performance. I've posted before W/ RPM/WOT ?'s (thanks to all who responded!) But the motor ( '88 OMC 3.0) seems to check out fine. I'm new to power boating last year was my 1st season, 2nd time out..."forgot the PLUG!" boat took on "alot" of water, dealt w/ all the imediate stuff(new starter, etc...) I don't have much recall on how the boat ran "pre-swamping" but, it seems harder to get on plane, and RPM @WOT +-3K. So, the long way to the ?, How can I tell if water is trapped in the hull and could this be the problem??? Please Help! Thank's in advance!