Hello all,
While we were moving our boat to the yard to get it repaired (see my previous 
post about a jetski hitting us), we motored about 12 miles.  For reasons I can 
get into later, we were going only about 4 knots.  We were in the Gulf of 
Mexico and the going up Tampa Bay in light conditions with relatively minimal 
seas.  About every 30 or 45 seconds, without any particular connection to 
waves, we got a quiet but discernible "thump" or "thunk" that I could feel 
through my feet.  It seemed to be most noticeable when I propped my foot on the 
starboard stern locker.  That is the propane locker.  I looked in there, and 
did not see the tank rocking or other reason for the noise.  

It did not seem to be linked to waves, as we hit multiple rocking boat wakes 
and other wave forms, so I saw no consistency there.  Nor did I see any link to 
revving the engine, shifting in & out of gear, etc.  

There was no indication of a crab pot bouy or anything else, either, but I 
haven't been under the boat.  

Any idea what might be causing the noise?
Would a failing motor mount cause this, and how would I diagnose it?
Thanks for your insights,

Bruce Whitmore
1994 C&C 37/40+ "Astralis"Madeira Beach, FL  
(847) 404-5092 (mobile)
[email protected]
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