This just in from Nellie D. 37VT63

We [John and Dave Howell] just got beaten up for 40 miles heading into Norfolk--24kts on the nose with tight steep waves.  In the calm of the harbor now.  Our fuel tanks were low enough, and it was rough enough, that the back two tanks started shipping air.   Shutting the tanks's valves off took care of the engine revving problem.  (Picture from the APRS HAM tracking system aboard Nellie D.)