[QUOTE=bgreene;185605]Does anyone know why there's a relatively small but isolated/ trapped hollow under the " floor" inside the transom battery and oil tank compartments ?
I mean below the floor that the battery and oil tank sit on - port and starboard rear of a V21.
This hollow doesn't empty into the bilge, and doesn't empty into the hull below the bilge........where the bottom screw out plug to the hull is either.
If it is as I believe - basically a " boxed in hollow" maybe Wellcraft did it to limit flooding if the floor drains did start to leak.
Youre right it's a air pocket to help with floatation, Some boat builders did this to help with floatation without weight from foam.
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1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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