Rick, I believe that 4" square hole is the bilge inside the keel. If you stick a mirror on a stick and look around you should see that it is actually a 2 ft long tapered shape. This is where the bilge pump would go if you had one. The only reason I could possible see for filling it up would be to prevent loose items like knives, flashlights, or whatever from rolling down there. I have heard of some M15 owners who have added a few lead sash weights their to add keel weight. Thanks Doug --- chbenneck@juno.com wrote:
Hi Rick,
When I cut out the starboard shallow sail locker to gain more storage space, in my M15, I found Styrofoam logs, 12" x 12" x about 30", in the same area.
There also were similar ones up in the bow compartment.
I assume that Jerry added those when the M15s were built to make them unsinkable.
Connie
_______________________________________________
http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
__________________________________ Yahoo! Mail for Mobile Take Yahoo! Mail with you! Check email on your mobile phone. http://mobile.yahoo.com/learn/mail