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Foam-filled mast
OK, with my28' S2 with 48' mast, the max righting torque I calculate is
about 4500 ft-lbs. For comparison, the torque produced by the 3300 lb keel is about 9900 ft-lbs. Now, for using expanding foam to silence internal halyard slap: With mast down drill holes at 3' intervals, make the holes about 1/4" to avoid stress cracking around smaller holes. Inject enough expanding foam. While it sets over a few hours, work the halyards back and forth. With mast UP. go up[ bosuns chair, drill 1/4" holes. Put a small balloon through the holes and inflate. Push the nozzle of the expanding foam in beside the balloon and above it. Inject foam. The balloon is there to keep the foam from just dropping down to the bottom. There are various versions of expanding foam, some exerts a lot of force/area and can push things out of alignment (not an issue here) and a less strong version intended for insulating around windows that would also work in this app. |
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