20170220

If we follow the rule of thumb of 10% mast bury for unstayed masts, the mast bury for Hatseflats with LAD~450 should be 40cm. I could not find a logical explanation why it should be 10%.

The Topper (over 50000 sold) has 26cm mast bury with LAD=500 and 51mm diameter. TooPhat has 30cm with the same Topper rig. Laser has LAD~500, 7.6m2, and a mast bury of about 30cm The Goat Island Skiff (over 1000 plans sold) has LAD=440 and 30cm mast bury for a box mast of app. 70x70mm. The Skerry also has very little mast bury, about 27cm for LAD=339

I prefer to integrate the mast partner with the bow tank, which is 34cm above the cockpit sole. It is a requirement that the mast can be unstepped on the water. With 14kgs it is impractical to put the mast into a hole in the deck like on the Goat Island Skiff. Instead I am looking at Iain Oughtreds solution of hardwood chocks extending from the bow tank. (CPBM 6-133). This solution allows the mast to be walked into position and then locked into place.