Frank S. Comments Favorites Listings 50′ Nielsen Yawl (1954) – TIOGA Tioga is a K. Aage Nielsen, 50’ CCA Yawl, originally 49′ Cold-Molded Schooner (1984) – SIR ISAAC Sir Isaac is a cold-molded schooner designed and built for Schattauer Sails Schattauer Sails has been serving sailors in the Pacific Northwest