Ketch ketch and the yawl have two masts, with the main mast foremost; the distinction usually being that a ketch has the mizzen mast forward of the rudder post, whereas on a yawl, it is aft of the rudder post. But the balance of sail area can be an overriding characteristic. If 20% or more of the sail area is in the mizzen sail the rig would be termed a ketch. This is particularly true on center cockpit yachts. Compared to a ketch, a similar size yawl's mizzen sail is much smaller than the main, because of the limitations of the
Norda steel keel is added under the wooden keel, to provide more counterweight in order to add higher masts and more sail. Its sail plan is wishbone ketch. Norda Norda is a wooden sailing vessel that was commissioned in 1928, originally used as a research vessel in Poland. It served as research vessel, fishing vessel and is now a yacht. The vessel was commissioned in 1928 by MIR (Polish Fishing Institute). It was built in 1928 to order of in the Andersen Shipyard in Frederikssunde, Denmark. It was christened "Ewa", inspired by the names of daughters of both Professor Michał Siedlecki