Zawisza Czarny (ship) Association, ZHP and its home harbor is Gdynia. The rig is one of a very rare kind. The three masts are rigged as a wishbone ketch. Only a few sailing vessels are using it today and it is mainly seen on smaller units. Zawisza Czarny (ship) Zawisza Czarny is the name of two Polish sailing-ships owned by the Polish Scouting and Guiding Association, ZHP. Zawsisza Czarny used to be a fishing vessel. After that use it was rebuilt to become a sailing vessel. Three masts were fitted on it and the motor that was built in was an old motor
Radio masts and towers sometimes also constructed out of steel tubes. This construction type has the advantage that cables and other components can be protected from weather inside the tube and consequently the structure may look cleaner. These masts are mainly used for FM-/TV-broadcasting, but sometimes also as mast radiator. The big mast of Mühlacker transmitting station is a good example of this. A disadvantage of this mast type is that it is much more affected by winds than masts with open bodies. Several tubular guyed masts have collapsed. In the UK, the Emley Moor and Waltham TV stations masts collapsed in the 1960s.