Harken Dinghy Vang System The Dinghy Vang comes pre-reeved with low-stretch polyester line. It is constructed with a 3:1 cascade inside a 5:1 purchase for a powerful 15:1 system. 16 mm blocks handle high loads. A Micro Carbo-Cam® allows precise trimming; pivots for a fair lead, so it’s easy to cleat, and angles up and down to accommodate mounting height. The Dinghy Vang has a maximum mast to boom distance of 30 in (760 mm). A simple line adjustment shortens the system.