Sail Skills - Stability Free guide to ship and small vessel stability. Aimed at small vessel users but suitable for professional mariners. Diagrams, text and animations explaining stability: from righting lever to movement of liquid in tanks – the free surface effect. Demonstrates adding weights to a vessel, heel and list. Especially recommended for RYA examination candidates. Righting moment and lever A small sailing vessel heeled by the wind Diagram: relating topweight in a sailing vessel to levers and moments Levers & moments Diagram: a vessel heeled showing righting lever (GZ) A vessel recovering from inversion Inverted Stability Heel & angle of heel Diagram: a vessel kept afloat by her buoyancy Buoyancy Diagram: centre ofbuoyancy (CB) of a vessel heeling Centre of buoyancy (CB) Diagram: a vessel at the angle of vanishing stability (AVS) Angle of vanishing stability (AVS) GZ Curve for a stiff and tender vessel - showing initial steepness of curves GZ Curves Centre of gravity (CG) Diagram: centre of gravity (CG) of a vessel heeling
Every penny helps … Stability Home>Stability Explained>Levers & Moments back to top See-saw - effect of length of lever As the moment depends on both the length of lever and the weight, the moment of the car could be increased by adding weight to the car - such as passengers: Increasing moment by adding weight A large scanner fitted well up a sailing vessel’s mast Sometimes compromises have to be made - a lighter scanner fitted lower! The maths of levers and moments is simple. It is not necessary to understand the maths to grasp the basic principles of stability, although an explanation is provided in the note See-saw - effect of length of lever Diagram: sailing vessel with a large scanner fitted well up her mast
Boating Books