![]() ![]() With large righting moment for a much smaller angle of heel, these ships return to a stable position within a fraction of seconds when forcibly heeled to one side. 1 ) Stiff ShipĪ ship or vessel is said to be stiff when its metacentric height is much larger thus making the ship highly stable. Tender ship and stiff ship help us know of the two extremes of ship stability while the actual ship lies somewhere in between. Then there are other factors such as the distance of C.G from its keel, inclination, weight distribution, righting moment, and angle of heel that decides if the ship is tender or stiff.įrom the point of designing the ship deciding on a suitable metacentric height of a vessel is an important factor in setting the comfort and stability level of a vessel. This metacentric height is what defines whether its a stiff or a tender ship. What Is Stiff And Tender Ship?įor a floating vessel, the distance between its center of gravity G and its metacenter M is known as the metacentric height. In such a case the ship will auto stabilize rolling back to its initial condition when acted upon by the external forces. It is on these stability forces and the nature of stabilization a ship is said to be a stable, unstable, tender ship, or stiff ship.Ī ship is said to be stable if the C.G lies below the center of buoyancy. This can be seen in the form of metacenter the point at which the upward buoyancy force axis cross that of the center of gravity. ![]() The ship is acted upon by a righting moment that tends to stabilize the ship. In the event when the center of gravity and center of buoyancy does not lie in the same line. Under this condition the downward gravity and upward buoyant force are in equilibrium. In most cases this axis of flotation passes through the center of gravity and center of buoyancy cutting through a straight line. A ship or boat floats in water when its downward acting weight is balanced by the upward buoyancy. The term stiff and tender ship is a key part of the vast topic i.e ships stability. ![]()
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