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INSTALLATION AND USE MANUAL QUICK MC² X3_DC REV001A
Premise
STABILIZATION PRINCIPLES
The stability of a boat is inuenced by several factors, such as the hull shape, the displacement, the mass distribution, the
gyro installation position and sea conditions.
What is rolling?
Rolling is the oscillationof the boat around its longitudinal axis. Since vessels are much longer than larger, as a consequence-
side oscillation scan be felt much more.
The rolling motion is the most dangerous since it affects the vessel stability and it’s there for ethe one on which the rst
reduction studies have been carried out. More overside rolling is the main cause of sea sickness, especially in case of long
waves.
THE CORE OF BOAT’S STABILITY CONCEPT
In order to stabilize a boat, its center of gravity must be under the meta centre. In fact, the higher is its metacentrich eight,
the more stable is the boat.
THE CENTRE OF THRUST
BEFORE TALKING ABOUT STABILITY, WE NEED TO UNDERSTAND HOW THE THRUST’S CENTRE MOVES, ESPECIALLY DURING THE
ROLLING MOTION.
At equilibrium, the weight of the boat applies on (G), the Archimedes thrust applies on (C).
Throughout the rolling motion, the hull turns and the centre of thrust (C) constantly moves. Crossing the buoyancy force’s
line of action with the longitudinal plane of symmetry, we can find a new point called metacentre (M), located above the cen-
tre of gravity.
The distance between centre of gravity (G) and the metacentre (M) is called metacentric height (GM) which is very important
for a boat’s stability, since it represents the righting lever.
HOW A QUICK GYRO STABILIZER IS MADE
Quick MC2 gyro stabilizer has been designed for all typesof boats, with the goal of improving on board comfort level by redu-
cing the roll amplitude in presence of waves.
Gyroscopic stabilization takes place when a y wheel, rotating around its rotation axis, due to external causes (boat rolling)
also rotates around it sprecession axis, perpendicular to the rst, thus generating a stabilizing torque (gyroscopic effect).
The gyrostabilizer the refore opposes to the rolling movement by applying a stabilizing torque which opposes to the heeling
torque originated from the waves.
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