· Old as Dirt!
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The added weight, which is pretty minimal considering your yacht (HR35) will have little adverse effect and may tend to make the boat marginally more stable in a seaway, rather than less, due to the increase in the roll moment of inertia of the rig. In the "olden days", once ships discharged their deck cargos, which lowered the center of gravity of the ship and made their rolls "snappy", ship masters would have sacks of coal hoisted into the rigging to slow a ship's roll in a seaway. Whether they realized the physics or not, what they were actually doing was incresing the ship's moment of inertia (the flywheel effect).