May leave the sidedecks free, don't have to pass under them to go forward.
Allow for tighter sheeting angles on the head sail, allowing the boat to point better.
Probably require more tension on the rig to support the mast properly.
If not properly installed and bedded—can lead to water intrusion into the deck or cabin—can lead to deck delamination/core rot or bulkhead rot and create an expensive repair.
Possible risk of crevice corrosion where the chainplate passes through the deck
Requires wider sheeting angles for genoa, reduces ability to point. May allow an in-board set of tracks for a jib fairlead, which would negate this problem for the most part.
Usually lower rig tension than if mounted inboard.
May obstruct passage forward, as you have to duck the shrouds when going forward.
If mounted to the outside of the hull, can be easily inspected and replaced.
Some risk of crevice corrosion if not bedded properly.
More vulnerable to damage in the case of a collision or allision.
Rigging is further outboard and more liable to be damaged.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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