Bigger - yachta yachta...
A vessel is too big when it streatches across two large waves. Many freighters do, and it is they're downfall; bow on 1st wave, stern on following wave, they work against one another and can break the back of a ship.For yachts, bigger is 'mostly' safer as there is more bouyancy, and the waves are then "smaller" in proportion to the hull length, the hull must be quite strong and well designed, but refer to A above for TOO BIG.Other factors do come into play, more systems, more through-hull fittings, harder to find damage - leakes et al.A yacht is a yacht when it is used strictly for pleasure.If you can afford to have others clean out the galley, head and cabin sole fine, but if you accept one thin dime for a charter or for fuel even it is no longer a yacht. Here, in the US we do not distinguish between sail or P/V but down under they do. A power vessel is NOT a yacht, that distinction is soley for sailing vessels. Technically a Hobie cat is a yacht if used for pleasure only and not hired out or in, but not normally referred to as such. There is no length or 'live-aboard' status for a 'yacht' sorry tony...;-( Your views on a ketch compared to a sloop are sound in my humble opinion, and I tend to agree that the 'free boat' may be some wierd attention getting scam, but how does one know? Gots tuh be more edjamakated dan I!Good on ya mates, and Happy Holidays to all!