Sure the lines and fenders are a little bigger and there is more boat to rinse but otherwise they both have the same number of system except for a second genset on the bigger boat and a few more air handlers.
Biggest yacht single handed. However most yachts need crew for docking launching caring for guests and watching for danger or other boats. This event is raced in stages with between two and four intermediate stops going eastabout by way of the great. It was previously called Phocea and managed to cross the Atlantic in 1976 after which it was converted to a cruise ship by the French shipyard DCAN.
On the other hand I know I would be hard put to it to handle my friends 18M cat so I guess the largest I would consider at my age and state of decrepitude would be about 16M and only then if the boat was well laid out for single handing. Accommodation and still sail fairly well. Was to limit a 9-11 oz.
The two biggest boats I have single handed were a Hunter 40 Legend and a Cal 39 bit older than the Hunter. Oldest Single handed Circumnavigator. A crew can help because someone must always.
Set to be the British builders biggest yet the Spirit 111 comes nearly 90. The boat shouldnt be over 9 tons as things can get a little tricky and out of hand if the boat exceeds this weight. 50 feet and up.
With the appropriate boat licenses you can typically operate a boat up to 75 feet without a crew. The biggest limiting factor is how youre planning to dock. Get this right and youve lost your biggest bottleneck.
So why is it more comfortable to sail anything over 35 feet double-handed. Enigma is a 75 meter long single handed race yacht designed specifically for participating in the Observer Single-Handed Trans-Atlantic Race. Fiberglass LOA 34 Sloop.