Maybe the box I suggested is too big. I just took the size from the AC-75 class we were discussing then.
There may also be more clever ways to limit the size than having a fixed box, the boats have to fit in.
Also I would prefer a competition open for different technologies. I think a development of the simple box or just a sail-area limit can allow that.
I think the America's cup shall be sailed in the fastest and most extreme course-racing boats that exist. As it was 170 years ago, when it started. That is the beauty with this competition. The boats don't have to be affordable for anyone.
Although most sailboats are still sailing without foils, there are some foiling dinghies and multihulls available for the general public. When we can improve them, I am sure that market will grow.
I fully agree, that a multihull is the most practical platform for a sailing hydrofoil substantially above the dinghy size.
The AC was NOT sailed in "the fastest and most extreme course-racing boats that exist" 170 years ago. America wasn't the fastest thing that existed - she was much slower than Maria. When America's owners wrote the Deed of Gift, they banned Maria, which was the fastest and most extreme big boat of her day. When they instituted the requirement that boats be sailed to the venue, they effectively banned extreme boats.
The early AC boats were just normal big boats. Cambria was a typical big schooner of her day. Livonia was a noted slow boat. Galatea was a live-aboard cruiser for many years. Many of the defenders ended up as trading boats, like America herself was.
Even moving into the L x SA era, the AC boats were not theoretically the fastest boats - Satanita rated faster than Valkyrie II, for example, and several other boats of the time (Navahoe, Britannia, Meteor, Ailsa, Satanita, Aurora, Calluna) that had nothing to do with the AC were just about as big and fast as Valkyrie II , the Js, etc.
The AC boats were not the most extreme of their time. The smaller Raters were more extreme. Cartoon, Outlook, Glencairn etc were all more extreme in design than any AC boat ever built in their time. The Js were definitely not extreme and as their designers often said, they lagged behind smaller boats in development. The 12s were never the biggest and fastest course-racing boats of their day; the Ms (which still existed as a small class) were always bigger and faster and for much of the 12 Metre era and the IACC era, the maxis and offshore multis were faster and bigger and more extreme.
Historically, the AC boats have normally been big, fast versions of "mainstream" design. They haven't been extreme. Any belief that the Cup has traditionally been sailed in the most extreme designs is utterly wrong.
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