Richard,
Tail width at one foot off (OFO) is the keyword here. With an 11.0 m2 sail, forget the Futura 141. The UltraSonic is a perfect match with such a large sail.
Conversely, the Futura 122 is spot on with your smaller 6.7-9.2 m2 sails.
Cheers !
JM
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