12 footer dies on waterline length against 16 foot boats.. A better comparison would be 12s vs Kitty Cats (can you look that up on the vyc yardstick dont have time)

16teens arent unlimited skiffs (neither is the 49er) So a fair comparison in the 16 foot length isnt available.. Although around the standard 49er course I doubt if that many cats will take one..

One can compare 18 footers vs F18HT and F18.. My guess is the F18 will lose the F18HT may be about the same or a little faster..

As for spreaders.. 12, Javelins(14 foot), 14s all have twin spreader rigs if not triple.. 16 & 18s have three or even 4 spreaders..