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Simon, I must read trough my collection of old "Multihulls" magazines to back up this, but I think the boats racing in "Thomas Crown" was Formula 40's (or Prosail 40's).\

They are Formula 40's. Here is the white one, and I THINK this is the other.

Andrew Tatton Nacra 20 "Wiggle Stick" #266 Nacra 18 Square #12