I would be pretty shocked if you get to 25knots on an F18. During the Tybee500 last year on a Nacra 20 with a stiff offshore breeze and us hugging the shore, we were death reaching (main and jib only) while Frank was reading constant speeds in the 19-20knot range. A "gonzo" blast, that didn't show on the water, nailed us and the boat nearly accelerated out from under us. Frank dropped the GPS to his chest in lieu of something to hang on to and I was busy kissing my butt goodbye. I couldn't believe that the decks stayed above water. Frank checked the GPS later and the max speed was now slightly above 25knots. 25knots is narly.