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I have done some racing on an S&S 34. Your average speed will depend on many different things, not least the condition of the bottom (scrub regularly) and the condition of the sails (and how well you trim them, of course).
Obviously, most of the time, your speed is going to be limited by your waterline length. While an S&S34 will surf, it will take rather big waves, plenty of canvas and a good helmsman (they are, like most IOR design boats, a handful downwind). Sea conditions will also be a big factor... flat water is a different kettle of lemmings to swell or chop.
Taking a punt, based on my rather limited experience:
Hard on the wind, in 15 knots, you will do well to average 5 knots... less into decent swell / chop. Reaching, 6 maybe 7, again less into chop or swell. Running... 7 or 8 I guess, if you are prepared to fly plenty of sail.
The S&S34 if a great boat...you could certainly do a lot worse.
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