I posted this as a response to another thread, but it didn't show up under new posts. So I posted it as a new thread in hopes of getting responses. I am thinking of buying a 1968 Tartan 34C. I am use to sailing a Cal33 and Pearson36, which are both club boats. I believe the waterline on the Cal is 27.5 feet, which is adequate for me. My concern is the waterline of the Tartan 34 which is only 25 feet. Will I notice a decrease in performance (speed) with the T34? The seller said under power the boat can easily exceed 6 knots, which is adequate for me. Does this sound right? And is the water line extended when heeling and if so does that make a difference in performance?