Macgregor 26X. motoring with 50hp I could go about 16 mph, motoring with the wind and waves less than 3` I could hit 19.5 mph.. Riding the bow waves of freighters I could hit 20mph..
Sailing into the wind, maybe 6 mph max, but not a very good pointing boat.
Off the wind (45 degrees)with no water ballast, crusiing spinnaker, 20mph winds and 3 foot waves, my gps was showing speeds of 11.2 mph. Erie to Port dover Canada I averaged8.8mph. (55 miles in less than 6 hours) I owned that boat for 9 years and could never reach match that speed again. (didnt want to risk capsize without ballast,)