I very much like this idea. How long do you think the measured distance should be -- one nautical mile? Use stopwatch or GPS?
I think that 1 nautical mile would be about right. If you averaged 20 knots, then it would be 3 minutes elapsed time.
You could use GPS or stopwatch, however, getting stopwatches at the start and syncronized with the finish might be difficult if not on the boat (RC?).
I think you would want to divide the "records" into classes. I don't expect that Bill Roberts on the RC-30 would be especially proud to show that his boat beat the H-16 record, but would like to show the rest of the RC/ARC enthusiasts just what that beast will do. And I think all the H-16 guys would like trying to do the best 1 mile time of all H-16s, not really caring if it was faster than a Fox or Tiger or H-18. In the beginning, it would be fun to show all the people who attempted the 1 mile run, type of boat and average speed. I would also like to see what the true wind direction was relative to the set course (beam reach, broad reach w/ spin, etc.) and wind speed.