narrow groove...
so... for the olympics... EXACTLY the boat you would want to sort the men from the boys!

They have to stay in that groove AND find wind, change gears and race their competition. When they get it right... its real fast!

It's the old Bill Roberts adage... you don't sort out the best drivers in the world using your family sedan.... you need a formula 1 for them to demonstrate all of their skills and only in this class can you truly get a top guy to emerge based on skill and not luck.

The down hill is not run on the bunny slope either. (I am paraphrasing)