Originally Posted by olianta
That's what I was thinking.
Kind of like the little wheels you add to a kids first bike until he learns to balance the bike. We call them "training wheels".
And once you learn to balance you take them off (with the rough grinder) because they hinder your counter steering.
Yes, that is a good description and it comes to the encounter of what I have been saying: Even more than speed they are there to make sailing easier and that's why they are mostly used on solo racing boats were a solo sailor needs all help he can get and not in many top many racing crewed boats were a big and expert crew does not need the help of chines in what regards control and as they can introduce drag, for them the trade off can be a negative one.
That's also why they make sense in cruising boats were a solo or short crewed (and sometimes inexperienced) will gladly accept all help they can get in what regards easiness of sailing.
Regarding performance cruisers, if they are sailed or raced by a top crew, their use (those little wheels) can be dispensed but if the same boat is sailed by a short crew or solo then that help can be translated in a superior performance (like on the solo racers) because that solo sailor, with that extra help, will be able to exploit better the boat performance and actually go faster.