Mark, We used these starts in the Tasar Worlds in Australia with 122 boats competing and it worked very well. I have never seen this used in cat racing but can think of no reason that it would not work as well. The Tasar class used the ninth boat to finish as the rabbit for the next start. The idea was to get a fast boat but not the fastest. If it was the fastest boat then that placed too much pressure on waiting to start later because you would start part way up the course at the same speed as the fastest boat in the fleet and it removed the top boat's starting options. It is way preferable over using the black flag option.