Here is the history from my point of view. Around 1970 i wanted to fly Class ll and realized that my McCoy was not going to cut it. Everyone was using the beautiful Rossi .60 so I got an OPS! It was a huge learning curve but in a couple of years I had it working pretty good. With the MO-1 the pipe ran under the wing so it was fairly unobtrusive. It was a little slow coming off the deck but in the air it was awesome. High speed times were equivalent to or a bit better than the Rossi's. I flew it at the '73 Nats and at the Cleveland meet once so it was seen around the country a bit. Maybe some of you folks remember it?
Previously to this there were no rules but people started thinking, and maybe they were correct, that, on most ships a pipe would spoil the appearance of the plane not to mention the more than incremental increased speed potential. So, they made a rule of no mufflers of any kind and that stuck for many years until they came up with the current rules. I sulked for a few years but eventually converted the OPS to run open face and built a new plane. It still held it's own against the Rossi .65's of the day. All in all, good memories! TS