As the intention of both events is to have a fun event that relives the past, giving obsolete designs (and presumably technology?) a competitive chance, shouldn't there be more incentive to use period correct equipment? Classic has the benefit of fidelity points, which could include a bonus for the engine, but OTS really only rewards ignition. Unfortunately, as modern power becomes increasingly more popular in these events it puts the individual who takes the time to use authentic equipment at a disadvantage. Take away the vintage nostalgia of these events and you're basically running Beginner stunt open to everyone, and another round of Precision Aerobatics. It seems to go against the purpose of the event to allow anything and everything.
At one time it was somewhat difficult to obtain period correct engines. However, anyone can get on Ebay and bid on the real thing. There's a never ending stream of collectors clearing their shelves, and estate sale finds. Often good usable stuff goes cheap! Most spark ignition 60's don't cost as much as some of the purpose built engines some people are running in classic. Sure the old stuff can be a little more finicky, but isn't that the point? If there's no challenge then how is it competition?
No debate, just a viewpoint.