"1952-1960 dead zone."
Seriously? You mean two consecutive classes, "Old Time" and "Classic", have an 8 year gap??
That doesn't seem like it was thought out very well.
In the historic motorcycle competition scene I was a part of for over 10 years, each era is defined to within the year so no such gaps exist.
Andre
The same thing has been happening all along, people were building effectively obsolete airplanes from prior eras, and are still doing it. Heck, my current airplane is arguably an obsolete design from a prior era. In fact, next year it becomes eligible for "rolling cutoff Classic" or whatever we call it, and, I have the exact same engine and prop that I first flew it in 1995. That would still be about as competitive as it was then, and I am trying to drag it along with whatever remaining knowledge, experience, and skills I have managed to retain.
It's different in the era Dave mentions, just because the rate of change was drastically different and over the period of 10 years you go from a Stuntwagon/Ringmaster to a Shark 45 (the first Humbler was from 1959) along with a massive rules change. Stunt performance does not progress in a smooth progression, it has long stagnant periods interrupted by leaps of various degrees. I have my opinions about where those breaks would be, I am sure others have alternative break points, but there are definitely a series of step functions.
Given that all the "nostalgia" classes seem to be rapidly fading in attendance (along with the people who experienced it), I can't see breaking it up further, and even if you did, there would be maybe one or two designs that are better or far better than the rest. It's also why classes like OTS are more like semi-goofy fun flies rather than diehard competitions. Only a few people are really dead serious about OTS, Classic, "rolling cutoff classic", Super 70s, etcs, everyone else just does it as a lark to kill time on Saturdays.
Brett