Well, I may be wrong, after all! No, really! I just now read Randy's pinned post at the top, and it does say that OTS and Classic models would be eligible to compete in N30. I was sure that they were not, in order to encourage building N30 designs. I don't see much incentive to build an N30 model coming from allowing Classics to compete in N30.
What got me confused was the bit about flying N30 together with Classic, same circle, same time, same judges. But you can't enter both events, even with a Classic model. No, you can't enter two models, either. Why not??? But say you have one fella entered in N30 and 10 in Classic. Smart money says to enter N30 with your Classic, if you want another dust collector. Of course, most the Classic guys will just enter Classic, being more interested in competition and all that noble stuff. If you don't enter N30 with your Classic, then that poor solo guy with the N30 plane will take home the 1st place dust collector and feel like it was a hollow victory, ya know? No, I don't see how any of this is a good thing. I'd vote to make folks fly N30's in N30 and Classics in Classic, and if they want to enter both, with two planes, that's fine.
Unlike the Profile Oriental and Profile Cavalier, nobody has stepped up with proof of a Profile Nobler that was Nobler based, prior to 1/1/70, AFAIK. Yes, there's one in PAMPA's plans list, but it has nothing in common with a Nobler of any vintage, except that it does have the propeller up front. That was in my first ever issue of Stunt News, see? Now...the NoblARF wing is related to the '57 Nobler (aka Greenbox), but no profile version existed, so a profile fitted with a NoblARF wing is not Classic legal, so it's not N30 legit, either. That part is pretty simple. The Custom Models (?) kit of the "Profile Nobler" came out in the '90's, so that's not N30 legal either, because it's essentially a new design, based on the Nobler. At least for another 15 years or so. That's also pretty clear. If you have a NoblARF wing, then you can build the rest of the '57 Nobler for it and fly that in N30 or Classic. PSJ has the plans for the '57, I'm sure. If anybody asks, just tell them that the wing was custom built for you by Wu "Bobby" Chong and you're golden...
Steve