I'm remembering all my conquests now
Two are notable... well, two other than the monster I showed previously. One was a superlight, super-compact D powered model that shredded with a bang a ways before it would have hit burnout. I'd exceeded VNE
Apparently you can only fly balsa and mylar so fast...
The other was a two-stage powered with long-burn C engines. Very sleek and optimized for drag. Optical measurements put it at 3400' and even with streamer recovery it drifted out of our area.
As for the small stuff, I remember that there are 1/4A and 1/2A engines out there for rockets that aren't much bigger than a 50 ring cigar. There is, or used to be, a model out there that is not much more than one of those small engines, a nose cone, and three swept fins. On the eject charge it just blows the engine out and the CG change is enough to make it tumble down, like a leaf.
Believe it or not a lot of the bigger single D models were suitable for small fields; they're so big and draggy they won't hit a thousand feet.