I think Brett is referring to biplanes. A 2-meter biplane could potentially be huge and still fit within the 2-meter box, although the tail moment might render it unsuitable for pattern.

Here are the specs for an Aeroworks ultimate 50cc:

Wingspan: 68" (173cm)
Wing Area: 1666 sq in (107.63 sq dm)
Fuse Length: 74" (188cm) rudder to front of cowl
78.5" (199cm) rudder to front of spinner
Weight: 17.5-18.5 lbs

With no weight (and noise) requirements this could be your next pattern plane!