ORIGINAL: cmoulder
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!
1660 squares and 15 1/2-16 lbs is quite doable with standard material. No exotic composite stuff necessary. The wing will require improved aerodynamics compared to the ultimate's, making it a true 2 meter.
A BME 58 cc on pipe puts out 6 1/2 horses and would power the thing at about the right power loading as the better E or 175 set-ups. The BME is lighter than the DLE and delivers more punch but has carb location that makes it impractical for skinny Pattern fuses.
This particular bipe will also need enough fuse volume to compare favorably. The tail moment is not an issue