depends on what 30cc you are talking about. The 3dhobbyshop 30cc planes are 70-74" in wingspan depending on the plane, and typically weigh in at about 10-11 lb. The ExtremeFlight planes are typically 74-76" wingspan (The MXS says 83, but that's with the tips on, without them as many fly it, it's really 76") and weigh in at a heavier 12.5-13.5 lb, and they are really 35-40cc planes. The EF ones fly much closer to a 50cc plane, yet more manueverable. Still able to handle wind nearly as good as a 50cc plane, and nearly as "big" feeling in the sky too. The 3dhs ones (or any other 10-11 lb 30cc plane) won't feel quite as big. Personally I prefer the EF planes if I'm building gas, as they feel nearly as big as a 50cc, yet retain the maneuverability/agility of the 30cc planes, and transport just as easy as the slightly smaller 10-11lb 30cc planes. And much easier to transport than the 50cc birds! If I were building an electric, I would use the 3dhs ones, as they are easier to power in electric, often able to get by with a single 6s5000. In particular the 70" Velox... Love that plane on electric. And it's one of my favorite all time planes as well. But for gas, the EF 35cc class is really really nice. I have their 76" MXS with a DA-35 and love it. A buddy has the 74" Laser, and I've flown it and love it also.
