I'd have to agree that going to gas in the 35 to 50cc range is gonna be way better in the long run but for IMAC it is not required. As has been mentioned, in basic if it has wings, bring it. I've seen guys using Four Stars for basic and doing well. IMAC is all about the proper setup of a given plane as well as flying each maneuver properly and that goes from basic all the way to unlimited but once above basic, having a scale plane is required. Basically the rule is if it has flown in a real IAC competition it can fly in IMAC above the basic class. That means some high wing planes are legal in IMAC such as a Decathalon. I'm all for being the person that goes against the norm and I find the Sukhoi series to be a much better IMAC plane (let the flaming begin ) if properly setup and the new H9 version certainly fits the bill if you take the time to properly set it up and re-glue the snot out of it. Right now I fly a C-ARF Extra 260 in IMAC but have owned the Sukhoi and did the trimming work on it and was all ready until it literally blew the aileron off the right wing panel.

Proper plane setup is everything for IMAC or any type of flying for that matter, it takes a load of work off the pilot and in IMAC and 3D the less you have to correct in the air, the better. You can easily end up doing 40 to 50 flights to get a plane setup correctly, though they will be very short flights.

This years IMAC ship and me at Woodstock CT