RE: plane rules
For Basic IMAC......
Any plane will do. Can be glow/gas/eletric.
Can be small/medium large
Can be an aerobat, trainer, pattern plane, warbird etc.
The only thing you need to remember is time.......You have to fly the sequence twice, and are supposed to takeoff during the last 2 manuevers of the person before you.....this puts you in the air for approx 10mins. So conserve fuel if your tank is small
Planes that have advantage (in no particular order).......cap/giles/extra/edge/yak/sukhoi. These tend to present the manuevers the best.
Once you move out of basic.......look to have a 50cc or larger plane (most fly 35% or 40% planes). And your plane must meet the 10% scale rule of an airplane that could fly full scale competitons.