IMHO you may have trouble finding a 26cc that will 3D a plane with plenty of punch. Usually 40CC is kinda the break point to get a gasser that will 3d and have a fairly light wing loading. You are looking at something in the 74" wing span range like the EF Yak with a good 40 cc engine. That is not to say you can't do 3D with a 26cc engine with the right airframe. It just doesn't give a large margin for error if you get out of shape. The ability to punch out of a manuever when needed is the insurance to 3D down lower than 1 mistake high. Again this is just my opinion...
Jeff