Ienjoy seeing how small an engine Ican get away with on my planes. The GP Escapade is samewhat heavy .40 size ARF with a high wing loading but good manners and Ifly mine with a .36, It flies just fine, plenty fast enough for my relaxed flying style.
Irecently installed a Magnum 30 four stroke on my .25 size Sig Kadet Jr. It hauled it around great just not in much of a hurry, Ilike it.
Ithink Iwill try one of those new 4 star .20s with a Mag 30 in it.