I learned to fly on the pt40 markII. and i used the trainer type wing with ailerons. there was another learning at the same time as i did he used the sport wing and it handled the wind a little better. But i put over three hundred flights on it before it was time to strip it down and retire the airframe. for an engine i used a thunder tiger GP42 and that was plenty of engine for it. i would'nt go any smaller than a OS 40la on a grass runway depending on how tall the grass is at your runway. i forget now but i used three and a quarter inch wheels due to the thick grass and cracks from the clay opening in the summer. It was a nice plane pretty sturdy also i put it into a tree once into the plowed soy bean field i don't no how many times. probably broke fifty props on it. and i never remember having to fix the wing. knocked the firewall out a couple of times though and bent the nose gear up numerous times. i'm glad i don't break props like that anymore. i'd go to the hobby store on a friday night and buy six props and i would come home on sunday with all six broken. thinking man i'm never going to learn to land. but yet the plane survived all that and yes i finally learned how to land. Good Luck on your plane.