I am new to the forum and currently looking at a model 4-1200 with a 583 Rotax engine. the plan is not completely finished. I tried to locate some threads on the forum talking about the performance of the 583 but did not find what i was looking for. I guess I would like to know what people that fly a KF with the 583 feel, is it under powered? what kind of usefull load do they have, I live in AZ. and wonder about the summer temps. Also any thoughts or issues I shouldwatch out for on this model? Any help is apreciated.