I went from a aerobird challenger to a sturdy birdy 2. In makeing the transition I had to learn the ropes w/glo eng. not to bad, I'm a mech. 15 = years. With that said I still researched and learned about these eng. proper use break in safety ect. I still seem to learn something every time I go on line. My sturdy birdy 2 is a ARF kit + os.fx.25 built w/airlons. once finished had exp. flyer at hobby shop check it over, point out problems + give corrections also reviwed eng tunning tech. I ve managed many sucsesful solo's w/ only minor problems. I fly in remote area , no pun intended. I treat my plane like a loaded gun this works for me, I had one 1 hr flight sesion w/ a inst. who said I was doing great take off landing's ,orientation. I rec proceding carefuly if you must learn on your own, I highly rec. the sturdy birdy 2 54$ + wheels, gas, tank,eng,field gear most of wich can be used on future planes. I have a hanger 9 arrow trainner I havent flown yet dont know if I,m ready yet like i said I take it easy.