A simple and relatively inexpensive upgrade for this arf is the addition of yellow aircrafts foam wing set for that plane, i added them to my plane and it was a night and day difference, the landings are rock solid and forward flight requires 0 trim change between hi and low speeds. the only problem i have with mine is no matter how perfect the landing is, the gear mount falls out, i have so much epoxy and doublers in there i think i doubled the weight, hehehe.. i use a .52 4 stroke and it is way powerful, but wouldnt trade it for nothing, i put a 2 ounce fuel tank vented to atmosphere with the feed line running to hand made spray bars on the trailing edge of the wings underneath the ailerons, i use a micro servo that pinches the line to stop flow, and i put in food color dyed green water and do some slow crop dusting passes, the negative pressure across the rails pulls the water out and atomizes it perfectly, you just have to remember to vent to atmosphere or you creative a vacuum in the tank and have no flow. well, have fun ...