Just got a 4S replacement motor for my FLEX Innovations 300 and was trying it out when one of our club members made a visit around our field in a fullscale. That was fun, but as for the conversion, in my opinion, the power gain was unimpressive, using the standard 3S propellor. I'll check amperage draw with various other props to see if I can find something that will make the ~$50 cost worthwhile.