I have been flying my Sig Wonder for 3 or 4 yrs. It weighs a tad over 34 oz. It has a OS 15FP, 270 maH, 2 high speed Futaba micro servos, and S148 on the throttle, a 2 oz fuel tank, and 2 servos are taped and then CA'd. It is light, and lightning quick. I bought a OS 25FX for it but decicded otherwise. Big engines are only useful if you are pulling a streamer. I also used the Russian tails. Its covered with MonoKote. Use different colors for the top and bottom of wing. If you are seroius about weight get rid of the throttle servo, I'm considering it. Weight reduction is everthing for a fun time with a Wonder.