I forgot to tell you that the YS 63 weighs, 18.3 oz (excatly, I weight it at the Post Office) w/ check valve, H9 fuel filter, and all the fuel tubing, thrust washer, standard prop nuts, and muffler.

I set mine up with hitec 225 on elevator, rudder, and throttle,
Jr 517 standard BB, on alerons,
1100mh batt.
8 oz hayes fuel tank inside wing,

4.5 lbs on my old fruit scale,