ORIGINAL: Javier-RCU
These things are very tail heavy. Most are flying with nose weights, even with 120 four strokes.
I wasn't aware that they came in tail heavy. Mine weighs 12#s with a ys-1.20 fourstroke. I builted it according to the plans with a few minor changes, but the tail area is stock other than a retracting tail wheel. I didn't need any nose weight.
Ron