I also have the H9 edge w/1.60FX. This combo is great. It is not underpowered in anyway. Use an 18x6 prop and vertical is unlimited. Climbout is somewhat slower with a full tank of fuel but much better as the level of fuel decreases. This plane holds over one pound of fuel! So I try and burn off 1/2 of the tank before I start doing serious 3D. My plane weights in around 12 3/4 pounds. If I were to build this plane again I would use the same engine combo but would use pull-pull in the elevator using only digtal servos. Use the lightest wheels and landing gear (TNT) I could find. I like the slimline muffler on the 1.60 FX. With this combo the engine and all but the tubes on the muffler are inside of the cowl without any relief holes. The only holes in my cowl are for the needlevalves and glowplug starter. Looks great!