I have a MVVS 1.6 Gas engine in mine with servos in the tail. I have 2 x 1200mah rx packs just behing the wing tube and 1 x 1600mah ignition pack on the side of the motor box. My CG is right at 5" from the leading edge of the root and seems to be about perfect for my flying style. My engine with the ignition, battery, and muffler is right at 41oz. I think the OS 1.6 is about 33oz without the muffler. That only makes a difference of about 5 oz between the two, yet some of you are having to add over a pound of lead???? There may be alot of variation in the wood quality in these things. I guess you get what you pay for.

Mark