I put a Webra 120 in mine with a Brisson muffler. I put the Elevator and rudder servos in the most aft position and the battery under the tank. It balanced right on the money and weighed a disapointing 9 lbs (30oz/sqft). The plane flys well and has very little control coupling. BUT, but, but it takes very little elevator to cause it to snap with any speed or power on. A teeny bit of rudder correction just results in a snap the other way. Amazingly it will do a level deep stall cleanly so it doesn't cause any problem landing. But its tendency to snap takes the fun out of a lot of maneuvers.

On the first flight doing straight and level trim laps at half power a piece of the plane came fluttering down. I landed and found that half of one elevator had broken off. The outer hinge on the other elevator was broken and the elevator was cracked and one side of the stab was cracked about 4 inches out from the fuselage. I replaced all the CA hinges in the elevator with real hinges and wire braced every thing. Now it's fine.