First off the Carden 35% Edge was designed around the DA100. Second it was designed to have the rudder servos on a pull pull system in the fuse right underneath the canopy. Mine balanced out right were the plans call with no additional weight anywhere. The rudder servos are under the canopy and it has a DA 100 on the front. On of my flying buddys has the same setup except his has the 3-W 106. He needed some nose weight to balance out the difference between the 3-W and DA. If you get a BME it will take at least 1 1/2 lbs to balance it out. And they shake like paint mixers. BME makes its power with RPM. DA and 3-W do it with torque. Torque is everything when you have zero airspeed and no altitude. Just get the DA and you won't regret it.