I can't overemphasize the need to add down thrust to the engine or it immediately wants to climb way too steeply when full throttle is applied during takeoff. I built a downthrust plate on the firewall at the getgo, which is about 1/8" thick at the top and paper thin at the bottom, to fit right behind the engine mounts. CG per plans was a bit too rearward on my first several flights, so I changed from a 4.8V to a 6V battery and moved it right behind the firewall from its original placement near the recommended CG. The plane will be a kitten after you make similar changes. Good luck and enjoy it! Jon