My 2 cents on this airplane. I bought it from BCM for a steal and I think it provides excellent dollar value. It has a Tiger Shark .52 engine with the battery pack under the tank - no other weight added - balances at approx 3 inches from the leading edge. Flies very well this way - almost no up elevator needed for inverted flight. Knife edge flight is great at about 70% throttle. Vertical performance is virtually unlimited. Quite aerobatic if you push the control throw a bit. Weighs 5lbs 4oz on my digital scale. Builds quickly - got it done in about 8 hours. Lands easily. Glad I got two - they were so cheap - will put floats on the other one. Highly recommended ARF.