Actually it balances perfectly......I have a 6 volt 2400mah Rx battery and a 4.8 volt 2000mah ignition battery under the shelf behing the back seat. The plane weighs about 15 pounds dry. Thats why I can't believe a Sig clipped wing 1/4 scale cub could possible tip the scales at 19 lbs. I would have guessed 12 - 13 lbs depending on the motor used.
A Saito 125 or a Zenoah 20 EI should be perfect for that weight.......but 19 lbs......[X(]