BK117 is the 1/5th scale Robbe and is electric powered by the very best electronics. Futaba servos and CGY 750 Flybarless Gyro. It runs on 12S (2x6s packs) and the batteries are unused except for one pair which has had 2 cycles. Model flies great and flights of 15 mins are easily possible on the 12s 8000mah setup. Has been professionally painted with 2 pack clear. This is a big model 2.3m Long and 2m rotor diam. Lots of spares included, Model is setup on Futaba 18MZ and the files will be supplied.