HBZ-1228 T-28 Trojan 450mm RTF with SAFEDuet S 2 RTF, with Battery and Charger Overview The HobbyZone Duet S 2 is an updated and upgraded version of one of the best selling and lowest cost hobby quality trainer models available for learning to fly radio controlled (RC) airplanes! It's ultra micro sized so it can be flown in large yards, small parks, baseball fields, and other suitable spaces where larger models can't typically be flown successfully by first time pilots. And now it's