Using the GWS DXA motors and gearbox, same as in the GWS Tiger Moth. The props are GWS 9-7 cut down to 8.5 diameter. Both props rotate in the same direction as reverse pitch props were not available for electrics when I built it a year ago. Since then, I understand that MPI now has reverse pitch props available for small electrics so I would suggest using opposite rotating (left and right hand) props for someone building a new one. The batt pack is the 8 cell 720 NiMh pack. It weighs 14 oz. ready to fly![