Himax HC3516 Outrunner Brushless MotorsHC35 Outrunner250 450 Watts Wide application ranges 9 motors in 4 frame sizes, Heavy duty motor mount, prop adapter & connectors included, Advanced designs dual ball bearing & powerful magnet, Replaces Axi 28 series motors. HC3516 This 350 watt motor is for midsize models weighing 34 45 oz for 3 D flight, up to 56 oz for aerobatic flight and up to 70 oz for leisure flight. For two cell LiPo applications use HC3516 1350 For three cell LiPo applications