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All of these power systems use the same motors at different gear ratios. GWS shows setup loads from 16 to 25.3 amps.The quality is high in these powerful motors. They perform best on 7 or 8 cell KAN1050 NiMh or RRC 2x2000 SHD Lithium Polymer packs. 2 Cell Lipo packs are possible also with prop size adjustments. Remember, the higher the ratio the greater the static thrust at a lower speed. Choose wisely. By purchasing a few different props you'll be able to make adjustments to static, inflight thrust and pitch speed of your power system and come up with the best combination of performance for your bird. Assembly weight 133g/4.7oz.