We are overstocked on the "B", 4.43:1 only, gear ratio power systems. Get a bargain here until they are gone. Normally priced at $18.
These power systems have the most efficient speed 300 motors you can get. All of them use the same motor at different gear ratios. GWS says not to load them over about 6 amps. However, I've had good luck loading them to near 8 amps. For this you'll have to do your own experimenting. The quality is high in these powerful motors. They perform best on 7 or 8 720 NiMh or RRC 2x1800 Polymer packs. 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.
 "EPS DX 370 B Power System")
