Sorry I didn't tell you about the inherent dangers of electric flight. One touch of a switch or throttle control and you have a prop that goes instantly to full power. A lot of glow flyers learn the hard way. With glow engines that problem will not occur unless the ni-starter is on the plug and the prop is pulled through. Just because glow engines are usually larger and swing larger props people are more careful. They forget that glow engines will give you an audible warning by popping. Electrics don't say anything they just start swinging. The props may be smaller but they cut just as deeply. If you haven't already done so try smoothing the edges of the prop with a bit of sandpaper. Not enough to change the airfoil shape just enough to lessen the knife edge. The leading edges should be more or less rounded in any case but the trailing edges are sometimes very sharp. As to NiMh batteries it is true that they will give longer flights and do not have a memory. With this comes some small disadvantages. Most NiMh packs will have one more cell than a regular nicad for the same output. The nicad gives instant full power whereas an NiMh takes a couple of instants to reach full power. Usually not very noticeable.