Kristen,

As for the props, MAS (Master Air Screw ) [the black ones] are a lot more forgiving of prop strikes, but they are not as efficient as an APC prop (the grey ones ).

For a 46, I suggest something in the 11x5 - 11x7 APC range for general sport flying. If you will be using MAS props, go one higher on the pitch for comparable performance - for instance, an 11x6 MAS has ABOUT the same performance as an 11x5 APC prop.

You will also find that the APC props are quieter than the MAS props. If noise is an issue where you fly, keep this in mind. The APC props tend to be a couple of db less noisy.

The largest use for MAS props, IMHO, is for trainers or if you need a plane to slow down more for landing. My SIG Rascal just floats across the field on landing with an APC prop (had to kill the engine to land ). I switched to a MAS and now it lands nicely.

To balance a prop, get a dowel that is a SNUG, NOT TIGHT fit for the REAMED OUT HOLE. Set the dowel on a couple of flat surfaces and see what the prop does.

When it is balanced, it should remain in the position you place it in. If one tip drops, PAINT a small line on the tip of the lighter blade (1/8 - 1/4" wide ) with some dope, let dry, and recheck it. I think you will find that very few APC props require balancing.