Dick, I agree that Graupner props are second to none. But their size selection is quite limited. I have a 14x7 and 16x8.

What I am looking for here is a combination of pulling power (as opposed to speed) and braking effect. The airplanes I'm flying have super light wing loading and lift ratios; in no wind, they are difficult to get on the ground without spoilerons. The lower the prop pitch, the better.

In fact, that 16x4W is amazing. When you throttle back, it is like throwing out a drag chute. You can SEE the model visibly slow down as if a brake was applied on a car. But it makes an eerie howling noise at full throttle, and that concerned me. It sure sounded like the engine was overspeeding.

Steve