I am getting the magnum .91 to put in a TF .60 sized p-51. I am making it very scale, so a 4-bladed prop is a must. I figure, according to the 1 inch off for every extra blade, I would have to have something that was 11 inches. That seems quite small to me. I was reading that at the slower rpm prop wash doesnt have much effect, so I was wondering, what would putting a bigger 4 bladed prop on there do? I would want it for better looks and more thrust because its bigger and would swing slower? Does the engine get warn extremely fast?