You may be expecting the impossible.
This to me is a touchy subject. Owner wants to improve motoring performance. ie motor faster. The response commonly is put a bigger prop or a 3 blade prop or increase pitch and you will motor faster. Often this is incorrect. Now back up a moment. If in fact the boat does not have the correct prop for the boat/engine combination then yes improvement is available. However, if you've got the correct size & pitch two blade prop now changing to a bigger/3-bladed/increased pitch prop is not going to help. It will only overload your engine. The correct prop is the maximum size/pitch combination that your engine can turn. Anything more than that and its overloaded. So... If your hoping to get more speed in flat water by switching to a different prop don't hold your breath. Unless you have the wrong prop now, changing to a 3-Blade for instance is not going to make a significant difference IN FLAT WATER. A 3-Blade will keep the boat moving better in chop or headwinds, but not a calm day in flat water. Keep in mind you are limited by the length of your waterline and the horsepower of your engine. A different prop won't get you past these limitations. What size prop do you have now? If it's a 13 x 9 2-blade it is probably the correct prop for your boat. A 13 x 8 3-Blade will give you an advantage in adverse conditions, but that is about it.
