Re: Prop pitch versus diameter
Once again prop diameter is a function of prop design. If these two props are identical in every respect except diameter, the 14 inch will spool up a bit faster and provide a little better hole shot for skiing/water sports. The 15 will provide a bit more top end. When we talk about prop diameter we try to convey that props are designed for a specific engine or range of engines. You would not obviously attempt to put a 15 inch diameter prop on a 40/50 HP Merc triple with a small gearcase as it simply would be way too large. What happens with prop design is that as pitch increases, diameter decreases slightly (1/4 inch diameter is typical/inch or two of pitch) PROVIDED the prop is from the same manufacturers, same series (model) and same material. One inch in diameter change is significant and you can expect performance differences. If in your example, both props are identical and both were actually designed for used on that outdrive, then there is the obvious advantage that goes with the design (do you want towing ability at the cost of top end, or do you want top end at the cost of hole shot)? That's why there are two props available. Only you can decide which one is right. One will put the engine at the top end of the rpm band with an average load. One will not.
