who ever told you that wanted to sell a 3 blade its opposite. A. Two blade propellers are mainly used on yachts. A narrow two blade propeller has minimum drag for sailing. Also some two blade propellers are used on high speed racing boats. Three blade propellers are the most commonly used on all outboard, sterndrive and inboard engines. They normally give the best all round performance on boats to about 40 feet long. Four blade propellers are normally used on large boats where load carrying is a requirement; particularly commercial fishing boats. They are smoother than 2 or 3 blade propellers and as the diameter used is smaller, they can be useful where the aperture is restricted. Five blade propellers offer maximum thrust for minimum diameter. They overcome excessive propeller loading and are ideal for restricted diameter aperture. The are also very smooth, and reduce cavitation and slippage.
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