We hear from lots of customers who buy the wrong props (from somewhere else) for their Yamaha 60-130 hp series outboards. They have a 17 pitch aluminum, or OEM stainless, then buy an aftermarket prop of the same pitch. Then they lose lots of rpms and performance.
The reason is that the OEM style props are semi-cleaver designs with very little cup. They are easy to turn, and typically have less rake and cup than an aftermarket prop. You can identify them by the straight trailing edge. The stainless OEM props are painted black. A "normal" aftermarket prop, with more rake and cup, will usually turn less rpms. It's most common with stainless propellers.
When replacing an OEM style prop, we'll make sure we sell the aluminum prop from Michigan Wheel or PowerTech (pretty much identical to OEM) or an OEM-style prop from PowerTech (the SCD style). That will provide performance like the customer is used to. If the customer insists on an aftermarket style (for price, or to use a replaceable hub kit, like the Flo-Torq), we'll drop a couple inches of pitch.
This is reason number 1000 to talk to a prop shop before you buy a prop. Internet buyers, beware!
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