Turning Point 15.625x13 LH Mach3 OS Stainless Propeller

The large-diameter Turning Point Express Mach3 OS-1613-L is a left-hand, three-blade stainless steel propeller with 15.625 inches of diameter and 13 inches of pitch. The OS series was developed for larger boats where a broad blade sweep can improve acceleration and bow response. Its left-hand rotation suits the appropriate drive configuration rather than a standard right-hand setup. Turning Point lists high-horsepower bay boats, offshore center consoles, and larger pontoons among the intended applications for this series.

The OS blade shape uses revised cup, leading and trailing edges, and progressive rake. Turning Point specifies its TP17 stainless alloy and large exhaust passages through the propeller housing. The manufacturer describes the OS range for selected 90-plus-horsepower outboards with 4.75-inch gearcases and certain compatible sterndrives. These are series-level applications, so the exact engine and propeller fit still needs verification.

A separate engine-specific Turning Point hub kit is required before this housing can be installed. Verify the unusually large 15.625-inch diameter for gearcase and hull clearance, and make sure the drive calls for left-hand rotation. The 13-inch pitch should be evaluated against the engine’s actual full-throttle operating range. Compare related stainless steel propellers for other available sizes and hub kits.

• Large-diameter OS profile with revised blade cup and rake
• Left-hand three-blade configuration for compatible drives
• TP17 stainless and high-flow exhaust housing
• Engine-specific hub kit purchased separately