ACME 540 3 Blade 13" x 12" Propeller
The ACME 540 3 Blade Propeller is nothing like 3 blade propellers of the past. Prior to 1999, wakeboard and ski boat propellers were cast from molds, a process that offered little precision and had severe limitations for the size and shape of the blades. The result was inefficient props with small blade surface area and poor balance which caused vibration in the boat drive line.
All this changed when ACME revolutionized the manufacturing process by implementing CNC machining. Precision machining of its wakeboard and waterski boat propellers allows ACME to hold tolerances and achieve accuracies never before seen in the propeller industry. Which results in larger surface area props that are more efficient and perfectly balanced for silky smooth operation.
What does that mean for you? The new ACME 3 blade propellers are now capable of providing you with the same holeshot and top end performance that many 4 blade propellers deliver. Whether you want to make your old ski boat feel like new or improve the performance of your new wakeboard boat, the ACME 540 3 Blade Propeller will get the job done.
The Acme 540 prop is, well all I can say...awesome. Better hole shot, lowered bow, lower RPM with 3 mph improvement and literally zero vibration. A dramatic improvement on my 1988 Ski Nautique. Note...the federal prop that was OEM has a slightly longer shaft length so a nylon washer was needed to shore up about 2 millimeters in front of the lock nut.
As for the hardware kit. The lock nut is larger diameter (on the outside) than stock and the cotter pin included was too short. The new key was fine. I stuck with the original nut and bought a longer stainless cotter pin at the local hardware.