Why run a stainless steel propeller instead of an aluminum propeller? There are several reasons why stainless is better than aluminum but before we can answer this question properly we need to understand a little more about props.

There are two important numbers that you need to know about your propeller. The first number you need to know is the diameter of your prop; the second number is the pitch. The diameter is just that - the diameter of the circle, in inches, that the blades make. The pitch is also measured in inches and is the distance that the prop will travel in one revolution with no slippage. If your prop has 11x13 stamped into it then it has an 11-inch diameter and is 13 pitch.

Now back to the original question, why stainless instead of aluminum? A stainless prop will get you up on plane faster, better handling, better top-end speed and is much more durable than an aluminum prop. This is true because stainless is much harder and will not flex. An aluminum prop, even on a 10 horse power engine will flex causing a loss in performance.

I talked with Gene at the Prop Shop of Cedar Falls and he agrees that stainless is much better than aluminum even if you're not looking for the performance benefits. Gene stated that aluminum just doesn't hold up as well as stainless even if you're careful. With multiple repairs to the softer aluminum prop for minor incidents that wouldn't harm the stainless prop, it makes the more expensive stainless a better value in the long run.

When purchasing a new stainless propeller make sure you match the diameter and pitch to your existing prop. Changing either the diameter or the pitch to a smaller number will cause your engine to run at higher RPMs, which could cause major engine failure. Going with a higher number, your engine will run lower RPMs possibly losing performance.

Price of a new stainless varies by size and brand but is a worthy investment. All is not lost with your old aluminum prop; accidents do happen so keep your old prop and carry it as a spare. You never know - it might save a fishing trip some day.

Gene will be at his Prop Shop booth at the sports show March 11 - 13 in the UNI dome, he'll be more than happy to answer any of your prop questions. I will be at the show also to answer any fishing questions or swap some stories. You can find me at either the Cedar Valley Bassmaster booth or the Hank’s Bait and Tackle area. Until next time keep your lure wet!