
Originally Posted by
Jabbo
Great Question about the prop. Aluminum Props give you more flex and thus the Pitch Flattens out on Higher horsepower engines, This can be addressed by changing Diameter/pitch. Stainless Props Don't flex Near as much and are the best choice for performance. Here's the thing. If you want to buy a new prop you need to determine what is the most important to you. Hole shot or Top speed. Ideally you can get a prop that provides best of both worlds. Some people want top speed others will never get their boat past 30 mph. Your engine has a specified RPM range where it runs optimally. Your dealer can tell you this range.
Benifits to Stainless, It's durable, Can take a lot of abuse. That being the case, even with break away hubs, they can hit so hard so fast that you can damage the prop shaft, Gears, Splines etc.
Aluminum is obviously cheaper and doesn't cost as much to get repaired, however it gets damaged easier and can sheer blades. Also has More Flex at high speeds which will make you lose performance.
If it's a Small ding, I wouldn't worry a whole lot about it. If it's a big Ding, Quarter size, I'd get it fixed. I would also keep an extra in the boat along with extra nut/ washer(s) cotter pins etc.
One last thing. There is a company out there named Pirannah Props (I think) they are composite and have replacable blades. You can chane the pitch too. Their pretty neat.. hope this helps