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Old 02-03-2015, 05:57   #1
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Outboard prop material

I spun the prop on one of the 9.9 Yamaha outboards that power my Seawind. I have a choice of stainless steel or aluminum for the replacement and aside from general experience I have no idea which one to pick. As the captain I am in the position of being able to ask for advice with out having to follow it so fire away.

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Old 02-03-2015, 06:10   #2
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Re: Outboard prop material

Aluminum, cheaper, but less efficient, but does this really matter at hull speeds?
Also it's redneck knowledge that if you hit something really hard, an aluminum prop will break, if you hit it with a SS prop, the gear case will break. Yes, both have rubber hubs.
SS is prettier, but I go with aluminum on little motors, but SS on bigger higher HP boats where efficiency matters more.

Seeing as how it's very un-likely you'll ever hit anything with a prop, maybe the SS is worth the extra money to look pretty?
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Old 02-03-2015, 06:12   #3
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Re: Outboard prop material

If the prop isn't damaged, it can be rehubbed easily. We had ours rehubbed for $25 - took the guy a couple of minutes with a press.

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Old 02-03-2015, 07:03   #4
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Re: Outboard prop material

Agree about the rehubbing. I am planning to head to the Bahamas for several months and think it wise th have a spare.

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Old 02-03-2015, 07:41   #5
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Re: Outboard prop material

Who's buying?

For a displacement boat, SS may look pretty but no way can you justify the up front cost.
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Old 02-03-2015, 07:47   #6
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Re: Outboard prop material

Quote:
Originally Posted by tomfl View Post
I spun the prop on one of the 9.9 Yamaha outboards that power my Seawind. I have a choice of stainless steel or aluminum for the replacement and aside from general experience I have no idea which one to pick. As the captain I am in the position of being able to ask for advice with out having to follow it so fire away.

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If you have multiple outboards powering your boat, it makes the most sense to buy a prop that's identical to the others. You would want the same performance characteristics from each engine.

As others have mentioned, repair may be the best option.
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Old 02-03-2015, 12:59   #7
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Re: Outboard prop material

For a alternative suggestion I tried a nylon blade on my 9.9 Yamaha and picked up 1/2 a knot in speed and better fuel economy. The downside is it is easier to chip the blade than aluminum.
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Old 03-03-2015, 16:19   #8
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Re: Outboard prop material

I am a Seawind agent in Australia and my own cruising /racing cat that has 2 x Yamaha 9.9 engines. Brilliant motors! Because you are pushing big loads you will find you'll spin a prop every 3 years or so. You must carry a spare prop. Stick to what Yamaha originally supply because they work. "Keep it simple & reliable " is my moto. I always get my props rebushed for about $50 at a local prop specialist.

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Old 03-03-2015, 22:41   #9
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Re: Outboard prop material

I'd stick to the original article too. You know it works and it's going to match the other motor. If you're doing a lot of marina manouvering, a heavier SS prop will be tougher on your gearbox too.
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