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Post by badbrad on Apr 20, 2021 6:47:32 GMT -6
I have a 50HP 4 stroke merc 16.5' fishing boat. The boat is old 1999 and the outboard is 2006. The prop is pretty beat up and is just regular aluminum (they are aluminum right?). The kids like tubing behind it but want more speed. Does it pay in a motor that size to get stainless or should i just get what I have welded and re-machined? Not sure how much performance gain you get in a 50 hp size class with stainless.
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Post by badgerfowl on Apr 20, 2021 7:15:05 GMT -6
Performance out of a 50hp?
I think that’s about equivalent to asking will I get more performance out of my Schwinn if I pedal just a little bit faster.
Seriously, you might gain 1-2 mph. Don’t hit a rock with a SS prop though.
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Post by Freeborn on Apr 20, 2021 8:54:46 GMT -6
I have a 50HP 4 stroke merc 16.5' fishing boat. The boat is old 1999 and the outboard is 2006. The prop is pretty beat up and is just regular aluminum (they are aluminum right?). The kids like tubing behind it but want more speed. Does it pay in a motor that size to get stainless or should i just get what I have welded and re-machined? Not sure how much performance gain you get in a 50 hp size class with stainless. You have conflicting needs, more speed but you pull kids tubing. Those to combined means you need more horsepower. Stainless are more efficient then aluminum but i doubt your 50hp is causing the aluminum to flex and lose efficiency. You will gain nothing with the stainless for speed because you will need to drop 1-2 pitch to keep the same pulling power of the aluminum. If your current aluminum pops kids out of the water then you may have some opportunity but otherwise its a wash at best. Stainless are great for sandy or mucky lakes as they can chew through crap and not bend.
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Post by badbrad on Apr 20, 2021 9:27:21 GMT -6
Thanks guys. I kinda figured that was the answer. But wanted to check. The motor gets two kids out of the water on a tube. They just want to go faster than 25-28 mph.
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Post by badgerfowl on Apr 20, 2021 9:51:53 GMT -6
Thanks guys. I kinda figured that was the answer. But wanted to check. The motor gets two kids out of the water on a tube. They just want to go faster than 25-28 mph. Probably won't get anymore than 30mph, but that's probably minus the tube/kids. If you're getting 28 w/ tube/kids you're getting about all you can out of a 50 hp.
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Post by badbrad on Apr 20, 2021 10:21:26 GMT -6
Thanks guys. I kinda figured that was the answer. But wanted to check. The motor gets two kids out of the water on a tube. They just want to go faster than 25-28 mph. Probably won't get anymore than 30mph, but that's probably minus the tube/kids. If you're getting 28 w/ tube/kids you're getting about all you can out of a 50 hp. 28 is up wind with one kid on it. 22-24 going into the wind with two kids.
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Post by badgerfowl on Apr 20, 2021 10:31:00 GMT -6
Probably won't get anymore than 30mph, but that's probably minus the tube/kids. If you're getting 28 w/ tube/kids you're getting about all you can out of a 50 hp. 28 is up wind with one kid on it. 22-24 going into the wind with two kids. Seems about right.
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Post by benmnwi on Apr 20, 2021 12:09:08 GMT -6
My dad bought a better prop like you describe after his original prop found a rock. The new prop was supposed to add speed, etc., but it was maybe 1-2 mph and really wasn't noticeable. I wouldn't take the time to drive to the prop store to switch props one way or the other based on what we saw.
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Post by Catscratch on Apr 20, 2021 12:12:23 GMT -6
You're going need a bigger boat... (Brody)
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Post by badbrad on Apr 20, 2021 12:23:13 GMT -6
You're going need a bigger boat... (Brody) Yeah right. Nothing is for sale really new or used out there. Yes I know that was the jaws quote.
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Post by terrifictom on Apr 20, 2021 14:58:04 GMT -6
You're going need a bigger boat... (Brody) Yeah right. Nothing is for sale really new or used out there. Yes I know that was the jaws quote. Buy a new Ranger. Lol
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