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Thread: Alum vs. SS props

  1. #1
    Member Bullelkklr's Avatar
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    Default Alum vs. SS props

    I recently tried out an aluminum prop because I tried to dig a channel in an underwater island. Here's my findings:

    Boat is 2015 Hewes 220 ETHT Ocean Pro. Motor is a 3.3L Yamaha F250.

    15-1/2" x 17P Yamaha Saltwater series II EDS prop SS WOT 6100 rpm and 44mph with 2 people, 2 dogs, and 85 gals fuel. Best fuel econ was 3.2mpg.

    15-3/8" x 19P Solas Rubex Aluminum prop. WOT 5500 rpm and 40mph with 25 gals fuel and 1 person. Best fuel economy while the boat was light was 3.7mpg. The holeshot and low/midrange torque sucked. I was still able to get on step with way way too much gear and extra fuel but it was a slow go getting there. With 5 guys and a full tank of fuel this prop was very doggie. When the boat was light and only me in it, it was fair in responsiveness.

  2. #2
    Member oakman's Avatar
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    Default

    It would be interesting to see more of an apples to apples comparison.

  3. #3
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    Comparison not really needed.....I spun out the hub on my Saltwater specialist II this summer (17 pitch) and had to go back to my oem back up aluminum prop......I have a 225 Yamaha on a foot raider hard top.....it gets on step but is sloppy in a swell, hole shot sucks,.....you can feel it slip. Likely more noticeable if over horsepowered (which I kind of am) or heavy. I'm glad I had that spare as I was 55 miles from home, but I hope I never have to drive that boat again with a aluminum prop.

  4. #4

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    I've run aluminum and SS props on my rigs and there is a definite performance advantage with a SS prop on higher HP engines (150 HP +). Unfortunately, there is also a significant cost increase with a SS prop and they sure are expensive! So, if performance is your objective (and don't care about $$$), then SS is the way to go, no doubt about it. On my lower HP engines the performance advantage of a SS prop is far less apparent. As usual, YMMV!

  5. #5
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    I think stainless is worth the additional cost over time when running in the salt. I'm curious if anyone is running 4 blade over 3 blade, I don't mind losing a little high end speed if I can pick up some mid range efficiency since that is where I spend most of my time running.
    "Now you know, and knowing is half the battle." - G.I. Joe

  6. #6
    Member akdeweyj's Avatar
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    Quote Originally Posted by Patsfan54 View Post
    I think stainless is worth the additional cost over time when running in the salt. I'm curious if anyone is running 4 blade over 3 blade, I don't mind losing a little high end speed if I can pick up some mid range efficiency since that is where I spend most of my time running.
    WFO is fun on the couple of trips out of the year the water is flat enough for it, but mid range running the other 95% of the time is why I went from 3 to 4 blade SS props on my Suzukis. My boat came with 15"x 21p 3 blade SS props that were great for speed they just didn't like to cruise under 4k rpm especially running against the tides. I saved the 3 blades for spares & bought 15.25" x 21p 4 blade SS props that cost me a couple hundred rpm but they work great @ 3800-4200 rpm cruising.
    2007 24ft NorthRiver OS
    Twin 175 Suzuki's
    "Thunderbird"
    MMSI #338033856

  7. #7

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    Quote Originally Posted by akdeweyj View Post
    WFO is fun on the couple of trips out of the year the water is flat enough for it, but mid range running the other 95% of the time is why I went from 3 to 4 blade SS props on my Suzukis. My boat came with 15"x 21p 3 blade SS props that were great for speed they just didn't like to cruise under 4k rpm especially running against the tides. I saved the 3 blades for spares & bought 15.25" x 21p 4 blade SS props that cost me a couple hundred rpm but they work great @ 3800-4200 rpm cruising.
    The 13 pitch aluminum that came with my 115 allowed lots of noise but little forward motion. Replaced it with a 3 blade Stainless Solas New Saturn. Testing on Big Lake just before freeze up got a great hole shot and 40 mph wot. I'd gladly trade that last 5 mph for the suggested better mid range performance of a 4 lobe prop. I had planned to get that done and try out the Homer king thing this winter, but both my boats got vandalized so I'll get it done next spring when I get it all put back together.

  8. #8
    Member theultrarider's Avatar
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    I tried several different props when I first bought my 150 Yammi. Hands down the Yammi brand saltwater series ss prop is the clear performer for running the saltwater here. So much better low end control and response as well as fuel milage.

  9. #9
    Member akdeweyj's Avatar
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    Quote Originally Posted by theultrarider View Post
    I tried several different props when I first bought my 150 Yammi. Hands down the Yammi brand saltwater series ss prop is the clear performer for running the saltwater here. So much better low end control and response as well as fuel milage.
    You might be able to save a few bucks on props if you can find out who makes them for Yamaha & buy them from the mfr. I saved about $200 per prop by not buying the props with Suzuki's name on them.
    2007 24ft NorthRiver OS
    Twin 175 Suzuki's
    "Thunderbird"
    MMSI #338033856

  10. #10
    Member DRIFTER_016's Avatar
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    I have a few different props for my 115.
    I have a pair of 14.25" X 17" 3 lobes, I also have a 14" X 17" 4 lobe that are aluminium and I have a stainless 5 lobe that I'm still trying to get the tuning right on. It is a double cupped prop and it was a few hundred RPM low at WOT so I had a prop shop take out one of the cups but it was too much. Going to have to have it recupped again to put in about 1/2 the original cupping.


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