Prop 101
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Prop 101

  1. #1
    Member Spectratoad's Avatar
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    Default Prop 101

    Is there a Props for Dummies book anywhere? I need to figure our what prop to run now that I think I have the rest of the mechanic stuff running smooth. Reading some of the other threads on here I am guessing that I need to go down to at least a 23? Also I am wondering what may work better, a 3 or 4 blade?

    My issue. Old motor kept coming apart and had a supercharger on it. Was a 502. New motor is carbureted 454 30 over no super charger. Bravo 1 outdrive. Yesterday I could only get it to top out a 3-3,400 rpm, slow to get on plane. I had my 4 blade 26 pitch prop. I am wonder with the technically smaller motor is that too much prop?

    I have a 23 pitch, 3 blade I am going to try but looking for general prop info before I start tinkering too much or buying props that won't fix the problem.

    Is the bigger number for the pitch mean that it is more of an angle and therefore pushing more water?

    Thanks for any info
    Last edited by Spectratoad; 06-16-2014 at 05:35 AM.
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  3. #2
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    Don't know of a book; more info would help people guess at solutions to your problem

    Quote Originally Posted by Spectratoad View Post
    Is there a Props for Dummies book anywhere? I need to figure our what prop to run now that I think I have the rest of the mechanic stuff running smooth. Reading some of the other threads on here I am guessing that I need to go down to at least a 23? Also I am wondering what may work better, a 3 or 4 blade??

    What is the boat?

    My issue. Old motor kept coming apart and had a supercharger on it. Was a 502. New motor is carbureted 454 30 over no super charger. Bravo 1 outdrive. Yesterday I could only get it to top out a 3-3,400 rpm, slow to get on plane. I had my 4 blade 26 pitch prop. I am wonder with the technically smaller motor is that too much prop?

    What gear ratio?

    I have a 23 pitch, 3 blade I am going to try but looking for general prop info before I start tinkering too much or buying props that won't fix the problem.

    Good idea.

    Is the bigger number for the pitch mean that it is more of an angle and therefore pushing more water?

    Yes.

    Thanks for any info

  4. #3
    Member Spectratoad's Avatar
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    Carrera Classic 23.5 and a 1.50:1 ratio. Pretty sure I need to put the smaller prop on now but looking for insight from those more knowledgeable in props.

    Thank you for being the first of the 90 views to reply and let me know I needed to provide more info.
    Never hold discussions with the monkey when the organ grinder is in the room. http://www.hotboatpics.com/pics/data/500/2092Mustang_22.JPG

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  6. #4
    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by Spectratoad View Post
    Carrera Classic 23.5 and a 1.50:1 ratio. Pretty sure I need to put the smaller prop on now but looking for insight from those more knowledgeable in props.

    Thank you for being the first of the 90 views to reply and let me know I needed to provide more info.
    I see your from Reno NV

    Boating at Tahoe requires a much lower pitch than at sea level.

    Mercury makes a Bravo 4 blade prop, Jako Marine sells them @ $469

    The correct prop has a lot to do with load and density altitude

    Generally, you need a couple props to cover your bases
    and always have a spare in the boat

    A 22 pitch prop w/ 1.5 gear @ 5200 rpm is 61 mph w/ 15% slip

    The lowest Bravo pitch is 22, You may or may not have the power to pull it

    I would give it a try
    Last edited by BigSteve; 06-16-2014 at 09:45 PM.
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    There is alot more to props than just pitch... but getting pitch right first is important.

  9. #7
    Member Spectratoad's Avatar
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    Thanks for the info guys. I will check out those links.

    Big Steve I don't get on Tahoe much since it is such a pain if Tahoe isn't the only lake you go to. You have to get and pay for an inspection each time to check for the mussels. But I still frequent lakes in our general altitude and the Delta.

    I will check out this info though. Thanks for more info.
    Never hold discussions with the monkey when the organ grinder is in the room. http://www.hotboatpics.com/pics/data/500/2092Mustang_22.JPG

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    Quote Originally Posted by Spectratoad View Post
    Thanks for the info guys. I will check out those links.

    Big Steve I don't get on Tahoe much since it is such a pain if Tahoe isn't the only lake you go to. You have to get and pay for an inspection each time to check for the mussels. But I still frequent lakes in our general altitude and the Delta.

    I will check out this info though. Thanks for more info.
    I know most boaters don't believe in the stiletto propeller for performance but I have had great luck running. I have a wellcraft 192 classic with 351w running 25p $250.00 progressive pitch runs mid 60's. Ran a 24 clever 58 mph @ 5500 rpm , Stiletto 25p drop 1000 rpm gain 4 mph on my Regal 202se with 351w. Good whole shot 1.66 gear in the drive. Try your 23p find out where you stand and go from there. I get good fuel mpg running 4600 rpm and can run mid 60's

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