slalom ski prop, bravo 1, 496 MAG
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slalom ski prop, bravo 1, 496 MAG

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    Thumbs up slalom ski prop, bravo 1, 496 MAG

    I have a 21 foot shockwave with a bravo 1, 496 MAG, and a 24 p 4 blade on it. Great for top speed and cruising around but it is a dog on pulling up a skier. I ran jet boats for most of my life so please excuse my prop ignorance. I was told an 18 pitch prop with my set up would yank a skier out of the water with purpose. Any insight? 18p 4 blade? or what would you run for a ski prop with my set up? Thanks!!!
    Sweet boat with a matching sexy wife = life is good here!!!
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    Quote Originally Posted by One More Year View Post
    I have a 21 foot shockwave with a bravo 1, 496 MAG, and a 24 p 4 blade on it. Great for top speed and cruising around but it is a dog on pulling up a skier. I ran jet boats for most of my life so please excuse my prop ignorance. I was told an 18 pitch prop with my set up would yank a skier out of the water with purpose. Any insight? 18p 4 blade? or what would you run for a ski prop with my set up? Thanks!!!
    Sweet boat with a matching sexy wife = life is good here!!!

    Mercury makes a Revolution 4 prop

    They make them in 15" 17"19" 21" 23" 25" pitch

    BBlades Propellers | Prop Slip Calculator
    Last edited by BigSteve; 07-16-2014 at 02:56 PM.
    If you ain't the lead dog the view is always the same !

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    Quote Originally Posted by BigSteve View Post
    Mercury makes a Revolution 4 prop

    They make them in 15" 17"19" 21" 23" 25" pitch
    What is special about the revolution 4? And for a ski prop with my set up (not pulling too many little people, mostly fat guys like myself!) what pitch would be the most effective? As low as a 15 or is that too much? Thanks!

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    Quote Originally Posted by One More Year View Post
    What is special about the revolution 4? And for a ski prop with my set up (not pulling too many little people, mostly fat guys like myself!) what pitch would be the most effective? As low as a 15 or is that too much? Thanks!
    I posted up a link to BBlades prop slip calculator

    Most Bravo drives have a 1.5 gear ratio

    A 17 pitch w 1.5 gear @ 3800 rpm Approx 15% slip is 34 mph
    Your slip may be higher than that if the boat is trimmed down to really track
    Should work great for skiing and pulling tubes with a loaded boat

    A 15 pitch will really get it on.
    We are going to use one for barefooting on our 22 Daytona w / Merc 300 xs
    1.62 gear we should run 39 mph @ approx 5000 rpm


    Last edited by BigSteve; 07-16-2014 at 03:18 PM.
    If you ain't the lead dog the view is always the same !

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    Quote Originally Posted by One More Year View Post
    What is special about the revolution 4? And for a ski prop with my set up (not pulling too many little people, mostly fat guys like myself!) what pitch would be the most effective? As low as a 15 or is that too much? Thanks!
    A question about your boats exhaust system

    Do you exit out the prop ? or have thru transom exhaust system ?

    It makes a difference in how a prop bites
    If you ain't the lead dog the view is always the same !

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    Quote Originally Posted by BigSteve View Post
    A question about your boats exhaust system

    Do you exit out the prop ? or have thru transom exhaust system ?

    It makes a difference in how a prop bites
    Through transom. I think I understand the prop calculator. More slip = more drag which is top end loss, but the lower pitches are gonna give you the bottom end correct? For the equation I am looking for (best ski prop/traction for my set up) what exactly am I looking for in the prop calculator? I put in 18p, 1.5 gear, 25 mph (roughly ski speed) and it shows a slip of 12%.But a 19 pitch goes up to 16.63%? Lost me there, higher pitch but more drag? The price I pay for growing up on jets lol! But thanks for the help here

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    Quote Originally Posted by One More Year View Post
    Through transom. I think I understand the prop calculator. More slip = more drag which is top end loss, but the lower pitches are gonna give you the bottom end correct? For the equation I am looking for (best ski prop/traction for my set up) what exactly am I looking for in the prop calculator? I put in 18p, 1.5 gear, 25 mph (roughly ski speed) and it shows a slip of 12%.But a 19 pitch goes up to 16.63%? Lost me there, higher pitch but more drag? The price I pay for growing up on jets lol! But thanks for the help here
    Most water skiing for men is 30-34 mph range 36 for pro
    Wakeboarding 21-24 mph is in the range

    I would use a 15 to 17 pitch for skiing

    The prop slip calculator is a tool you can use to chart a props true performance
    Important things like a accurate tachometer ( use digital readout rpm #)
    and a GPS . Note the RPM vs Speed make a graph.

    Then you can plug the #s into the Slip Calculator
    i.e. Prop pitch , gear ratio , rpm, gps and it will tell you slip #
    Do it for best trim setting for speed and re test for best trim set up for skiing


    Knowing your Slip # allows you to back figure the #s

    Your boat should be running 12 to 15 % slip, trimmed for best speed with that Bravo prop

    A lower pitch will hook up much better at lower speeds, a higher pitch won't and will really slip, burn and grap. Thats not good on lower ends

    Having a baseline set of #s can really help a prop shop dial it in
    If you ain't the lead dog the view is always the same !

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    Thanks Big Steve! Hoping to go to the prop shop before next havasu trip on the 25th!

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    Quote Originally Posted by BigSteve View Post
    I posted up a link to BBlades prop slip calculator

    Most Bravo drives have a 1.5 gear ratio

    A 17 pitch w 1.5 gear @ 3800 rpm Approx 15% slip is 34 mph
    Your slip may be higher than that if the boat is trimmed down to really track
    Should work great for skiing and pulling tubes with a loaded boat

    A 15 pitch will really get it on.
    We are going to use one for barefooting on our 22 Daytona w / Merc 300 xs
    1.62 gear we should run 39 mph @ approx 5000 rpm


    I missed this post. Wow 39 mph @ 5,000 rpm!!!! Now that's gonna pull a fat guy out of the water!!!

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    Quote Originally Posted by BigSteve View Post
    Mercury makes a Revolution 4 prop

    They make them in 15" 17"19" 21" 23" 25" pitch

    BBlades Propellers | Prop Slip Calculator
    Big Steve am I running a rev 4? Inland Marine did put a sweet prop on it when I bought it last year!
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    Quote Originally Posted by One More Year View Post
    Big Steve am I running a rev 4? Inland Marine did put a sweet prop on it when I bought it last year!
    The prop in the pic 48-831912 is a Mercury Bravo 4 blade 24 pitch 15 1/4 dia.
    Good overall prop

    The Rev 4 comes in odd pitches and is a little smaller in dia

    BBlades is great to work with and they have lots of experience.
    They stock several of the best mfg line of props and their own.

    I would give them a call, you might work a deal to test a couple !

    I run a custom BBlades prop most of time.
    Last edited by BigSteve; 07-16-2014 at 07:18 PM.
    If you ain't the lead dog the view is always the same !

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    Your prop is essentially your tire-size OR your gearing. What you gain on the bottom, you lose on the top / / what you gain on the top, you lose on the bottom.

    PITCH equals, ONE COMPLETE ROTATION - - with NO SLIP - - the prop would travel XX" So, if there was no slip factor, a 24" pitch prop would travel 24 inches in one full revolution.

    You will want to take your turbulators out. Copy/paste that word into the FORUM SEARCH box.

    The reason a Revolution prop was mentioned is - - BRAVO-1 props stop at 22P. I have a 22P B1, 24P B1 and 26P B1. If you want lower as a "SKI" prop, you will want to STAY with a 4-blade but get down to a 17 or 19P. So, an off-the-shelf offering, easy to get would be a Rev-4.

    I started with 24P and could spin it to 4800 or so (425hp 496HO). Took turbulators out, drained all fluids and replaced with synthetics, and now I am hitting the rev limiter (5150) with 24P, so I got a 26 for those lighter / cooler days. I keep the 22P as a "13 people, 3 ice chests, 116-degree-ambient" prop.
    Last edited by Beer:30; 07-16-2014 at 08:00 PM.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    I have heard take the turbulators out a few times on these forums. I think I'll give it a try especially since a good friend of mine is rebuilding the 454 in his Cole with the idea of taking the trophy back from me! (though it's gonna be hard to beat a set up cole with a stock shockwave lol!) Thanks for all the prop info guys! I know enough to be dangerous and now it is time to start swapping props to get what I am looking for.

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    Quote Originally Posted by One More Year View Post
    I have heard take the turbulators out a few times on these forums. I think I'll give it a try especially since a good friend of mine is rebuilding the 454 in his Cole with the idea of taking the trophy back from me! (though it's gonna be hard to beat a set up cole with a stock shockwave lol!) Thanks for all the prop info guys! I know enough to be dangerous and now it is time to start swapping props to get what I am looking for.
    You really can't do any harm, as long as you put the hub, nut, and lock ring back exactly as they were before.

    All of the props should be no problem - - as long as you stay with the SAME ROTATION (LH or RH)
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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