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  1. #1

    MPH difference in salt water vs fresh water

    Anyone know if there is a significant differnence? I used to live in West Palm Beach, Florida (Plenty of salt water), and now live in Ohio. I run on Lake Erie. My ski does the same as it did in Florida. Came across a guy on the lake w/ a GPR like mine and he claims his ski is slower here than what it was where he lived in Tampa, Florida.


  2. #2
    From what I've heard, fresh water is a little faster than salt water. (i've never ridden in saltwater though.)

    However its normal for people I see on the water to say their ski was alot faster yesterday, somewhere else, before this tank of gas, ect.

  3. #3
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    fresh is about a half mph. faster and about 50 rpm's more.

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    Duke's Avatar
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    Quote Originally Posted by jims 1300 View Post
    fresh is about a half mph. faster and about 50 rpm's more.
    Thats been my experience too. No explanation though.

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    Hydrotherapy's Avatar
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    Quote Originally Posted by Duke View Post
    Thats been my experience too. No explanation though.
    salt makes water denser..or so i thought

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    quadzilla's Avatar
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    ?????????

    Interesting..

    From my experience, particularly with my GP1200.

    I've always felt the ski was much more buoyant in the salty stuff..!!

    (NOT the one you sicko's are thinking about now... the SEA)

    Althrough that might not help/effect topend any..

    Gerry

  7. #7
    Hydrotherapy's Avatar
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    Quote Originally Posted by quadzilla View Post
    Interesting..

    From my experience, particularly with my GP1200.

    I've always felt the ski was much more buoyant in the salty stuff..!!

    (NOT the one you sicko's are thinking about now... the SEA)

    Althrough that might not help/effect topend any..

    Gerry
    it will be due to the volume of salt with gives the water bouyancy/densety,

  8. #8
    way2fast's Avatar
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    This topic has been discussed before. Ask any off shore racer what water is "faster" and most will say salt is faster. The salt makes the water slightly heavier and any object immersed in it lighter. (Law of Buoyancy) A lighter load will plane faster and run quicker on the top end. The speed increase is dependent on the type of hull. Those that displace more water will benefit the most. A lightweight tunnel or hydroplane uses air to achieve lift so the difference is negligible. It can be argued that the denser, heavier salt water takes more hp to turn the prop. This is offset by the prop getting a better bite and less chance for cavitation or ventilation.


    Richard

  9. #9
    sleeplessnMS's Avatar
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    I think alot plays a part in this salt VS fresh...
    water temp
    air temp
    humidity
    wind

    I have never set any speed records in fresh though thats for sure! I run in brackish water so I guess it splits the difference I have ridden in lakes just 200 miles north of me and my ski's were both slower but it was HOT as hell there! Another thing is that salt water mostly has a tide moving. This can result in .5-1.3 mph gain with the tide depending so ya have to run both ways and split that to really get a true mph. Sumtimes we catch it still and the gps shows consistant speed.

  10. #10
    HopatcongGPR's Avatar
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    i have always seen salt as faster.

    the hull rides up higher in the water due to the added buoyancy allowing for less wetted surface.

    then again,,,i ride at 1000 feet up...have yet to ride at a lake at 0' altitude to compare apples to apples with the bay...

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