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  1. Member Largemouthlou's Avatar
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    Jun 2004
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    Palm Bch Gardens FL
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    #21

    Re: Prop Slip Calculator (202champ)

    Matt, welcome dude, no invading of space!! This is for ALL that want to be here..

    Mike is telling ya straight on the #ers, that is why he didn't tell them to ya the first time, cause they are a little different then what you are running..

    You have a great running prop/boat!!! Most 21"10 Bullets are right at the same speeds as you.. Louis

  2. Member
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    Aug 2006
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    central
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    #22

    Re: Prop Slip Calculator (Largemouthlou)

    I am going to run it again empty and pay closer attn. to the tach just to see what I can come up with. Thanks for all the information, This IS a great site !! matt m



    Matt Miller Central SC
    1996 202 CHAMPION
    2000 250 MERC XB

  3. Member
    Join Date
    May 2007
    Location
    Maui
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    3,074
    #23
    Using the calculator, here's what I'm finding....

    2002 Javelin 180
    2002 Yamaha 130 v4
    13 1/4 x 22 (I added one to make it 23 on the calculator)
    5300rpm light (low)
    53mph GPS
    2.0 gear

    Shows 10% slip.

    That about right for this rig? I think the prop needs an inch taken out, but just wanna get some other stuff clear first.

    Thanks
    "The most dangerous risk of all -the risk of spending your life not doing what you want on the bet you can buy yourself the freedom to do it later." -random Facebook pic that came up on my wall


    8'6" Longboard
    6'6" Shortboard

  4. Member Largemouthlou's Avatar
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    #24

    Re: (tnjavelin)

    Yes that is good for yours.. Most T loaded Bass Boats are between 10 and 12% slip.. Louis

  5. Member
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    #25
    Fantastic! Thanks for the quick reply. Now I can move on to motor height. Mmmmmm....
    "The most dangerous risk of all -the risk of spending your life not doing what you want on the bet you can buy yourself the freedom to do it later." -random Facebook pic that came up on my wall


    8'6" Longboard
    6'6" Shortboard

  6. Member Largemouthlou's Avatar
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    #26

    Re: (tnjavelin)

    Just watch the water pressure and temp Gage!! Especially in turns

  7. Member
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    Jun 2011
    Location
    Jackson, TN
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    59
    #27
    Question I have a 1997 Procraft dual console merc 200 efi turning 6200 rpm 1.87 gear ratio 25 pitch trophy (actually a 24 with a little cup) running 65 w/ 2 guys cooler and gear half tank gas. shows 17% slip water pressure is right at 15. How far off am from as good as i'm going to get and where should i go from here? Thanks
    J.P.
    "Fishing ain't about luck, It's how you wiggle your worm"

  8. Member Largemouthlou's Avatar
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    #28

    Re: (volsjp)

    JP, sounds like you need to try a true 25 or 26 pitch prop, need to watch your positive trim. Your slip #er should be more like 12%

  9. Member
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    Jun 2011
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    Jackson, TN
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    #29
    how much difference am i going to notice if i can go from 17-12 percent slip numbers?
    "Fishing ain't about luck, It's how you wiggle your worm"

  10. Member Largemouthlou's Avatar
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    #30

    Re: (volsjp)

    A lot of variables but I would say between 2 and 5 mph.

  11. Member
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    Jun 2011
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    Jackson, TN
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    59
    #31
    took the first step and lowered the motor 1/2 inch to see if that helps.
    "Fishing ain't about luck, It's how you wiggle your worm"

  12. Member
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    Jul 2010
    Location
    Clarksville
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    98
    #32

    Re: (Largemouthlou)

    I have a 921 phoenix with 250 pro xs im weighing about 3000lbs give or take 100lbs I am running a 26 fury 75mph turning it 5800 trying to get the most mph out of it what do I need to do thanks for any info

  13. Member
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    Jun 2015
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    PASCO COUNTY/ HUDSON, FLORIDA
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    138
    #33
    YOU CANT BETTER THAN THAT 5% YOU SURELY HAVE THE RIGHT PROP!

  14. Fishfarm (Jay) fishfarm's Avatar
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    Mar 2009
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    Kingman Arizona
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    #34
    Quote Originally Posted by Largemouthlou View Post
    I know some of you guys already use this one, but for those that don't plug in your #ers!!

    http://www.go-fast.com/Prop_Slip_Calculator.htm

    Louis
    Hey Lou I'm a Little lost with this. Can you help me out. 24p Razor XL4 at 5900 r's and 70/71 gps 1.75 gears
    2000 520vx Ranger
    250 PRO XS
    SERIAL#2B115788/ 25P Fury 4/ 25P Fury 3 blade

  15. Member Bullet Bling's Avatar
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    Kettering Ohio land of small fish
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    #35
    U got 9%
    2005 Stroker 2010-250pro xs

  16. Fishfarm (Jay) fishfarm's Avatar
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    #36
    is that good. I'm trying a Razor 3 next
    2000 520vx Ranger
    250 PRO XS
    SERIAL#2B115788/ 25P Fury 4/ 25P Fury 3 blade

  17. Member Bullet Bling's Avatar
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    Kettering Ohio land of small fish
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    #37
    Yes anything over 12 in my book there is a problem
    2005 Stroker 2010-250pro xs

  18. Member
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    Jun 2012
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    ponca city oklahoma
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    361
    #38
    Below is what I have always used to calc prop slip:

    RPM X Prop pitch =
    1056 x gear ratio =

    Example:
    6500 rpm x 28 pitch = 182,000
    1056 x 1.75 = 1848

    182,000 divided by 1848 = 98.48 mph "theoretic speed" sub track actual gps speed from theoretic speed and thats the % or efficiency loss.

  19. Member
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    Mar 2022
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    Axton, va
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    1
    #39
    So I came into this post a little late. My numbers are greatly off, as I come up with a neg number. -1.62???
    21.5 pitch
    5800 rpms
    48 mph
    2.50.1 gear ratio

  20. Member
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    Aug 2015
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    Alabama
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    207
    #40
    An update on the link in first post - it's broken. Here's a current active link: https://www.go-fast.com/Knowledge-ba...lip-calculator

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