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Thread: 115 vs. 90

  1. #21
    Join Date
    Jan 2012
    Posts
    827

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    Lady GT

    if you go to the home page of PDB, top right at search... input TAP Fins
    That info might help .
    Malcolm ( Goofy )
    TAP Fins
    8525 Sylvan
    200 H O E Tec




    " Keep a fire in your heart and a smile on your face, for you never know when your leaving this place"

  2. #22
    Join Date
    Jun 2004
    Posts
    6,222

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    Quote Originally Posted by WaterLogged View Post
    I don't know what the 90hp would do, but my 115hp easily lifts my 22' boat up on the strakes and it will run at 30mph. I am running a 13.75 by 15 prop at about 250' elevation. The elevation you run at will effect needed prop pitch, I need a longer prop because I sometime exceed max rpm.

    Glenn
    Glenn, do you have the 26" logs and the NV Performance strakes?
    Rick

    St. Louis/Lake of the Ozarks

  3. #23
    Join Date
    Apr 2008
    Location
    Calif Central Coast
    Posts
    201

    Default

    Yes, yes I do! They work out just great for my purposes.

    Glenn
    2008 SunTracker Regency Party Barge 22
    2008 Mercury 115hp 4stroke

  4. #24
    Join Date
    Jul 2006
    Location
    Raystown Country, PA
    Posts
    2,252

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    The NV strakes were one of the best performance features I ever saw. The side by side, one with, one without videos they put out were the best sales tool ever. I always wondered why Tracker stopped them after only a few years.
    2006 Forester 19 Fish (new deck and carpet, Pontoonstuff interior, 2019)
    1996 Mercury 50 ELPT4S
    1983 Sea Nymph FM171 Striper (complete rebuild from hull up, 2014)
    1985 Johnson 70 J70ELCO

    Raystown Country, PA

  5. #25

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    Not to get too technical here, but the dealer who told you there is no difference was wrong. Generally speaking, power requirement goes up with the cube of speed. So conversely, speed increases by the cube root of the power ratio. A 115 will probably yield about 9% more speed, or maybe 3 mph.
    =============
    Walter
    Harris Flotebote Sunliner
    Amite River Diversion
    Head of Island, LA

  6. #26
    Join Date
    Jan 2012
    Posts
    827

    Default

    Well for years on here we see the talk.
    Now lets show the issue ...

    Side Flow Resistance , Velocity off the flow force is applied.
    When there was a 40 HP not much flow force coming from it. ( More talk than fact )
    Look where we are NOW.... ! 2021!!!
    T.A.P. Fins just got there 1st.
    90\ 115, 150 or 600 HP side Flow Force is there.
    Attached Thumbnails 000_0004.jpg   Here is what controls Flow Force   Control that side Power. T.A.P. Fins do 2021.jpg   Side by Side see what sticks out on Performance T.A.P.fins for the Luxury Performance Enhancemen.jpg   This explains the under deck pounding you feel T.A.P. Fins redirect flow force  you get lift.jpg   Side by side  Peole relate to the reason    self selling your Luxury Performance Enhancement Edi.jpg  

    Malcolm ( Goofy )
    TAP Fins
    8525 Sylvan
    200 H O E Tec




    " Keep a fire in your heart and a smile on your face, for you never know when your leaving this place"

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