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  1. #21
    Join Date
    Aug 2013
    Posts
    22

    Default

    Maybe i'm trying to make the boat do something it isn't designed to do, i'm going to adjust the trim and see what happens. I'm sure that it being 23ft instead of 21ft also makes a difference on turning radius.

    Thanks for the input everyone.
    2005 XLV Gravity Games Edition

  2. #22
    Join Date
    Mar 2010
    Location
    Arkansas
    Posts
    2,524

    Default

    I'd still add weight to the back of the boat so the prop is deeper in the water.

    If you are trying to throw people off the tube, look for some pulling techniques instead of speed.
    2006 Supra 24SSV

  3. #23
    Join Date
    Aug 2013
    Posts
    22

    Default

    Quote Originally Posted by KG's Supra24 View Post
    I'd still add weight to the back of the boat so the prop is deeper in the water.

    If you are trying to throw people off the tube, look for some pulling techniques instead of speed.
    Yeah, really the only time I encounter that is when i'm purposely pulling a tube to another place on the lake and needing to go faster, other than that, i usually go slower and whip them out.
    2005 XLV Gravity Games Edition

  4. #24
    Join Date
    Nov 2013
    Posts
    174

    Default

    Definitely sounds like prop cavitation to me. When you load a prop wrong or too much they tend to do that. Essentially drops the pressure on the back side so much the water boils, creating pocket of air. Pretty cool physics behind it.
    2007 LSV

  5. #25
    Join Date
    May 2010
    Location
    Salt Lake City, Utah
    Posts
    395

    Default

    definitely sounds like cavitation to me. My need to look at your prop and make sure you don't have any damage to it or you may need to upgrade it if you are running a stock prop.
    Scott
    2007 Mobius LSV with a lot of great upgrades and mods

  6. #26
    Join Date
    Jul 2013
    Location
    North Mississippi
    Posts
    175

    Default

    A few things to consider when pulling the dreaded tube. First of all I hope you don't have it hooked to the the tower, way too much load and could damage things. Second of all, if you have it hooked to the ski pylon like most everyone, that's still elevated enough that when you make a sharp turn the drag from the tube will actually pull (roll) the boat over more thus exposing your prop to a greater chance of cavitation.
    Also, as far as tube pulling technique. When you pull from the ski pylon, it's a lot more difficult to whip the tube around because when you turn, the boat is almost pivoting around the pylon (just forward of it) and you lose that tail whipping movement that most of us are used to on conventional ski boats. If you have a transom attach point, you may try hooking a tube there, but your riders will have to deal with more spray generated from rope splash.
    2008 Mobius LSV
    1100#er's in the lockers
    ski locker sac
    IBS
    Johnson reversibles
    3 vent heater (which my family loves)

  7. #27
    Join Date
    Mar 2012
    Location
    Spring, Texas
    Posts
    87

    Default Has anyone else had this happen?

    Quote Originally Posted by ninedriver View Post
    A few things to consider when pulling the dreaded tube. First of all I hope you don't have it hooked to the the tower, way too much load and could damage things. Second of all, if you have it hooked to the ski pylon like most everyone, that's still elevated enough that when you make a sharp turn the drag from the tube will actually pull (roll) the boat over more thus exposing your prop to a greater chance of cavitation.
    Also, as far as tube pulling technique. When you pull from the ski pylon, it's a lot more difficult to whip the tube around because when you turn, the boat is almost pivoting around the pylon (just forward of it) and you lose that tail whipping movement that most of us are used to on conventional ski boats. If you have a transom attach point, you may try hooking a tube there, but your riders will have to deal with more spray generated from rope splash.
    How does pulling a tube from the tower cause any more strain than pulling a wakeboarder who is cutting in the water?
    2007 Supra 20SSV - 325HP

    Wetsounds Rev 10's
    XS-650's
    Syn 6
    Syn 4
    WS-420

  8. #28
    Join Date
    Jun 2012
    Location
    Portland Oregon
    Posts
    825

    Default Has anyone else had this happen?

    Quote Originally Posted by kevkev View Post
    How does pulling a tube from the tower cause any more strain than pulling a wakeboarder who is cutting in the water?
    There is no way a rider can submerge and create enough drag to practically stop your moving boat.
    While it rarely happens given the "perfect storm" should a wave hit your tube just right and take it under while you are more focused on fallen riders than the tube the amount of drag that thing creates is an attention getter! That is when towers get damaged. And you can pull a tube for years without ever submerging it but that one time it happens you will be glad you didn't attach it to your tower.
    -Jake

  9. #29
    Join Date
    Nov 2010
    Location
    Katy, TX
    Posts
    4,215

    Default

    Quote Originally Posted by kevkev View Post
    How does pulling a tube from the tower cause any more strain than pulling a wakeboarder who is cutting in the water?

    I've often wondered this myself. If you wake board with a pretty big wakeboarder who knows how to build a good progressive edge and a lot of line tension it can roll the boat over too. Happens all the time on our boat, I can't see pulling a tuber applying any more stress than a 200 lb+ man edging hard...
    David

    2008 Mobius LSV, Gravity III , Wake Plate, Z5, Exile SX65c's, Exile XM9s, Exile XI12D, Exile Harpoon, Exile SM600.1 , Exile Xi800.4.

  10. #30
    Join Date
    Jun 2009
    Location
    South West Colorado
    Posts
    361

    Default Has anyone else had this happen?

    Like jake said, if that tube gets under the water, that pressure far exceeds a big wakeboarder. That tube won't let go of the rope either.
    '08 Mobius LSV, Mods- 1100 lb Rear Sacs, IBS Sac, Center 400 Sac, Dedicated thru-hull intakes and pumps per sac, SeaDek One Piece Mica over Black Roo, EZ Net Cargo Nets, Swivel Drivers Seat, Hot Water Shower, Hinged Wind Block, Bow Cushion Adapter Plate for Drink Holders Access, etc, etc.

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