“The Pivot” with sterndrives

Discussion in 'General Discussion' started by Presentation, May 21, 2008.

  1. Presentation

    Presentation Well-Known Member TECHNICAL Contributor

    Oct 3, 2006
    Wisconsin - Winnebago Pool chain of lakes
    280 Sundancer, Westerbeke MPV generator
    twin 5.0's w/BIII drives
    Boat handling basics “The Pivot” part I of II

    This is a demonstration video I made to show how to pivot away from a dock with a boat that has twin sterndrives. This video shows the pivot point to be very close to the stern or back of the boat. This means you should swing the bow, not the stern, to make a pivot with a boat that has twin sterndrives. This is done single handed meaning one person with no assistance.

    Of course you can also simply back away from the dock by turning the wheel however this topic is to focus on doing a ‘pivot’

    Video 1 off 2

    http://www.youtube.com/watch?v=8GbDqzRmZqc
     
  2. chuck1

    chuck1 Super Moderator TECHNICAL Contributor PLATINUM Sponsor

    Oct 3, 2006
    North GA Mountains
    Looking For Next One
    Looking For Next One
    Interesting:huh:
     
  3. Pakmule

    Pakmule Member

    674
    Mar 18, 2007
    St. Albans, VT
    310 Sundancer 2000
    350 Mercruiser w/V-Drives
    You realize this means war...


    Not with me of course.
     
  4. Pakmule

    Pakmule Member

    674
    Mar 18, 2007
    St. Albans, VT
    310 Sundancer 2000
    350 Mercruiser w/V-Drives
    oh and nice pants
     
  5. Presentation

    Presentation Well-Known Member TECHNICAL Contributor

    Oct 3, 2006
    Wisconsin - Winnebago Pool chain of lakes
    280 Sundancer, Westerbeke MPV generator
    twin 5.0's w/BIII drives

    LOL

    The second video is still uploading. YouTube is very slow!
     
  6. JV II

    JV II Active Member SILVER Sponsor

    Nov 17, 2007
    Newport, RI
    2016 50 Fly
    Volvo Penta D11
    That's pretty much what my boat does. The stern swings a little in the opposite direction of the bow.
     
  7. teekster

    teekster Member

    326
    Oct 5, 2006
    Minnetrista, MN
    340 Sundancer, 2005
    8.1L V-drives
    I hope the music isn't as awful in part II.
     
  8. JV II

    JV II Active Member SILVER Sponsor

    Nov 17, 2007
    Newport, RI
    2016 50 Fly
    Volvo Penta D11
    Clearly a hoax. You can tell the video is doctored up. You had a car on the other side pulling the bow with 100# test mono.
     
  9. Presentation

    Presentation Well-Known Member TECHNICAL Contributor

    Oct 3, 2006
    Wisconsin - Winnebago Pool chain of lakes
    280 Sundancer, Westerbeke MPV generator
    twin 5.0's w/BIII drives
    Best keep your speakers turned down for the first 2/3rds of part II, its the same song.

    The last 1/3rd I think you will like. Its “Always look on the bright side of life.”
     
  10. Presentation

    Presentation Well-Known Member TECHNICAL Contributor

    Oct 3, 2006
    Wisconsin - Winnebago Pool chain of lakes
    280 Sundancer, Westerbeke MPV generator
    twin 5.0's w/BIII drives
    Close. I used a helicopter and 1,000 lb test fishing line. (joke)
     
  11. Presentation

    Presentation Well-Known Member TECHNICAL Contributor

    Oct 3, 2006
    Wisconsin - Winnebago Pool chain of lakes
    280 Sundancer, Westerbeke MPV generator
    twin 5.0's w/BIII drives
    Last edited: May 22, 2008
  12. Sundancer

    Sundancer Active Member

    Jul 20, 2005
    Prosser, WA
    30 year old CLASSIC 300 DA, towed almost anywhere behind the Duramax Duallie Crew Cab.
    16 cyl, 700 cu. in./Alpha I's
    Great video's! I'll have to try throwing a "ling" at the dock next time I try the "povit" manuever! When you were out in the middle spinning it almost looked like your pivot point was near the helm. Of course, that can be altered with applications of throttle one way or another I guess. Still, it seems like it was about where you were standing.

    I watched a guy lasso a cleat and thought that was a skill I could really use! I just need to figure out where the lasso's are at West Marine??

    I haven't heard the second song in years! I'm whistling it as I speak and I might have to chime in on the "What song are you listening to right now" thread!

    It would have been interesting to see you hit the port engine in forward to pivot off the starboard bow to move away from the dock. I think I'll try that this weekend with someone holding some fenders for me!

    Thanks for both, but we ALL know it was just an excuse to get away from work without the family to go boating. :smt043
     
    Last edited: May 22, 2008
  13. jg300da

    jg300da New Member

    Oct 9, 2006
    None
    Your
    Business
    Nice work Doug but an awful lot of effort to disprove 1 persons opinion. Nothing here any twin stern drive owner didn't already know. Oh, and you might want to take those shoes off before you jump on the boat...jus sayin...
     
  14. Turtlesboat

    Turtlesboat Minister of Media TECHNICAL Contributor GOLD Sponsor

    Feb 4, 2007
    New York City
    1996 450DA, TNT, Caribe dink w/15hp OB.
    3126 427HP TD transmissions
    If you practice the Chad School of docking, you don't dock your boat that way. I use one engine and it's either going forward or reverse, not both. So the boat is either going forward or reverse. If the boat is going forward, the pivot point is 1/3 from the bow. If the boat is going in reverse, the pivot point is 1/3 from the stern. If you use the "spin" method, you can see that you move the pivot point way back with very little leverage. Try doing that maneuver in wind or current and you'll end up on the beach.

    If you noticed in your video, when you got the boat moving forward approaching the dock, the pivot point of the boat was 1/3 from the bow.
     
  15. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 8212, 741 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    I don't disagree with that, IN SOME BOATS, particularly with closely-spaced I/O's.

    In other boats, (many, many other boats) "spinning" is highly effective.

    We need to remember that different boats handle differently.

    Doug set out to prove the point about twin B3 pivot point, and he did so with style.
     
  16. JV II

    JV II Active Member SILVER Sponsor

    Nov 17, 2007
    Newport, RI
    2016 50 Fly
    Volvo Penta D11
    Who's Chad? If you had two arms why would you tie one behind your back? If you used one engine on a twin I/O it definitely would not go straight forward or reverse unlesss you had the drive turned right or left, and even then, it would be very hard to go in a line with wind and current.
     
    Last edited: May 22, 2008
  17. Turtlesboat

    Turtlesboat Minister of Media TECHNICAL Contributor GOLD Sponsor

    Feb 4, 2007
    New York City
    1996 450DA, TNT, Caribe dink w/15hp OB.
    3126 427HP TD transmissions
    Yes, the problem with spinning is that it is completely boat dependent. So what works in one boat may or may not work in another boat. But if you use a boats natural pivot points, it works in all boats. You can jump from a 10' to a 40' and it will react the same way. This is why every instructor i've seen teaches a twin stern drive boater to operate the boat like a single screw boat.
     
  18. Turtlesboat

    Turtlesboat Minister of Media TECHNICAL Contributor GOLD Sponsor

    Feb 4, 2007
    New York City
    1996 450DA, TNT, Caribe dink w/15hp OB.
    3126 427HP TD transmissions
    leverage is why. If you crank the wheel over and put the outside engine in gear, you have significantly more leverage on the boats pivot point. the more leverage, the more control.
     
  19. JV II

    JV II Active Member SILVER Sponsor

    Nov 17, 2007
    Newport, RI
    2016 50 Fly
    Volvo Penta D11
    Wouldn't there then be a lot more activity at the helm with wheel turning in addition to throttle switching and more rapid angular motion of the boat to control and correct? I think with more activity required, controls involved, and the more rapid movement of the boat, there is increased chance of error. Using the throttles alone is so easy to back into the slip now that I have learned how to compensate for the wind and current. I've tried using the wheel too and it creates confusion and errors. I've got about a foot on each side of my boat. Now, moving laterally off of a dock is a different story.
     
  20. Turtlesboat

    Turtlesboat Minister of Media TECHNICAL Contributor GOLD Sponsor

    Feb 4, 2007
    New York City
    1996 450DA, TNT, Caribe dink w/15hp OB.
    3126 427HP TD transmissions
    No more activity than driving a car.

    I think it's much more confusing to switch from the natural pivot point of a boat moving through the water, to the un-natural one at the dock using the forward reverse spin. by maximizing leverage and using the boats natural pivot points, every move is predictable, controlled, and repeatable on any boat.
     

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