Vector Out of Control

Hi Randy: 

I have a Vector 78 with a Merc. 150 EFI, stock lower unit about 3 inches below the pad, 6 inches of set back, manual jack plate, 26 laser prop., the fuel tank is plastic 18 gallon in the back of the boat, battery in the middle of the boat. Top RPM 5,100 boat runs about 60 miles/hour on the GPS. At that speed it wants to get out of the water, I think still porpoising, very difficult to control. This happens with the motor at neutral position. No chine walk. What can I do to solve this problem and make the boat go faster?

Thank you. I think your column is great.




The boat sounds like it's trying to get up on the wedge (hook in the pad). You need to trim out more and go slowly at this, as I would expect 10 plus mph and 8-900 rpm more as the boat frees up. Run a foot throttle and dual steering, (adjusted for no play) and work your way up. The bow should carry and not push back if you run a little more trim. The boat will get loose, so just throttle to where you are comfortable. The rest will come. 




Please submit whatever questions you have to  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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