Bow thrusters using PTO water pump?

Discussion in 'Surface Drives' started by parkland, Oct 29, 2012.

  1. parkland
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    parkland Senior Member

    I have been doing some reading about bow thrusters, and also noticed some designs where people used electric trolling motors and such as bow thrusters on pontoon boats or houseboats.
    What about using a water pump, and piping to direct the flow of water?

    Some pumps can be PTO or belt driven, or run on a seperate engine. OR electric motor.
    It seems like a really good idea.

    Has this been done before?
    It seems like it would be so easy to do, and cheap.
    It could also act as a backup propulsion system in an emergency.

    Why not a bow and stern thruster?
     

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  2. dougfrolich
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    dougfrolich Senior Member

  3. parkland
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    parkland Senior Member


    I did run across that,
    I was thinking more along the lines of houseboat and pontoon boat use.

    A system could be made with an inexpensive water pump, and the plumbing could be PVC pipe, and the nozzles could be made to turn, very cheap and easily.
     
  4. keysdisease
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    keysdisease Senior Member

    Egret Boats made a 29 with PTO driven water jet thrusters. It was a short lived production run and I never had any first hand knowledge of how well it worked. I did think it was a great idea.

    I would think one of the drawbacks would be that the PTO driven pump would operate at low volume (thrust) at idle speeds typically used in docking. Mixing up forward at low RPM, neutral with throttle for thrusters, and reverse at low RPM would be a handful during docking.

    :cool:
     
  5. michael pierzga
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    michael pierzga Senior Member

    I sailed a boat...90 footer...with a waterjet bow thruster. Not. good.

    Very large and complex plumbing, huge pump, gigantic sea strainer and frequentl clogging, modest thrust power.

    On a small boat go electric. On a large boat go hydraulic PTO.
     

  6. FAST FRED
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    FAST FRED Senior Member

    Mount a 20-50 hp outboard on the bow , facing sideways , use the biggest prop you can find.

    Thrust takes power , big thrust takes big power.

    Consider it a get home engine too.
     
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