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Jet Drive zodiac

Discussion in 'Public Safety Divers/Search and Rescue' started by firefrog, Jan 13, 2005.

  1. mike_s

    mike_s Solo Diver

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    The major reason I don't like jet-drives it that unless you are applying throttle, you have NO Steering! So if you are coming into a dock for example and you shift the throttle into neutral, there is no jet force to turn the boat to use for steering.

    I've seen this numerous times when dumb kids on Jet Ski's come into the dock and let off the throttle before the dock then try to turn and it won't turn.... and WHAM they hit the dock or another boat.

    Other disadvantages are less power, more fuel usage. Their intakes also suck up trash like garbage bags which wrap around the impeller, etc.

    The only advantage they have is lower clearance and no prop to damage.

    Only advantage I can see is that there is no prop.
     
  2. Boater Dan

    Boater Dan Barracuda

    # of Dives: 100 - 199
    Location: Western PA
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    First off, Medic 1687 did a fantastic job of explaning the differences. Good Job!

    Since most of the information has been covered, I thought I would throw out one other suggestion. Our team utilizes a Sea Doo Explorer. It is a cross between a jet ski and an inflatable. They are extremely fast and stable. A friend of mine has a personal unit which I used for recreation and I can tell you they are virtually impossible to dump or flip due to the bladder on the outside of the ski.

    We managed to pick ours up at a government surplus disposal yard. The biggest drawback (same with a jet outboard), no throttle, no steering.

    Just throwing it out as a option. Depending on just how shallow of water you are talking, the Explorer may be too heavy and deep.

    Dan
     
  3. cool_hardware52

    cool_hardware52 Dive Equipment Manufacturer

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    I'm sure this is old news to experienced Jet boaters, but it's fairly easy to control a jet powered craft at low speeds, it just requires a different technique.

    It you need to turn with the throttle "off" just turn the wheel to the maximum stop (i.e. either full port or full starboard) and "burp" the throttle. It's like steering with thrusters. It takes a little practice, and at first seems counter-intuitive, but soon becomes second nature.

    (2 or more short throttle pulses are much better than one pulse that is belatedly determined to be toooo long :D)

    You do need a responsive throttle, and motor that does not stall when repeatedly "pulsed"

    This also works pretty good for any directional prop vessel, i.e. outboard or outdrive.


    Regards,



    Tobin
     
  4. medic1657

    medic1657 Garibaldi

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    Bridgediver,
    The guys in the eastern part of VA. didn't have any ideas on controlling the weeds being pulled into the intake. They did say that if someone has a suggestion, they would be happy to try it. They have the same problems that you described.
    Medic1657
     
  5. firefrog

    firefrog Nassau Grouper

    # of Dives: 500 - 999
    Location: Lees Summit MO
    187
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    Hey thanks for all the great info about this subject . We were tossing around the Idea of getting a jet motor for our zodiac , the motor we have on it now is a 40horse Johnson and we want to keep the small motor size just for the chance that we have to carry the boat to launch it , which we have had to do . I hadnt seen the composite props before so that is something that we will be looking at for sure ..... Thanks again.............
     
  6. bridgediver

    bridgediver Instructor, Scuba

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    Yep. Common problem I'm sure. Thanks for looking into it though
     
  7. teknitroxdiver

    teknitroxdiver Solo Diver

    # of Dives: 200 - 499
    Location: Hudson Valley
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    How about a mesh-covered skeg type thing to go over it? Imagine an inverted cattle guard off the front of an old train, and instead of angle iron on it, have mesh. And obviously much smaller.
     
  8. Wildcard

    Wildcard Instructor, Scuba

    # of Dives:
    Location: Alaska
    5,258
    0
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    Jets work by sucking up lots of water, if you block it too much they won't work. Thats why they don't come with something like that. Good idea though.
     
  9. teknitroxdiver

    teknitroxdiver Solo Diver

    # of Dives: 200 - 499
    Location: Hudson Valley
    3,410
    297
    83
    Ah. I see. I would suggest larger mesh but then the weeds would go clean through it. Hmm.
     
  10. Wildcard

    Wildcard Instructor, Scuba

    # of Dives:
    Location: Alaska
    5,258
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    Im sticking with my suggestion about a stump jumper. Sounds like a smaller boat.
     

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