New jet propulsion system

Discussion in 'Boat Design' started by Guest, Oct 28, 2003.

  1. Guest

    Guest Guest

    Does anyone have any comments on the new outboard
    diesel jet propulsion unit. www.jetpac.us ??
     
  2. Willallison
    Joined: Oct 2001
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    Willallison Senior Member

    my first impression is that the unit is rather heavy - at 428kgs its significantly heavier than say Mercury's 150hp o/b (193kg). It's a bit lighter as Mercrury 2.8L diesel (150hp) but as it's bolted to the transom (rather than inside the boat) it would have a more significant effect on the LCG
     
  3. Guest

    Guest Guest

    RE Heavy

    what about it being an automotive engine and no prop?
     
  4. Willallison
    Joined: Oct 2001
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    Location: Australia

    Willallison Senior Member

    I only had a very quick look at the site, but I would be very surprised if it isn't marinised properly. Most so-called marine engines are derived from auto (or truck) engines, so I wouldn't see that as a problem.
    As for jet vs. prop - that's a whole topic in itself - depends on the application, budget etc etc etc. But if I was looking for a 150hp diesel engined jet propulsion system, I'd have a look at it, but as I said before - the weight so far aft would definitley be a concern.
     
  5. Nomad
    Joined: Feb 2002
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    Location: Florida

    Nomad Senior Member

    The pack does float it's self rather well. The test ride was impressive.
     
  6. Guest

    Guest Guest

    I am going down to IBEX and than to the Ft. Laud show and
    I will take a ride and let you know. You said its heavy but it is self
    bouyant, and where its mounted evens out the c of g. i will
    give my feed back once I test it
     
  7. Willallison
    Joined: Oct 2001
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    Location: Australia

    Willallison Senior Member

    I take it you've been for a spin then Nomad - what else did you think?

    I'm assuming that since it can be fitted to any boat with a deadrise of between 5 & 22 degrees, only a small area (including the pick-up) is in contact with the water when the vessel is on the plane. And, unless it creates enough of its own dynamic lift to remain 75% self-supporting (manufacturers claim) when it's on the plane then the LCG will be affected.

    I'm not saying that it's no good or doesn't work - merely expressing my concern at placing so much weight aft of the transom....
     
  8. BVI Jon
    Joined: Sep 2003
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    BVI Jon Junior Member

    Looks interesting, but is it going to possably be limited to boats:

    a) with a shallow "V" or less,

    or

    b) boats that only operate in reasonably calm water.


    Jon.
     
  9. Guest

    Guest Guest

    MUST BE GOOD IT WON THE INNOVATION AWARD AT IBEX 2003
     
  10. yipster
    Joined: Oct 2002
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    Location: netherlands

    yipster designer

    [​IMG]
    sure makes me wonder about -outboard- jetdrives again...
     

  11. Guest

    Guest Guest

    handling

    i live in the town where they make these JetPac's and have been out on both their boats fishing. All I can say is the KeyWest 196 is a shallow water fishing machine - its amazing how well it handles at slow speed making finding fish in the shallows a worry free experience. As for the offshore capabilities, the 275 gas JetPac had more than enough power to travel in 3-4 footers off of keywest, but I was not impressed with the ride of the Angler 220, Trims tabs could help that tho. Personally, my next boat will not be prop but a JetPac.
     
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