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Thread: Kaboat with jet outboard

  1. #21
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    Quote Originally Posted by Alaska_Lanche View Post
    Nomad, great pics man!! Where did you get the jet unit for a 15 hp 2 stroke outboard?

    Thanks), such units came on local market just last year, quality seems good:

    http://www.eastmarine.ru/vcd-83808/catalog.html

    Made in Taiwan, cost abt Usd 1,000

    or Yamaha - 15 + Jet Unit (without propeller):

    http://www.eastmarine.ru/vcd-87916-1...goodsinfo.html

    Yamaha made in Japan, jet unit in Taiwan, соst total (motor + jet unit) Usd 2,443

  2. #22
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    Hopefully those smaller jets will become available in the U.S. soon. Thats exactly the setup that I would like. How shallow of water have you been able to run the setup in and how much load does it hanlde?
    Thanks for the posts and pbotos!

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  6. #26
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    Found on Youtube, SUZUKI-20 (4 strokes) Jet:



    The owner said on forum that 300 kgs of load is ok, 250 kgs is funny, 350 kgs is the limit. The boat on video is "SOLAR - 380 Jet (tunnel)

  7. #27
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    Thanks for the posts nomad. That solar looks like a nice inflatable for a jet, seems similar to the alaska jet ranger series inflatables which are about six times the cost of a kaboat. I wonder if that Suzuki would be too heavy for the kaboat. I like that little Yamaha you have but they don't sell 2 strokes in the United States anymore.

  8. #28
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    Suzuki's 20HP is only 97LBS. http://www.suzukimarine.com/Product%...DF20A_EFI.aspx and these guys make a conversion to it. http://outboardjets.com/jet-drives/

  9. #29

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    Quote Originally Posted by Spanner View Post
    Suzuki's 20HP is only 97LBS. http://www.suzukimarine.com/Product%...DF20A_EFI.aspx and these guys make a conversion to it. http://outboardjets.com/jet-drives/
    It should be about 15 pounds lighter than a 25/18 Merc 2 stroke jet. It just might work but looking at $4200-$4500 by the time you get the motor and the jet pump all bought.

  10. #30

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    Luke, They had a 20 HP Suzuki outboard jet at the Sportsman show this spring a guy bought it for his Kaboat I was told. Never heard how it worked out. Your price sounds about right or lo. Kurt

  11. #31
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    So, we did it:

    "SATURN KaBoat SK470XL" with tunnel and anti - cavitation plate


    - No "cobra",
    - No "banana effect",
    - No "dolphin",
    - Draft of intake = draft of kaboat,
    - Any position of navigator and passangers (or cargo),
    - 31.5 kmph under 120 kgs in cockpit,
    - 27 - 29.4 kmph under 210 kgs in copckpit (2 on board),
    - 21 - 23.5 kmph under 310 kgs in cockpit (3 + 1 on board).














  12. #32
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    No more "banana effect":


  13. #33
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    Now speed under jet (15 hp engine) is equal to propeller 9.8 hp and 9.9 hp:


  14. #34
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    No more "cobra" at any position of navigator in cockpit:


  15. #35
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    Excellent work nomad! How difficult was the tunnel to fabricate. This is exactly the type of setup that I would like to put together! What did you do to address the banana and cobra effect? Just the cave plate/ tunnel?

  16. #36
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    The cave plate made by local boat workshop according to our request as follows (from up to down):
    4 layers of PVC – 1 100 den
    5-6 layers of foam plastic (isolation), 10 мм each one
    Solid plastic for tunnel walls and aft part of the cave plate
    4 layers of PVC – 1 100 den

    Tunnel dimensions: 210 mm х 300 мм х 60 мм

    Minimum plate length abaft transom 110 мм

    In fact the cave plate has a small angle with bottom, lifting aft of the boat and heavy motor underway and killing cobra. But I was very surprised that it also killed banana (at 0.7 bar in the bottom) and porpoising… It seems that solid plate below foam plastic could work even better. I have no ideas that happen with foam plastic in case of strong impacts on rivers. Maybe we add polyurethane plate 5-10 мм inside this construction later on. According to my earlier tests under propeller, 10 mm plywood below air deck increased speed from 30 to 36 kmph and killed banana. I found design on photos really good, but her potential of speed is 36 kmph, so I think you may reach it under 20hp SUZUKI Jet.)

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  18. #38
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    A copy of my message to Hannu YK:

    Last saturday we tested SK470XL under Mercury - 25 Jet, Yamaha - 15 Jet and
    Nissan Marire - 9.8 propeller.

    Maximim speed of kaboat after modification (with tunnel):
    Mercury - 25 Jet: 33.4 kmph
    Yamaha - 15 Jet: 31.5 kmph
    Nissan Marine - 9.8: 32.5 kmph

    Transom lift for jets: 190 mm
    Тransom lift for propeller: 90 mm (it seems that 70 - 80 мм will be a bit better)

    No dolphin, no cobra, some benting on white water.
    Ones we turned on rock we received a lot of water in cockpit from starboard side.
    That means even big kanoe on white water is less safe than wide boats, as you well know.
    Thats why my position is jet kanoe must have big ballons and self - draining design.

    We both found Mercury - 25 Jet workable, but making little sense for SK470XL due to
    similar performance or Yamaha-15 Jet at twice fuel consumption and heavy weight.
    We both found Yamaha - 15 Jet optimal for SK470XL as well as Nissan Marine - 9.8 prop.

    We had good experience on "Fish and Hunt" under jet with rubber protection of hull. She is
    not benting on white water and received no damages of PVC within last 3 years despite on plywood deck,
    so i think that solid plastic or plywood below air deck (and rubber protection) will elininate benting of kaboat and jumping
    of intake of jet unit from white water time to time. Due to no tunnel Zodiac's intake was under repair very, very often
    and needs rubber intake, i guess.

    We also found that tunnel design allow to lift propeller of Nissan Marire (Tohatsu) - 9.8 70 - 90 mm up, but
    prop has no chance to compete with both jets on white weater, as you may see on video below.

    We found behavor of kaboat under jet less impressive than wide jet inflatables under 25 - 30 hp outboards,
    but it's impossible to carry them along and paddle. Flotation ability of jet kaboat in compare with ordinary jet boats is still a question
    for me. I think kaboat jet has no chance to compete or too dangerous on realy big rapids, but very passable on extremelly shallow
    rivers with moderate stream at low fuel consumption and with ability to be carried by one person.

    I have no information about manufacture of jet units for Yamaha - 15, just know that it made in Taiwan. Probably
    such units ordered by russian companies only due to outboard jets and inflatables are very popular on local markets, i don't know.
    I think you may order such unit on www.eastmarine.ru without any problems basis on delivery Murmansk or Finland/Sweeden.
    Delivery from Vladivostok to Murmansk is cheap, not more than USd 50 in any case. I don't think that you'll have any problems
    with customs due to price of jet unit is abt USd 1000 only, at least with rusian customs definitely.


    Photoes:http://photo.qip.ru/users/sergeysokolov/96725560/all/

    Video:
    https://youtu.be/zqTyF21TK-E
    https://youtu.be/mhhEqNnWFRQ
    https://youtu.be/KRxAJpF2n0A
    https://youtu.be/j0WDkuxPdKk
    https://youtu.be/OZiTu8tAgz4
    https://youtu.be/Cz_Uq2lZpCw

  19. #39
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