Twin jet 13ft

Discussion in 'Boatbuilding' started by Jetter, Dec 23, 2012.

  1. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    I have been building a Kevlar / glass ski boat 3.5 metres long it has twin 80 hp triple cyl 2 strokes powering it, the motors and jets are all alloy and weigh 60kgs each. Start of project
     

    Attached Files:

    Last edited: Dec 23, 2012
  2. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    Here is a pic of the engines
     

    Attached Files:

  3. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    A pic from the back of the boat
     

    Attached Files:

  4. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    The jet install
     

    Attached Files:

  5. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    2 stroke on the bench.
     

    Attached Files:

  6. tunnels

    tunnels Previous Member

    Single or twin installations in small boats !! which is normally the faster of the two ?? a single 160 hp or your twin 80 hp and why ??:eek::confused:
     
  7. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    3 people with a bench seat and a spoiler to be added
     
  8. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    Well originally was going to put one in, but had a deal to good to pass up so let's have a play. Should turn good!!
     
  9. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    The hull was doing 60 mile hr with 75 horse outboard
     
  10. tunnels

    tunnels Previous Member

    SO WITH ONE 80 HP JET HOW FAST ?? :confused:
    WITH 2 X 80 HP JETS TWICE AS FAST ?? :eek:
     
  11. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    2 stroke jets don't develop the same torque as a 4 stroke. Top end speed is good
    , it does not mean twice as fast. Have only had the engines running on the boat while still on trailer in the water. Still need to complete steering. I will update when how fast it goes in the next few weeks.

    We will have plenty of thrust and torque to pull a skier with 2x 6" jets.
     
  12. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    The thrust on the trailer was very promising
     
  13. midnitmike
    Joined: Apr 2012
    Posts: 257
    Likes: 20, Points: 0, Legacy Rep: 167
    Location: Haines and Juneau

    midnitmike Senior Member

    Unfortunately I'm unfamiliar with jets in general...could you give me some more details on these units. I'd like to power a flat bottom river skiff and I'm looking for powerplant options.. these look perfect.

    MM
     
  14. Jetter
    Joined: Dec 2012
    Posts: 17
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Australia

    Jetter Junior Member

    I would say go for it just use a second hand jet ski pump and motor combination 700cc would be fine for a single person 9ft boat . We're you thinking twin or single? The thing with fitting into an existing hull would be fitting the pump into the stern of the existing hull but not to hard. Do you have more details of the boat?
     

  15. beachcraft
    Joined: Nov 2011
    Posts: 49
    Likes: 2, Points: 0, Legacy Rep: 30
    Location: Marinette

    beachcraft Junior Member

    Very cool! Where did you get the motors and jets from?
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.