Jet boat designer needed

Discussion in 'Boat Design' started by Sid, Oct 24, 2020.

  1. Sid
    Joined: Oct 2020
    Posts: 14
    Likes: 0, Points: 1
    Location: Poland

    Sid Junior Member

    @Mr Efficiency thanks, is performance of jet inboards much different than outboards? Why is that?
     
  2. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,061
    Likes: 640, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    There are more frictional and other losses involved in the drive than with a propeller, but that is acceptable if running a prop is going to see you unable to operate in shallows, destroy props and smash lower units. Your HP designation on the motor already factors that in. An axial pump would probably be more efficient, but mechanically more complicated and heavier, if they tried to adapt it to an outboard. Unless you are doing a lot of hours of running, the outboard jets lesser efficiency isn't a problem, but you wouldn't use one as a replacement for a normal outboard, unless you want to use 30% more fuel for the same performance. They are a specialty product, for a specific purpose, and where normal outboards can't operate, they can.
     
  3. Sid
    Joined: Oct 2020
    Posts: 14
    Likes: 0, Points: 1
    Location: Poland

    Sid Junior Member

    Oh, I thought you ment there was significant difference in performance between inboard jet and outboard jet.
     
  4. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,061
    Likes: 640, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    The inboard is probably more efficient, but it doesn't really matter that much for recreational use, and you have the outboard. How often would you anticipate using the boat ?
     
  5. Sid
    Joined: Oct 2020
    Posts: 14
    Likes: 0, Points: 1
    Location: Poland

    Sid Junior Member

    Sure, asking for a probable next boat already :) As for use frequency I’d say once a week on average.
     
  6. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,061
    Likes: 640, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    That is a fair bit of use, I would say 50 hours a year is about the average for recreational boats engine hours.
     

  7. Sid
    Joined: Oct 2020
    Posts: 14
    Likes: 0, Points: 1
    Location: Poland

    Sid Junior Member

    The season spans 5 months, so I should be on a safe side.
     
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.