Twin Jet Boat Build

Discussion in 'Metal Boat Building' started by Sms986, Oct 15, 2020.

  1. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    ..I wouldn't say all of them lol.
     
  2. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    Here are some pictures of one of the engine/pump assemblies
     

    Attached Files:

  3. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    And a few cad drawings of the proposed hull
     

    Attached Files:

  4. BlueBell
    Joined: May 2017
    Posts: 1,268
    Likes: 246, Points: 63
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    I had an RZ350 Yamaha bike for seven years.
    Rebuilt the engine the second day I had it.
    New reeds and pipes.
    Ridiculously fast and light.
    I can't believe I survived.

    What's your thesis on?

    Thing about custom jet installs is getting it too work optimally.
    The smallest little thing can set them off.
    Are they indeed Hamilton jets?

    But this project is a recipe for FUN!
     
  5. Mr Efficiency
    Joined: Oct 2010
    Posts: 8,926
    Likes: 596, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Sounds like some women, mercifully few, of course ! :D
     
  6. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    My thesis is a on separation control via ground effects for road vehicles (CFD).

    I'm not too worried about optimal performance, good performance will be good enough for me!

    No, they are not Hamilton jets. They are the stock yamaha gp1200 jets
     
    BlueBell likes this.
  7. BlueBell
    Joined: May 2017
    Posts: 1,268
    Likes: 246, Points: 63
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    With such high jet losses to begin with (up to 50%), a misplaced anything could lose you another 40% and your going nowhere fast.
    I'm not referring to worrying or even concern about efficiency, just trying to keep it from being a dog and waste of money and time.
    Replicate to original instal configuration and hope for the best.

    I guess you are familiar with the changes this year in F1 racing regarding ground effects.
    They are essentially back on in an effort to clean-up dirty air for the following car.
     
  8. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    Lol, it sounds like you are an Aero guy. I'm still an Aero "kid." I also honestly don't follow the F1 as much as a lot of fellow students do. I am much more interested in passenger cars and such (and boats). I actually wanted to be an IC engine guy but certain people who I will not name here are making the IC engine dream less practical.

    I planned on doing some CFD on this hull (basic RANS is all I am really comfortable with at the moment) to see how these will do. I may publish a paper on it. If I do, I'll get much better insight on the performance. May be able to make my own design. But nonetheless, nothing will be cut in stone until I run some simulations. Possibly a comp between the ski hill and the boat hull. I do think these will work fine though, as the pumps are flush mounted on the bottom of the ski with no dip or spoon fore the intake grate.
     
  9. BlueBell
    Joined: May 2017
    Posts: 1,268
    Likes: 246, Points: 63
    Location: Victoria BC Canada

    BlueBell Ahhhhh...

    You may get a kick out of this:
    I put an air dam made out of a strip of old conveyer belt on my Datsun 510.
    It hung straight down and straight across from a pair of 2x4's bolted to the bumper mounts.
    It was an ice racing car but I drove it for transportation. I was young.
    The dam came down to within two inches of the road.
    Didn't go any faster (95MPH in third or fourth gear, didn't matter),
    but the ride stability was astonishing, felt like a 2-ton Cadillac.

    Thanks for indulging the thread drift and my apologies.
     

  10. Sms986
    Joined: Oct 2020
    Posts: 14
    Likes: 1, Points: 3
    Location: NC

    Sms986 Junior Member

    That is awesome haha.

    I always get a kick out of the tuners with huge wings that create 10x more drag and will never get their cars fast enough to see the beneficial downforce (on a front wheel drive car anyway lol)
     
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.