3.5m HDPE jetboat

Discussion in 'Boat Design' started by HDPE JET BOAT, Oct 9, 2012.

  1. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member

    despite what someone people may say this stuff can not be glued, it has to be mechanical ie welded or screwed together

    the boat is very rigid now, if i sit on one corner and another person sits on the opposite and we rock the boat their is very little distortion but before i welded the sides up i could get both ends to touch the ground
     
  2. MaV
    Joined: Dec 2012
    Posts: 4
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Netherlands

    MaV New Member

  3. Dhutch
    Joined: Oct 2008
    Posts: 83
    Likes: 1, Points: 0, Legacy Rep: 22
    Location: Cheshire UK

    Dhutch Junior Member

    I like it, diffrent anyway.
     
  4. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

    With flame treatment and the right glue, gluing HDPE is somewhat effective. HDPE looks even more attractive when foams, reinforcing fibers, cross linked PE, pressurized compartments and molded in metal reinforcing are considered.
     
  5. nimblemotors
    Joined: Jun 2009
    Posts: 244
    Likes: 3, Points: 0, Legacy Rep: 4
    Location: Sacramento

    nimblemotors Senior Member

    VERY nice work, first i've seen of sheet plastic made into a boat.

    Couldn't you somehow laminate a thin sheet over an aluminum hull
    to get its advantages without the extra weight?

    Does marine growth attach to HDPE like most surfaces?
     
  6. portacruise
    Joined: Jun 2009
    Posts: 1,212
    Likes: 72, Points: 48, Legacy Rep: 218
    Location: USA

    portacruise Senior Member

    Thanks for the information.

    Some HDPE kayaks and even fiberglass ones that sit 100 % exposed look somewhat faded where the sun hits after a few years. Maybe just the surface color or sheen affected as they still seem to be quite strong. Perhaps there is a dressing like armorall that helps...

    I wonder are the rotomolded boat hull structures thicker in the critical stress areas, or just uniform thickness all around, like those being made by welding (except for thicker joints) ? Seems like trash cans, barrels, and dock floats are uniform thickness, but these are not critical structures...

    Porta



     
  7. jonr
    Joined: Sep 2008
    Posts: 721
    Likes: 11, Points: 0, Legacy Rep: 57
    Location: Great Lakes

    jonr Senior Member

  8. KK Tipton
    Joined: Dec 2012
    Posts: 4
    Likes: 1, Points: 0, Legacy Rep: 13
    Location: USA

    KK Tipton New Member

    Pioner boats video explains it all (for rotomolded boats):

    https://www.youtube.com/watch?v=abKTUi5Yd9s

    Triumph boats in the US are built this way also...but they totally foam fill them.
    They are high density PE I think?

    Pioner are low density PE. Hollow on inside. Some foam slabs inserted.
    Maybe that works better in cold water?
    More flexibility at low temps?



    The Leister extrusion welding guns to make PE sheet boats are very $$$
    The S2 is $5600 USD I think?
    Cheapest decent extrusion weld guns are $4000.

    Our NZ friend borrowed his S2 for the jetboat build possibly?
     
  9. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member

    alloy has a very high cof compared to HDPE so it grabs when you touch the bottom, most ppl put a strip down the delta to help it slide better

    the plastic got to about 70 deg c the other day in the sun and grows about 10mm/1m
     
  10. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member


    i did borrow it to begin with but ended up buying one instead
     
  11. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member


    i used to work for a company in New Zealand making rotomoulded boats, to get it thicker the area of the mould was sprayed with black paint to get the area hotter their for making that area of the boat thicker

    http://www.marinerevolution.com/sw2400.htm
     
  12. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member

    engine bearers made tonight, ill dry fit the engine in over the next few days and start tacking it all up, almost getting close now :D
     

    Attached Files:

  13. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member

    i got the engine it tonight, i forgot how heavy it was, looks like its going to come together nicely
     

    Attached Files:

    1 person likes this.
  14. LilWake
    Joined: Feb 2012
    Posts: 149
    Likes: 7, Points: 0, Legacy Rep: 53
    Location: Minneapolis, MN

    LilWake Senior Member

    This is AWESOME! Cool stuff so far! What motor are you using? Is it the Polaris motor that's from the same Polaris Ski your pump is from? Can't wait to see more!
     

  15. HDPE JET BOAT
    Joined: Oct 2012
    Posts: 81
    Likes: 5, Points: 0, Legacy Rep: 55
    Location: New Zealand

    HDPE JET BOAT Junior Member

    yea its a 1999 Polaris 1200 fetich Genesis i imported from USA. i have stripped just about every nut and bolt from the ski, its surprising how many they have and its saved a lot of money, apart from the cost to build the hull the only other item i will have to make/buy is the intake grill, i have some ideas of how to optimize its performance and reduce the chance of stones getting jammed in the grill, preventing those mid winter swims :D
     
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.