Page 1 of 2 12 LastLast
Results 1 to 8 of 12

Thread: Hull reinforcement

  1. #1
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Hull reinforcement

    Hi,

    Finished A levels so im back on the hover.

    I have been growing concerned for the lack of reinforcement on the hulls deck. With me and the engine im worried it might crack when it hovers?

    The deck is 6mm marine ply.

    Do you think that adding cross bars of 21mm square pine underneath the hull where the engine is would be a good idea?

    Thanks

    Nick

    Attached Images Attached Images

  2. #2
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Hull reinforcement

    dont put bits of wood under the hull, use the engine frame as the floor support, and weld cross bars out of box or angle the width of the hull.

    or embed the wood in the inside, with glass and mount the engine on the top of that.



    either way, yes it would be a good idea to have support pretty much as you have shown, behind the seat. on the inside tho!




  3. #3
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Hull reinforcement

    It won't crack when it hovers - don't forget you have 10-12 lb/ft2 pushing up against the floor when you are on cushion. When I built a Challenger in ply I just reinforced the engine mount positions with aluminium plates on the underside bonded on with a polyurethane adhesive like Sikaflex or similar. Each plate was about 100mm x 150mm.



    The bigger problem will be because of the skids when at rest - there will be a 21mm gap under the hull and when you step in or kneel on the floor, the floor will bend and stress. On our craft we use wider (100mm) strips of 10mm ply for skids and put two intermediate skids under the cockpit to reduce the gap that the floor is spanning.



    Kevin

  4. #4
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Feb 2006
    Posts
    0

    Default Re: Hull reinforcement

    For the eagle 1 It was just a piece of 6mm ply. When on the ground it was usually on grass so it didn't flex much. On water it flexed a bit but nothing too bad.

    As long as the top of the engine frame is secured properly, the engine shouldn't bend the floor too much. 6mm ply is strong stuff and can bend a significant amount.

    With them going across on the bottom, stones etc will eventually start pulling them off.

  5. #5
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Hull reinforcement

    Ok,

    Now i can see why you wouldnt do what i preposed...i dont want things hitting pine struts at right angles.

    I think im going to extend my engine mount sideways from the frame and then mount it to the hull. I think putting aluminium sheet to spread the load is also a good idea.

    Do you think that It might be worth hard mounting the frame to the top of the duct, so it cant flex. Jon i remember you saying it might be a good idea...better than using those flexible cotton bobins.

    Nick


  6. #6
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    May 2007
    Posts
    0

    Default Re: Hull reinforcement

    Hi,



    the guy that built his hovercraft in the attic, mentioned a few messages back with links, has a site where he details the whole

    job from start to finish...



    he set up he engine, fan, duct, etc, on a rig that can be lifted in/out of the hovercraft in one 'lump'.



    The link for the 'engines' page is: http://www.xs4all.nl/~wcasten/hoverh...l/steel%20page. htm



    This looks like it could spread the weight over several points.



    Regards

    Peter




  7. #7
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Hull reinforcement

    Cheers peter.

    I have designed my frame so it can be removed from the top side pritty quicly, just as you said. I think i got a clear idea now of what to do with the frame.

    Cheers all!


  8. #8
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Hull reinforcement

    hi nick



    i would extend the engine frame if it was me, with what you have done so far, its the easiest option. i wouldn't have a huge sheet of ally to spread the load tho! i would just have 75/100mm squares either side of the ply where you bolt thru!



    with you frame setup in the pic, i would not have rubber mounts at the top. bolt thru the duct and spread the load in the back of the bellmoutth with a short bit alu bar with a hole in, lying in the curve. you want the duct to stay where it is really

    the fan and duct postion will be held together.



    your engine is on mounts, are you going to use a flexi coupling to take up the engine movement on the mounts regards to the bottom pulley?

Similar Threads

  1. Hull for sale
    By Vortex - n/a in forum Hovercraft stuff for sale!
    Replies: 1
    Last Post: 3-Jun-07, 08:15 PM
  2. An old Hull
    By chrismdaly - n/a in forum General Forum
    Replies: 17
    Last Post: 20-Oct-06, 05:57 AM
  3. Hull 4 sale
    By Don83000 - n/a in forum Hovercraft stuff for sale!
    Replies: 0
    Last Post: 9-Oct-06, 01:38 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •