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  • F25 Scout?

    Gone7 Gone7 16.02.2018 11:39
    Hehee...yes, it's amazing! He just keeps going and going :lol: Good to have him around.

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  • F25 Scout?

    Kelley Kelley 16.02.2018 10:45
    It's now 2018 and Barry is still kicking!

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  • Fly by wire

    Hovernautic Hovernautic 05.12.2017 05:26
    hi... i saw your video and this is also a good working solution..

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  • Fly by wire

    Hovernautic Hovernautic 05.12.2017 05:25
    Hi Scott.. for now i´m not sure about the Servos/Motors.. i will try different typs.. your idea with ...

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  • Fly by wire

    bilco5 bilco5 05.11.2017 09:48
    Some time ago I posted an article showing how I electronically operate my trim wing with a Lenco Trim ...

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  • Introduction and the Hull

    Scott Crane Scott Crane 03.11.2017 10:21
    I know its been awhile, but how is this project going? I've been getting epoxy resin from ebay ...

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  • Fly by wire

    Scott Crane Scott Crane 03.11.2017 09:55
    Interesting idea. What kind of servos where you planning on using? (although you did say motors) I ...

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  • Starter Motor Mounting

    Pete Pete 09.08.2017 23:48
    Sorry Guy ..... news to me! Duuuuh! and all the trouble I had amending that post when I realised that ...

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  • Starter Motor Mounting

    Gone7 Gone7 09.08.2017 17:27
    Glad to hear that you got it figured out Pete. We're all inching our way to a finished craft. ;) Hey ...

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  • SevZilla Breaking News

    Gone7 Gone7 09.08.2017 17:25
    Very nice! It's great to hear that you'll continue with another project. I finally tried some of the ...

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  • Starter Motor Mounting

    Pete Pete 08.08.2017 13:08
    Hi Guys Many thanks to Gone7 and to you Guy for your advice. ........ Problem now solved! The "Gentleman" ...

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  • SevZilla Breaking News

    SEVZILLA SEVZILLA 08.08.2017 11:23
    Guy is your craft done? I don't see any updates.

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  • SevZilla Breaking News

    SEVZILLA SEVZILLA 08.08.2017 11:18
    I think a mix of Explorer / Mariner 1 3/8'' floor DIAB foam. No core cell foam this time price 2x ...

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Lone Star Hovercraft

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Lift Engine

[Brock14u]

 

 Vacuum Bagging Setup

    From the information in the UH construction book and a few websites I successfully created a vacuum bag.  Although I had many doubts about the material that I was using I was fairly confident that I was capable of building a vacuum bag.  The first step was the create a material list.

  1. 16'x100' roll of 4mil clear poly
  2. A couple rolls of duct tape
  3. some old blankets
  4. a shop vac
  5. (3) 2"x10' schedule 40 PVC
  6. (2) 2" 90° elbows
  7. (2) 2" 45° elbows
  8. (2) 2" 45° wyes
  9. scissors
  10. drill or rotary tool
  11. saw
  12. bathroom scale

    The following list is the materials I used for epoxying the hull:

  1. (6) sheets of 2" extruded polystyrene (I used Owens Corning Formular 250)
  2. (1) gallon of epoxy resin
  3. (1) bottle of hardener
  4. some scrap dowel rods (for stirring)
  5. plastic party cups
  6. 2 pump kit (for dispensing resin and hardener)
  7. hand saw
  8. sharpie
  9. paint roller
  10. paint brush
  11. 3" screws
  12. screws driver
  13. square
  14. tape measure
  15. straight edge
  16. random orbital sander
  17. latex gloves
  18. utility knife (to cut plywood works great!)
    I didn't want to start off my first experience with epoxy by epoxying a 14' hull.  So, I started with the lift duct plywood.

First epoxy

  • Started by what would seem to be an easy step but with all of the excitement I found out the hard way.  The 2 pump kit (fig 2) comes with four pieces two pumps and two extensions all the same size.  The resin container is quite a bit larger so the pump and whole extension fit into the bottle.  The hardener on the other hand is in a smaller bottle and the whole extension is not needed. (very messy and wasteful mistake)

 

fig 2

  •  After cutting the plywood into (2) 20"x48" plywood sheets, cutting a 2"x20" piece of fiberglass, and cutting a piece of poly to work on since the cured resin will not stick to it. I mixed my first batch of epoxy.

 fig 1 

  • Per the directions on the bottle I used a ratio of 3.5 to 1 of resin to hardener in a plastic cup and mixed together with a scrap piece of dowel rod.
  • The mixture was thick at first and thinned as it was mixed.
  • Used a small paint brush to apply epoxy to a 1.5" section at the 20" edge of the plywood, placed the fiberglass on top, and applied more epoxy to the top of the fiberglass. (in hindsight with information gained from the result I think I used way too much epoxy (fig 3)).
  • Covered the plywood with another piece of plastic to put weight on joint.

 fig 3

  • The remaining epoxy which was way too much was set outside to see what would happen (fig 4).  And an exothermic reaction ensued melting the cup and the ice under the cup within 10 min of setting it outside. 


fig 4

  • Lessons learned after epoxy dried:
  1. You can apply way too much epoxy easily.
  2. Get the epoxy out of the cup fast.
  3. Too much epoxy = weak bond (fiberglass didn't even stick to plywood)
  4. Have plenty of gloves handy.
  5. Temperature has direct effect on epoxy curing (as you will find out didn't really learn this the first time).
  6. Epoxy doesn't stick to plastic.
  7. Epoxy does stick to clothing, boots, and concrete.
  8. Brushes are one time use.
  9. I need help (as you will find out didn't really learn this the first time).

 

Cutting Out Hull Foam

  1. Started by setting down and figuring out how to make the most out of the foam with as little waste as possible.

 

 

top layer                                               bottom layer 

            
 
 SHEET 1             SHEET 2             SHEET3
 
SHEET 4             SHEET 5            SHEET 6 

 

  • A=16"X96"    G=18"X36"
  • B=48"X96"    H=48"X96"
  • C1=18"X48"    I=16"X36"
  • C2=18"X48"  J1=18"X48"
  • D=16"X36"    J2=18"X48"
  • E=48"X79"     K=48"X96"
  • F1=12"X36"    L=16"X96"
  • F2=6"X36"

 

 
  • Marked sheets with a sharpie and square.
  • Used a hand saw to cut pieces apart (very messy way).
  • Would of used hotwire but I wasn't confident I could cut a straight line.

Now it's time for the test vacuum!

Tony 7 hrs


 


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Author / Member : Acstraws

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