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Scratch building my new slope wing

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    Scratch building my new slope wing

    It's been many years that I have not posted any construction threads. Time spent on family, work and studies has robbed quite a fair bit of time from me for any meaningful builds. Nevertheless, I would still do something I have missed from so long.

    As the monsoon wind picks up, so does the anxiety to get new slope soarers. Not wanting to commit too much on buying, I planned to build a new version of a slope wing I build last year. the previous model flies very well, but is too light to reveal it's full potential. Lacking the capacity to ballast prompts me that I have been too conservative during the construction. For that, a heavier and stronger model will be called for.

    Things started off pretty simply. Printed out the patterns from my own plans and making templates from cardboard.
    Attached Files

    #2
    Foam wing cores are simply hotwire cut from 2" extruded blue polystyrene foam sheets.
    Attached Files

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      #3
      I used PVC sheets as the carriers for wet layup.

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        #4
        Super

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          #5
          Time spent on fishing too.hehehe
          Hangar
          -Extreme Flight 88" Edge 540T
          -Extreme Flight 88" Extra 300
          -Extreme Flight 78" Extra 300 exp
          -3D Hobby Shop Extra 72" Extra 330SC
          -Extreme Flight 64" MXS exp
          -Extreme Flight 60" Extra 300 exp
          -Extreme Flight 48" MXS exp
          -Extreme Flight 48" Extra 300 exp

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            #6
            Joe is THE man of scratch building!!!

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              #7
              Fuselage plug is hotwire cut from a series of templates for the side the plan profile. The wing saddle and canopy are cut out first, but later lightly glue back to provide structural support before carving the cross sectional profiles.

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                #8
                Blue foam has quite a bit of internal stresses and will warp and distort during carving and sanding. To stabilize the plug, I epoxied UD carbon strips along the fuselage and vertical fin to stiffen it up.
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                  #9
                  The fuselage is now carved and sanded to shape.
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                    #10
                    After waxing the inner surface of the PVC sheets, I masked off and spray painted the patterns. The florescent green is quite translucent and needs to be backed by white paint. At this time, the painting is protected from sticking by a sheet of decal backing paper.
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                      #11
                      The wings are bagged with 1k carbon and 100g glasscloth on both side overnight and weighted.
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                        #12
                        The left wing turns out very well with the paint.

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                          #13
                          Unfortunately, I got impatient on the right wing and placed the layup under sun to expedite the curing. It did helped the resin curing but screwed up my painting. I ended up sanding the remaining paint away and did an external re-painting.Click image for larger version

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                            #14
                            Each wing panel weighs about 113g and is super stiff and strong.

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                              #15
                              Hi Joe,

                              May I ask you a couple of questions?
                              1. What is the material you put in the bag to soak away the excess epoxy?
                              2. What do you use for the release agent?
                              3. The coupling you fit to the vacuum bag, what do you call this or where can we get this?
                              Thanks in advance

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