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Views: 432
Skins on wax paper. Dont want the sticky tow sticking to your table -
Views: 587
Mist /spray the tow with 3M 77 spray adhesive and lay over the skins. Apply wax paper over the tow and roll it to contact the glass skins -
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cut around and remove disser tow rack -
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cut by laying your fabric template on top before removing the wax paper -
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I then flip the skins over so the tow is trapped under the glass for the layup -
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wet out real good -
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roll the tow flat -
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Trace around or cut around your mylars -
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Im not concerned with maxing out the mileage of my glass for this demonstration but note two identical pieces -
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Just for a edge to go by so the weave of the fabric is the same direction I placed the root edge at a 45 to the warp direction of the fabric ["warp" runs the length of the roll , "fill" runs the width of the roll -
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note how the top skin mirrors the bottom skin. If the warp direction of the fabric shrinks it will shrink against the warp of the lower skin. Im using a balanced fabric here so warp has approx. the same threads per inch as the fill so its not as important
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kevlar tip patch is large but could be trimmed -
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.067 HM carbon wing rods. Theses rods are like steel compared to some of the cheap carbon rods I have bought. 4 rods are enough with these rods . -
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3/4 wide 1.7 o bias kevlar LE material [adhered to transfer tape] -
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pre-cured uni carbon tail spar caps;
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Pay attention to panel lengths. -
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gently peel away pulling toward the TE -
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To help get a more elliptical shape to the LE a small amount of foam can be sanded off and hand sanded to smooth the transition of the panels. The cores shown are a 4 panel design [edge] -
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before and after -
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Fine sponge sanding pads work well -
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score where you want the kevlar to fold -
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in this case there is a layer of glass over the kevlar that will leave a chalk like film until hitting the kevlar -
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be sure to go through the carbon tow -
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flip the wing over and cut through the glass and into the balsa strip in hinge gap -
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always peel tape from skin at a sharp angle -
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I usually stop around here and hand file some more from the kevlar in the fold. As I keep making scores I can feel it flex more and become freer -
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do what ya gotta do and get the balsa out -
Views: 471
a nail file works nice to sand the excess glass back from the gap after removing the balsa
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hardpoint should be inline with brass inserts or binder posts -
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supergee wing in picture shows front wing bolt location 1.750 inches back from LE of wing -
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This is called :flox . Its a cotton fibre mix that works very well for making hardpoints when mixed with epoxy. A good replacement for micro balloons for structural joints. Very hard to sand once cured.