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Vacuum bagged wings are quick to build, light weight, and have excellent aerodynamic and structural performance. The method described, sometimes called the “glass slipper”, produces wings with a smooth surface requiring only a slight cleanup of the leading and trailing edge. The steps in the process are: 1. Cut the foam core out with CNC hot wire or CNC mill 2. Cut out the Mylar, fiberglass, Kevlar strips, breather and vacuum bag tube 3. Tape the Mylar together with ~1/2 inch gap at the leading edge and release wax the Mylar 4. Glue Kevlar strips to the leading edge and aileron hinges with light coat of 3M 77 spray adhesive 5. Lay the fiberglass on the Mylar. Pour resin on near the middle and squeegee out the resin 6. Wrap the Mylar/fiberglass around the foam core. Tape trailing edge and tips to keep the foam core in place. 7. Add the release film, breather and insert in bagging tube. Attach the vacuum connector and the end clips 8. Turn on the vacuum pump and smooth the bag over the wing as the pressure drops. Check for and seal any vacuum leaks. 9. Allow resin to set. Remove wing, sand leading edge and trim trailing edge. Cross Section of layup materials Revision: Original Release 10/31/15 Page | 2PDF Image | Vacuum Bagging Wings Instruction Manual Purdue Univ
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