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Basics of Vacuum Bagging Fins Continued from page 3 Continued on page 5 Apogeerockets.com/ZephyrJr Figure 4: Quick-Lock seal will close off the open end of the bag so the plastic is air-tight In vacuum bagging, we’re almost always using epoxy on the surface of the fin, and the goal of the process will be to smooth out the epoxy and give us a uniform surface finish. This was what I was doing when I was making the lightweight fins for the competition rockets. I only used epoxy to skin over balsa wood fins. But you can also use this same process for bonding skins to the surface of the fins as well. This is how it is normally used, because it will greatly increase the strength of the fin. The stiff skin provides the structure since it is more rigid than the balsa wood. Some types of skin materials that have been successfully used are: tissue paper, fiberglass cloth, carbon fiber veil or carbon fiber cloth. Tissue paper is the weakest, but it is “plenty strong” for competition rockets if you need more strength. An advantage is you can get it in colors, so it provides decoration as well as stiffness. Fiberglass cloth and carbon fiber are typically used for higher power rockets where you really need a lot of extra strength that you can’t get from ordinary balsa or wooden fins. It will add some serious strength to your fins, which you may need for models going supersonic that tend to flutter and shred. Carbon fiber is significantly lighter weight than fiberglass, but it is more expensive. The advantage of a woven cloth from either material is that it can conform to a compound curve. So if you have an airfoil sanded into the wood underneath, the cloth will follow the curve nicely without having to fold over itself. Tissue paper doesn’t conform, since it can’t reorient its fibers easily, and will have a crease in it if you lay it over a compound curved surface. Figure 5: Tubing clamp to pinch off the flow Page 4 Issue 569 / Mar. 15th, 2022PDF Image | Basics of Vacuum Bagging Fins
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