Fiberglass Techniques For Radio Control Airplanes

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I've seen a number of planes, especially foamies, which could use a little beefing up. Many people just use carbon fiber rods, but there are many cases where fiberglass is superior. Carbon fiber requires you to cut into a model and there are many areas requiring support that do not follow straight or even curved lines. The Hobbyking Skipper tail section is a good example of an area where you would not be able to install carbon fiber rods to support the rudder properly. There is simply not enough area below the rudder to properly stabilize a carbon fiber rod. Also, cutting into the rudder could weaken it and the only way to again strengthen it is to apply a considerable amount of glue, which would negate the benefits of the light carbon fiber rods. By using fiberglass, you can apply a support structure to the surface of the model which will cradle it on all sides and give it even and substantial support for very little weight. Use fiberglass where you don't want the structure to bend at all. If you want flex, do not use fiberglass. I have a video with a small plane I call the little jet, in which I put small carbon fiber rods along the leading edge of the wing and edges of the foamboard body on top and bottom. I want the plane to have flex on impact which adds to its durability. I would not use fiberglass in this case. I have other models, such as the Hobbyking Tuff Trainer, which had a very flopsy wing and because I wanted to make it perform snap 3d maneuvers, I wanted a very rigid wing. I put six layers on the leading edge of this wing in 1.5" wide strips that went the length of the wing. The strips were applied with 3/4" above and 3/4" below the leading edge and the cured fiberglass front edge not only gave a very light and strong spar effect to the wing, but also made the wing very damage resistant. I ran the wing into tree branches and posts, for example, and the most it suffered was some cracked fiberglass, which I corrected with a small section of some more fiberglass over top of the damage. You never loose a chunk of wing again and again, fiberglass, when done with only enough resin between each layer to saturate through the next layer (and no more), the end product is very, very light. Almost as light as carbon fiber and almost as strong and a heck of a lot cheaper. Also, fiberglass will conform to any shape, unlike carbon fiber, which has to be fit into an existing shape.