FLEXTURE WOOD FULL
First, trace the shape for the proposed lamination on the bench full size. This raised up jig also makes it easier to center the clamps along the length of the lamination. The small blocks raise your laminating work up off the workbench so that the squeezed out glue has some place to go without sticking the whole works to the workbench. I like to use the blocked-up type of jig ( Figure 1) for laminating bulkhead rings, frames, wing tips and similar parts. This sliding action, while of no concern with most other glues, will tend to destroy integrity of the glue line already setting up in the Aerolite. When assembling a bent lamination, the strips tend to slide as the clamping and bending proceeds. It is a good two part glue system but it requires extremely fast work because it "grabs" immediately when the two surfaces are joined. I would not use, or attempt to use, Aerolite glue for laminating work. This is, however, nothing to worry about unless you intend to have your airplane double as a submarine, too. Plastic resin isn't bad either, but it is classified as water resistant and not, technically, waterproof. In this respect, recorcinol is an excellent glue for laminating. Use a glue that will allow you a reasonable length of work time before you have to close and clamp the bundle. They also perform well in high temperatures.
In the category of preferred glues for fabricating laminated bends, we have the urea formaldehyde adhesives (resistant to moisture) and the phenolics or recorcinols considered to be waterproof and known for their strength and longevity. However, without researching specifications and data for various glues it would be better to stay with one of the proven glues used in aircraft construction.
There are many glues that can be used for laminating wood parts. But worth considering too is the fact that the more lamination layers used (due to thinner strips, for example) the greater the amount of glue and wood that will be required to complete the lamination.
On the other hand, such a lamination (two or three layers) will also have a greater degree of "spring back" than one made of many layers. lamination layers, the easier the layup will be. If you find that single strip hard to bend around the required bending form, think how much harder it will be to bend the total number of strips, making up the lamination, at the same time. Essentially, you should select a single strip thickness that allows it to be easily flexed around the required bend without fracturing (see Table). The thickness of the individual wood strips to be used in a lamination is governed by the degree of curvature (radius) to which the lamination must be fabricated. A laminated wood part, on the other hand, is a glued piece consisting of multiple thin layers of wood with the grain of all the adjacent layers running approximately parallel. Plywood is a glued up sandwich consisting of three (or more) veneer layers in which the grain of the center layer is oriented approximately 90 degrees to that of the two outside layers. A laminated wood component is a marvel of lightness and strength and it will conform to the required shape better than a similar bend made in a solid wood piece.īent aircraft structural components such as frames, bulkheads, longerons, control surface trailing edges, wing tip bows and windshield bows, when made of wood, are almost always laminated because solid wood pieces are difficult to bend.Ī laminated wood part is much like a plywood part with this shade of difference.
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