An example of high-end homebuilt design is Lancair , which has developed a number of high-performance kits. The two primary types of composite planes are moulded composite, where major structures like wing skins and fuselage halves are prepared and cured in moulds, and mouldless, where shapes are carved out of foam and then covered with fiberglass or carbon fiber. This allows the company which sells the kit to avoid the long and expensive process of certification, because they remain owner-built according to the regulations. The resulting federal standards on design, engineering, stress analysis, use of aircraft-quality hardware and testing of aircraft brought an end to amateur building except in some specialized areas, such as racing. Drawbacks include the need to work with chemical products as well as low strength in directions perpendicular to fiber. Fabric-covered wood or metal frames and plywood are common in the aircraft structure, but increasingly, fiberglass and other composites as well as full aluminum construction techniques are being used, techniques first pioneered by Hugo Junkers as far back as the late World War I era.
Unlike the wood construction techniques used in other applications, virtually all wooden joints in aircraft are simple butt joints , with plywood gussets. We might see more motorglider-type homebuilts, tied both to high fuel prices and emerging electric-propulsion technology. Plus, with demographic changes, there is possibly a diminishing interest in, or ability to undertake, aircraft building as a pastime.
Burt Rutan introduced the canard design to the homebuilding world and pioneered the use of composite construction.
Retrieved from " https: Homebuilt aircraft are generally small, one to four-seat sportsplanes which employ simple methods of construction. Many of these were prototypes, but designs such as Bernard Pietenpol 's first design were some of the first homebuilt aircraft. Material stiffness dependent upon direction as opposed to equal in all directions, as with metals allows for advanced "elastic tailoring" of composite parts. Second Edition , pages Without the regulatory restrictions faced by production aircraft manufacturers, homebuilders introduced innovative designs and construction techniques.