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Motorized glider12/28/2023 The adhesive is amply influenced and always much tougher than the adherents. Any water content in the wood influences the strength of the wood. If any failure occurs, wood is torn apart by the glue layer, or the glue layer tears a ply out of the plywood. Effective bonding examples are the wooden Ka 6 series of gliders which are mostly resorcinol formaldehyde bonded. Industry proposed in 1946 an adhesive that is practically resistant to boiling water, the resorcinol formaldehyde glue. A distinct odor warned them of aging, thus dangerous, glue. Glider technicians who built in wood were aware of the sensitivity of the older caesien glue to water and humidity. ![]() Van Rijn, in Comprehensive Composite Materials, 2000 6.13.3.10 Practical Aspects of Bonding Bigger Shells and Repairs 6.13.3.10.1 Influence of humidity 42 The use of carbon and aramid reinforced epoxy composites allows the construction of gliders of some 250 kg (551 lb), which with the substantially lower specific gravity of carbon fibres when compared with glass fibres, offers the reductions in weight to increase crash protection and improve landing gear, etc. 25.0 m) wings of very high aspect ratios (38). a combination of epoxy/carbon/aramid sandwich) has been employed in gliders is in the development of high performance competitive gliders with long ( ca. The usual resin of choice for constructions of this type is the vinyl ester but one example in which advanced composites (i.e. The choice of glass fibre reinforced plastic (GFRP) is prompted by the fine control over the shape of the components that can be achieved (particularly in the hands of the amateur builder), while the external skin is covered in ‘gel coat’ a polymeric coating that can be rubbed down with fine glass paper to control the shape following construction or repair and yield a high gloss, aerodynamic finish. Gliders (both in their powered and unpowered forms) constitute a very small sector of the industry and may be constructed from several materials: older craft utilise wood, wood and fabric, aluminium and steel (the latter in the form of a tubular framework), while modern examples are almost always constructed from composite (both glass fibre and/or carbon fibre reinforced) and the technology has been in use for some 30 years or more. Mooring, in Thermosets, 2012 7.4.4 The use of thermosets in recreational and competition aircraft
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