Long or crossbow frame - reinforced with parallel longitudinal carbon fibres pref in synthetic resin

摘要

The carbon fibres have a tensile strength of >=84.4 kg/mm2 and a modulus of elasticity of >=14060 kg/mm2. Pref. the longitudinal core of the frame is of wood and/or glassfibre-reinforced synthetic resin with a carbon fibre-reinforced synthetic resin outer skin and the layers combined with a urea-formaldehyde or epoxy resin adhesive.