ARROW SHAFT HAVING A TWO-STAGE SPINE STRUCTURE, CAPABLE OF OPTIMIZING FLIGHT PERFORMANCE SUCH AS FLIGHT STABILITY AND STRAIGHTNESS

摘要

PURPOSE: An arrow shaft having a two-stage spine structure is provided to be prevented from being split by dividing it into two parts and laminating a carbon fiber sheet having different physical properties on each part.;CONSTITUTION: An arrow shaft having a two-stage spine structure includes an arrow shaft forming sheet (110). The arrow shaft forming sheet comprises a first sheet layer (111), a second sheet layer (112), and a third sheet layer (113). Carbon fibers (CF) of the first sheet layer are arranged in parallel in the specific direction and cover a front part (I) and a rear part (II). The second sheet layer is connected to be attached to the lower end of the first sheet layer. Carbon fibers of the second sheet layer are arranged in parallel in the other direction. The third sheet layer is attached to the lower end of the second sheet layer. The third sheet layer is formed to connect a front sheet (113a) and a rear sheet (113b). The front sheet is made of carbon fiber sheets covering the front part. The rear sheet covers the rear part and is made of carbon fiber sheets of which the elastic stiffness is greater than the front sheet.;COPYRIGHT KIPO 2013