| 摘要 |
A flexbeam (1) having flapping portions (3) and lead-lag and feathering portions (5). Each lead-lag and feathering portion has: a central portion with an elongated and narrow width; middle portions each of which continuously connects to the central portion and branches from both ends of the central portion extending along the longitudinal direction thereof, and extends upward and downward; and edge portions each of which continuously connects to the middle portion and bends from each end of the middle portions and extends almost in parallel with the central portion. At corners formed on branch portions (40, 50) and/or bending portions (60, 70), concaves (41-43, 51-53, 61, 62, 71, 72) each of which has a cross-section of an approximate arc shape and which continuously and smoothly connects to two surfaces forming each of the corners and is formed inside extended planes of the two surfaces.
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