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"The next time someone sneers at a wooden sailplane, remind them that it is
made of a unidirectional reinforced laminated composite material consisting of micro-tubular fibres embedded in a long chain polymer matrix and having a near infinite fatigue life." -Unknown- The wooden rotor blades on a Bell 47 helicopter (i.e. MASH) were "on condition" where as the metal blades are life time limited. |
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