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Investigation shows quill-shaft failure due to bearing wear in VTOL aircraft fans, suggesting current design is adequate.
The failure of a quill-shaft in a fan-in-wing model was investigated. After examination of the available evidence it was concluded that the quill-shaft failure was caused by excessive wear on the inboard pinion bearing, resulting in mal-alignment and large bending stresses in the quill-shaft splines. No design changes are considered necessary at this time.
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Levy et al. (1968) studied this question.
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