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Rotory helos

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  1. Hello, iam analysing failure of coupling shaft. Iam exactly not able to make out whether it is a failure due to overheating, loss of lubricant or when my tail rotor hit the ground resultantly its impact load caused it. However, i didnot think it is due to sudden impact load. One more thing if OEM is recommending G355 grease in that coupling and iam using G353, Does it affects or not. Picture of failed coupling is attached. This is the other end. Here you can see teeths of coupling are damaged/wear in a specific regular pattern. Only area of approx 5mm is damaged in this coupling and on the oth
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