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carbon can fail along a stress fracture from a previous impact.
This has lead to the development of the Croker stress testing machine to determine wether an oar is violable to race with. Originally used in manufacturing process this machine is now also used to test the strength, flexibility and durability of oars before big races especially after a clash in training. This machine determines wether there is a stress fracture then Croker staff can fix the fracture before the race. I am unsure of this being implemented in GPS racing but as previously stated it is used in the rowing community and I am sure the 8 Aussie boats going to Rotterdam will have their oars tested before they race. Regardless with some of the schools budgets it will soon filter down into GPS level anyways.