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Abstract
Full-scale whirl impact tests simulating tree strikes and low-velocity wrench drop tests have been conducted on a full-scale graphite/glass-epoxy 11 ft dia. two-bladed tail rotor. Damage following whirl impact of 1 2 in and 1 in dia. hard maple wood dowels and a 1 1 4 in dia. maple tree branch was limited to the trip cap and tip balance weight retention bolts and was not sufficient to cause a mission abort. Low-velocity impact tests were performed by dropping a 1·6 lb wrench and a 1·9 lb steel projectile from a height of 12 ft on to various areas of the blade. The construction of the blade, which completely encases the graphite-epoxy spar with a glass-epoxy torque tube and aerodynamic shell, proved to be relatively invulnerable to this type of hazard.
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