A rig is described for the fatigue testing of a full‐scale main rotor hub. The load paths within the rig are compact, direct, and self‐reacting. As a consequence, the rig is small and portable. Its main framework is an open pyramid that is constructed of welded steel plates
and rolled sections. The rig is capable of applying significant loads. In current tests of a full‐scale rotor hub, the loadings include: centrifugal force = 102,000 lbs; torque = 426,000 in.‐lbs; lift = 16,100 lbs; and hub moment = ±265,000
in.‐lbs. The loads are generated by hydraulic cylinders. The equipment for controlling, measuring, and recording loads is described. In general, such equipment is not dedicated solely to hub testing, but rather is transferable to other projects when not in use for hub testing. It is
concluded that the new rig offers a practical, inexpensive method for the fatigue testing of full‐scale rotor hubs.
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Document Type: Research Article
Kaman Aerospace Corporation, Bloomfield, Conn.
Publication date: 1987-04-01
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