To: Genghis
The constant velocity joint used in the Sikorsky S 51 tail rotor drive system was repackaged in a stainless steel container but the insides came off of a US Army 6 X 6 truck. The US Army ordered 1000s of bearings that were not aircraft standard and installed them in the tail rotor drive shafts of Sikorsky H-19s. The correct bearings had the same federal stock number of a bearing used on army vehicles. Needless to say, they didn’t hold up very long.
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The Cat
[This message has been edited by Lu Zuckerman (edited 06 March 2001).]