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Old 02-27-2018, 05:42 PM   #3 (permalink)
Atomic Skull
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Join Date: Dec 2011

With tail rotors that have a solid hub they have to design in some slop in order to accommodate tolerance variance in the bearing and the hub and grips. If they made the fit between the bearings grips and hub all a exact a certain percentage of the tail grip sets would lock up when the screws are tightened because in the real world these components are never all exactly the same dimensions.

With tail rotors that have a spindle and dampers like the SAB goblins and the Logo 600 you can get rid of the slop because the flexible dampers allow for some preload on the bearings without overloading them. Another way to address this is how JR designed their solid tail hubs with a rubber O-ring between the hub and the grip to take up the slop.
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