For the crowd who have not yet made a study of words with multiple meanings.
bear: to carry, or support, a verb
bearing: carrying, the act of, a gerund
bearing: a direction, a heading
bearing: a surface made to reduce the friction of discrepant motion, a noun
As: roller, needle, ball, friction, etc. Also defined by type of action: as in Thrust.
Unless there have been leaps made in the pursuit of frictionless propulsion, some sort of element exists to suspend a rotating mass in the TRENT. Likewise, to provide a mass against which Newton's third force may impinge, to create THRUST, a face of stationery Metal must be provided.
Too many bearings? Not if one considers the need for each one.
Pictures, Diagrams, Schematics. Excellent to have a picture to refer to in the discussion, I have no talent with computers; this may explain why I use too many words. Some form of compensation, I suppose. I'll work on it.
on we go, then. (NOT Titanium, I so stipulate!! The picture is acceptable)
bearfoil