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Old Jul 14, 2006, 09:03 PM
F5B, helis...too much
Fairfax, VA
Joined Mar 2002
370 Posts
Question
Thrust bearing in Raptor 50 V2 blade grips

Am assembling the thrust bearing, washer, collar, bearing, etc in the blade grips.

For installation of the thrust bearing, instructions say to position the bearing washer with the smaller inner hole toward the blade and to position the bearing washer with the larger inner hole toward the head.

I can't tell which bearing washer inner hole is smaller or larger. They both look the same.

Between the bearing washers there is a middle ring that holds the steel balls. One side of the ring is the open side. Is the open side the side against the bearing washer with the smaller or larger inner hole?
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Old Jul 14, 2006, 09:46 PM
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cadmonkey's Avatar
Maumee, Ohio
Joined Sep 2005
773 Posts
Bearing race shouldn't matter for direction. To discern which of the bearing surfaces has the smaller ID, put them both on the shaft and one will tip to the side more than the other - this is the larger (outer) bearing washer.
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Old Jul 14, 2006, 10:30 PM
Registered User
USA, CT, Farmington
Joined Nov 2003
887 Posts
Most heli pilots install the open side of the bearing facing toward the main shaft ot help retain the grease in the bearing. Do as cadmonkey suggests for the inner and outer races. Use the spindle to determine the ID of the races, the larger ID will slide easily on the spindle compaired to the smaller ID.
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Old Jul 14, 2006, 11:12 PM
F5B, helis...too much
Fairfax, VA
Joined Mar 2002
370 Posts
Didn't think about doing it that way on the spindle. It works.

Looks like the open side of the middle ring faces the larger inner hole washer, which should face the head.

What kind of grease do you use? White lithium? Car ball joint grease?

thanks,
tufnik
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