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Fafnir bearing

Flying Ant

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Looking for a REPB3N-2 rod end bearing.

Anyone?
 

dcody

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Wicks aircraft has them. Why do our parts cost so much!


Item # REPB3N-2, Female Rod End Bearings
List Price $79.61 ( Quantity Discount Available )
 

PittsDriver68

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Aircraft Spruce has them also. Just bought some.

This particular rod end is a MIL-spec item. Probably many years ago they were inexpensive due to military contract overruns and left-overs. Curtis Pitts grabbed a lot of that stuff. But today the surplus times are over and the market is much smaller.

Good stuff but no longer cheap.

Best of luck,

Wes
 

jrs14855

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In the mid 70's there was a surplus warehouse near Warner Robbins GA that had almost all the bearings used in the S1S for around $1.50 each. New in individual sealed packages. Within 10 years most of that stuff was gone. The military mentality that resulted in so many surplus parts is quite interesting.
John Van Sant who ran Old Star Airport, then Doylestown Airport and finally built Van Sant Airport (all in PA) had a huge supply of new surplus Cessna L19 stuff. The PJ260 used a lot of L19 parts as well as a few parts from civilian Cessna's.
In that same era the discount price for a NEW 0 360A4A Lycoming was $4000.
I built my first S1S in that era for 10k with all new parts/material except for the engine which was a first run rebuild with a new crank and lots of new parts. The best running Lycoming I ever had.
 

Neil

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That particular rod end is much more involved to manufacture than the typical rod end. Where the typical rod end has a spherical ball riding around in a couple of bronze seats pressed into a housing , the Fafnir rod end has 2 rows of ball bearings within it to provide an absolute minimum of friction when the ball rotates. This design is also somewhat limited in it's ability to operate in a misaligned situation. The link from the control stick to the first idler or anywhere twisting occurs is not a good application for this bearing.
 

cwilliamrose

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If your control system has enough of these cascaded together you can use them on the elevator pushrods and get full rotation of the torque tube. The Pitts S-2 doesn't have enough of these bearings to allow that much rotation because of the fixed idler just aft of the torque tube. The S-1 has the first idler mounted on the aft end of the torque tube itself and the second idler has a similar bearing as part of its design. These bearings have a +/- 10° misalignment spec so three of these together will allow for +/- 30° of rotation of left-right stick movement.
 

PittsDriver68

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The S-2C ran into a problem with the original rod ends having insufficient rotational freedom and the stick rod ends had to be replaced with different ones that have more rotational range. The replacement part uses SAE-AS81935/2 Aurora bearings. Probably just as expensive.

Best of luck,

Wes
 

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