R50 rotor head assembly

[RotorBlade]

Guys - just rebuilding my 50 after a recent unplanned, heavy landing (shall we say).

Just noticed the manual diagram shows the blade grip assembly working from the dampner outwards as....

washer - bearing - thrust bearing - washer - bearing - washer + bolt.

This goes against anything I've done before (including this 50) where the two bearings sit in the blade grip itself and then the thrust washer, followed by the bolt.
That's also how my 90 is and in the 90 manual too.

Is this just an error in the manual for the 50?

Any help much appreciated.

[hellraiser]

Check out this link, this shows the correct assembly for blade grip bearings & washers.

Raptor 30-50 Page 17

[RotorBlade]

Wow - that shows the same assembly as the manual.
Thanks for the link.
Seems odd that it's so different from the 90 head......
Unless the 90 head is wrong!

I should stress this is the Titan SE......

[hellraiser]

I have just checked out my Raptor 90 head and the bearing configuration is exactly the same as the R50.
The 1st sealed bearing goes into one end of the blade grip (closest to feathering spindle), then working from the other end, thrust bearing (3 pieces) thrust washer, sealed bearing, and finally small washer under feathering spindle bolt.
It doesn't make any difference SE or Std, metal or plastic, the bearings all go in the same way, so in what way is this different from the 90 you have.

[RotorBlade]

Ok - I'm still kind of confused after your description above I'm sorry:-(
The link you kindly posted gives the configuration as follows - working outwards from the dampner to the blade:

washer - sealed bearing - 3 part thrust bearing - thrust collar (washer) - sealed bearing - washer - bolt.

I bought the 50 second hand and when I worked on the head after a bo-bo in November, it came apart as follows - going the same way as above;

washer - sealed bearing - sealed bearing - thrust collar - 3 part thrust bearing - washer - bolt.

My 90 manual is here:

http://www.heliproz.com/images/Raptor90SEManual.pdf

If you check page 25, that shows to fit the grips as per 'my way' - not the way the link says or for that matter, the 50 manual.
That's why I'm confused.

Thanks for the help - much appreciated. I don't want to get it wrong, though it flew ok with the 'wrong configuration' as I put it back together the way it came out - ie with the thrust bearing closest to the blade. It is currently re-assembled with the R50 manual method (ie as per your link).
Cheers
Keith

[hellraiser]

Yes I see what you mean, I have always thought that the sealed bearing closest to the blade is correct as this supports the blade grip and stops it flapping, any flapping is then done through the dampers in the main head, although mine is std R90, I put the metal head on and followed the bearing config as per the manual, havent had any problems so far.
If was flying ok before the oops moment, I would put it back together the way it came apart.

[RotorBlade]

Cheers mate - I'll have a think about it and decide. Like I said, at the moment it's assembled as per the manual & I can see the sense in that, but equally, if it ain't broke......

(which obviously it was!)