Tail rotor bearings 'wobbly'

Tail rotor bearings 'wobbly'

Post by Grandmaster Bon » Fri, 09 Jun 2000 04:00:00



Greetings,
               I'm wondering how much 'play' there should be in the tail
rotor bearings of my Ergo50 Type2.  Specifically, these are the bearings
that the rotor grips are attached to.  I am able to grab my tail rotor
blades and wobble the tips from side to side.....approx 3~4mm!  When I
remove the bearings, the play appears to be mostly between the inner and
outer races of the bearing, with a tiny amount of play between the inner
race and the shaft they go onto.  Surely this is not normal??  I don't
recall having this much play in the tail blades when I first built the heli,
but then I didn't have a clue what I was looking at back then.  I would have
thought that the tail should also have thrust bearings, like the head
does......

When I got my 9250 tail servo recently, I was able to run 55% gain in HH
mode with no wagging, even in FFF.  Now I'm down to 50% and about to go
lower still because the wag is back during hovering.  It's a high speed wag,
not like the one I was getting when I had the shit tail servo.  I can only
assume that it's the play in the bearings.  I've been told that I should get
a JR60325 tail box and JR60340 pitch yoke setup, coupled with the K&S757
tail rotor grips, K&S396 tail pitch control lever and K&S782 tail pitch
control links with bearings.  Holy $$ batman!  Do I really need all this
stuff to get rid of the play in the tail?

Thanks,
MrBonk
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Tail rotor bearings 'wobbly'

Post by Timothy Morri » Sun, 11 Jun 2000 04:00:00


Which gyro are you using?

Tim.


Quote:
> Greetings,
>                I'm wondering how much 'play' there should be in the tail
> rotor bearings of my Ergo50 Type2.  Specifically, these are the bearings
> that the rotor grips are attached to.  I am able to grab my tail rotor
> blades and wobble the tips from side to side.....approx 3~4mm!  When I
> remove the bearings, the play appears to be mostly between the inner and
> outer races of the bearing, with a tiny amount of play between the inner
> race and the shaft they go onto.  Surely this is not normal??  I don't
> recall having this much play in the tail blades when I first built the
heli,
> but then I didn't have a clue what I was looking at back then.  I would
have
> thought that the tail should also have thrust bearings, like the head
> does......