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HomeAircraftHelicopterHIROBOOther › freya one way bearing
11-03-2004 09:41 PM  13 years agoPost 1
rcadd1ct

rrElite Veteran

Richardson, Texas

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Well I am replacing my one way bearing again.

So I do a search on the Internet to find a cheaper replacement.

I find Boca has them but the price difference is not that much. I will support my LHS instead.

But what I did find that was interesting was the torque these bearings are rated for. Get this! A whopping 12.2 INCH pounds.

That's it. A littler over a foot pound.

No wonder I am blowing these things out with my OS 91 PS.

Funny how technology advances and then you find the next weak link in a system.

At least I am not having to replace the clutch all the time like on my first raptor.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-03-2004 09:43 PM  13 years agoPost 2
I3DM

rrProfessor

Israel

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Just do Augusto's grease mod and be done with replacing those !!

http://runryder.com/t55473p1/

i thought everybody knew about it already...

www.liorzahavi.com

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11-03-2004 10:01 PM  13 years agoPost 3
rcadd1ct

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Richardson, Texas

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Been there, done that.

Got the grease all over the place replacing the bearing.

I am wondering if I have a bad metal hub.

Do the hubs wear out?

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-03-2004 10:05 PM  13 years agoPost 4
I3DM

rrProfessor

Israel

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No they dont. make sure you pack it real well with Triflow and it should last for a long time, this is from expirience - not an estimate.

www.liorzahavi.com

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11-03-2004 10:08 PM  13 years agoPost 5
rcadd1ct

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Richardson, Texas

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That's what I did this time and before.

I must be going through an unlucky phase.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-03-2004 10:08 PM  13 years agoPost 6
mrNoodles

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Borlänge, Sweden

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Same here...

Im on the third one since getting the XSpec in August...

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11-03-2004 10:12 PM  13 years agoPost 7
I3DM

rrProfessor

Israel

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im using white Triflow, which grease are you guys using ?

oh and believe me, i bang the collective (torque!) of that machine pretty hard !

www.liorzahavi.com

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11-03-2004 10:19 PM  13 years agoPost 8
mrNoodles

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Borlänge, Sweden

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Klüber
Paraliq GA343

Got like 5 microfractures in the latest bearing.
Heard the engine cough last time I was out flying, tried with some tictocing, couldnt make the bearing let go, pirofliping does...

The hub is filled with grease every time I remove the cracked bearing.

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11-03-2004 11:00 PM  13 years agoPost 9
rcadd1ct

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Richardson, Texas

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I did not radius the hub's edges.

I did pack the hub with grease.

Is it posible it is not the grease but the radiused edges that is Augusto's fix.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-03-2004 11:38 PM  13 years agoPost 10
4cyclic

rrKey Veteran

Montreal, Can. and northern Vermont

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I had the same problems. Then i reread Augusto's thread.
Try enlarging the hub a few thousand's on a lathe so the one-way bearing has actually room to move sideways a little. This is what is needed to have the needles lock up in unison. If one needle locks before the other, the spring retaining it will fatigue and the bearing will make your engine sound like it has hiccups.
at first i did file the edges and put triflow grease, so bearing was a nice push fit. the problem is the bearing torques the hub edges and the bearing get tight again after 30-50 flights. If the bearing is tite, then grease won't help.

Seems tic-tocs are hard on bearings and some flyers never have a problem, so flying style is a factor, IMHO.

Jeff Greene indicated Hirobo were working on getting the thing bulletproof.

J.L.

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11-03-2004 11:41 PM  13 years agoPost 11
rcadd1ct

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Richardson, Texas

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Ya know, I really need to start rereading my posts before I hit send.

It really sounds like I am mad. I am not mad/irked/po'd................whatever.

I posted not to stir up anything. I was just surprised at the low torque that these bearings are rated for. And to see if I was the only one still having issues.

Original post edited since I did not intend to be a negative person.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-04-2004 12:38 AM  13 years agoPost 12
TMoore

rrMaster

Cookeville, TN

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The bearing that comes in the Futura SE is just that, bullet proof. The early Futura Golds had this problem too. They would lock up and then after a while the retainer would crack. The Futura SE one way is solid 52100 ball bearing steel with a steel retainer.

So far my Freya hasn't had this problem but I'm not hammering the machine on every flight. I still have a spare just in case.

Augusto's mod has some merit but I think that the grease just facilitates the float that the bearing needs to center up. Taking a grand out of the bore is a help. I did this in mine from day one.

Terry

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11-04-2004 01:06 AM  13 years agoPost 13
I3DM

rrProfessor

Israel

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Hey Terry,

is that 0.001" off the hub ? i.e 0.001" at every point that the hub touches the bearing case ?

www.liorzahavi.com

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11-04-2004 02:01 AM  13 years agoPost 14
TMoore

rrMaster

Cookeville, TN

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Lior,

I chucked the hub in a 4 jaw chuck, dialed the hub in and skimmed .001-.002" out of the hub ID.

Terry

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11-04-2004 03:43 PM  13 years agoPost 15
mrNoodles

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Borlänge, Sweden

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I did sand the edges some more when inserting the new bearing, might do the trick.

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11-04-2004 04:11 PM  13 years agoPost 16
rcadd1ct

rrElite Veteran

Richardson, Texas

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Looks like I may need to take off the sharp edges.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-04-2004 04:15 PM  13 years agoPost 17
vols77

rrApprentice

Hills of Tennessee

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When I first installed my one way bearing it was a very tight fit in the hub.

After reading Augusto's post I noticed that he said his bearing would just fall out of the hub.

Now mine was almost a press fit and very tight and I don't have a lathe to do machine work so I just used sandpaper to enlarge the inside diameter of the hub and now mine one way bearing will fall out of the hub.

I think this is the most important step to do so the one way bearing has room to move and lock up correctly.

So far I haven't had a problem but I don't fly as hard as some of you all.


Rick

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11-04-2004 04:58 PM  13 years agoPost 18
KMorgan

rrApprentice

Bonnie Scotland

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Ditto vols77

Used some wet & dry round a finger until the hub could fall out under its own weight. One year later, no probs so far.

K

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11-04-2004 05:14 PM  13 years agoPost 19
mrNoodles

rrProfessor

Borlänge, Sweden

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Hmm Im quite sure that my oneway can fall straight thru the hub also, might have better luck this time.

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