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HelicopterHIROBOOther › Freya Evo- auto bearing failed
10-05-2005 01:25 PM  12 years agoPost 21
mrNoodles

rrProfessor

Borlänge, Sweden

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Jdonovan
New or old style bearing?
I would like to try a new style bearing but it seems like they breaks as easily.

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10-06-2005 02:56 AM  12 years agoPost 22
Jdonovan

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Louisville, Ky

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No, I did not but i will try the mod with the new one, It was the new bearing.

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11-09-2005 03:20 AM  12 years agoPost 23
playfair

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Rochester, NY

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My Evo 50 one-way failed today (flight 135), just as the bird was flipping back upright. Fortunately I remembered skimming this topic here prior to ripping out my hair searching for a broken clutch! Upon disassembly, I'm greeted by the infamous crack in the outer bearing case.

I read up on the grease mod, and can see how it relieves some of the strain on the bearing case. Got me thinking... I don't know how much the plastic piece costs that the bearing slips into, but instead of grease, could it be "packed" with JB weld? This would prevent ANY movement of the one way (once located) so it couldn't expand to crack. My Raptor got over 700 flights on it before the one way started locking up, but this "giving out" thing is a more severe problem!

Just looking for any reasons not to do it...
If there are, will thick silicone grease work for the mod?

TIA


The sky is our canvas

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11-09-2005 03:22 AM  12 years agoPost 24
spritefiend

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Camarillo, CA

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playfair

but instead of grease, could it be "packed" with JB weld?
im pretty sure ive read of this being done, let me take a look see if i can find it.

edit: i knew i had.

http://runryder.com/helicopter/t101522p1/

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11-09-2005 05:11 AM  12 years agoPost 25
jkelly

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Bedford, PA

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The only problem with that is the alignment. If it dries out of alignment then it will probably fail sooner. I haven't read the grease trick in a long time but I believe that is part of the problem. I guess if you dynamically dried it maybe it would help, dunno. I think perhaps a sleve should be pressed over the existing case to thicken the wall or shorter dual pin, over and under instead of single pins might work.

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11-09-2005 06:05 AM  12 years agoPost 26
j911brick

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Republic of Texas

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Why not just make an aluminum hub? I would do if I didn't have so many other projects on the shelf.

james

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11-09-2005 01:55 PM  12 years agoPost 27
playfair

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Rochester, NY

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Thanks, spritefiend!
Just what I needed to hear.

Jkelly, the alignment is already done with the "fingers" which resemble a 12pt socket head. The JB is to simply give the bearing more support.


The sky is our canvas

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12-12-2005 12:19 AM  11 years agoPost 28
Scooterpilot

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Southern, California

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One Way Bearing Failure

I was doing a tail slide take off and can you guess when the one way bearing decided to fail. Yep, when I went inverted. Got my undivided attention.

It cracked down the steel outer side lengthwise.

Luckly for me I had an old one bearing that I swapped out @ the field.

Does anyone know if the new oneway bearings are available?

Regards

Scooterpilot

Team Thunder Tiger, Team Futaba, Two G-4's, Two X50's YS60SR,Tx12Z/14FG,YSRep,RailBlades/S

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12-12-2005 12:36 AM  11 years agoPost 29
Defiant

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usa

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Does anyone know if the new oneway bearings are available?
Part # 2500-102
http://www.ronlund.com/Merchant2/me...ct_Code=2500102

I had a One-way go out on my X-Spec a few weeks ago........
it was about 10 months old....

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12-12-2005 03:55 PM  11 years agoPost 30
Garry-Boy

rrKey Veteran

Moscow, Russia

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I was doing a tail slide take off and can you guess when the one way bearing decided to fail.
If you fly like this than it supposed to break sooner or later, can you imagine what force are pushed on little poor one way bearing.
According to my experience, the breaking of the bearing when you done the mod is a question of: 50% your flying style and 50% your luck.
The bearing might sits different; once it sits wrong it may cracks each 10gals, while when it sits right it way lasts for months...

Garry.

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12-12-2005 05:32 PM  11 years agoPost 31
JKos

rrProfessor

Redondo Beach, CA

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Of all the things Hirobo does right and with high quality, why in the world can't they get the auto bearing right? I sure don't hear about this being an issue on other platforms.

- John

RR rules!

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12-12-2005 08:17 PM  11 years agoPost 32
u.k. sailor

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cambs uk

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I guess you dont look at the TT posts then?

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12-12-2005 08:41 PM  11 years agoPost 33
JKos

rrProfessor

Redondo Beach, CA

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> I guess you dont look at the TT posts then?

What's TT? Just kidding. No, I don't pay attention to TT stuff so you would be correct. I was thinking of other brands which I group quality wise with Hirobo.

- John

RR rules!

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12-12-2005 10:22 PM  11 years agoPost 34
spritefiend

rrKey Veteran

Camarillo, CA

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Of all the things Hirobo does right and with high quality, why in the world can't they get the auto bearing right?
i think they could improve on their plastic radius block and slide and ditch that muffler they stick in some kits. only since your brought it up

u.k. sailor: ive seen those posts, aparently that was resolved with the latest QUK though wasnt it?

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12-12-2005 10:34 PM  11 years agoPost 35
mrNoodles

rrProfessor

Borlänge, Sweden

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TT doenst seem to have solved either way
(QUK did)

But I agree, a decent Hirobo oneway would be useful/needed.

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12-13-2005 12:11 AM  11 years agoPost 36
racingstripe

rrVeteran

Sacramento, CA

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Hirobo really should incorporate a sprag type one-way.

GMN out of Germany has a 15x23 sprag that has a torque capacity of 40.6 ft/lbs. (55 Nm).

datasheet

OS claims the new 91SZ-H produces 1.155 ft/lbs. of torque (1.157 Nm). Multiply that by 7.92, and you get the abuse figure the wimpy Koyo one way bearing is subjected to.

andy-

Proofread carefully to see if you any words out.

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HelicopterHIROBOOther › Freya Evo- auto bearing failed
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