one way bearing failure

[jujiro]

lol so it finally happened, the dreaded OWB failure i kept hearing about . I just started pushing the heli a bit harder with so FFF, circuits, flips Tic Tocs, pretty much at Full Throttle the whole time on a 16 t Pinion with the z20 980.

Was pretty punchy with that setup even if my flight time went to hell. Although I was lucky since it landed and everything completely fine, it wasn't until my next spool up that it decided to fail which is good since I'm sure I would have crashed if it happened in the air @_@.

ohh well I had already purchased the 20 T OWB and it should be in tomorrow hopefully ~~

[jujiro]

Btw does the problem with the owb go away after installing the 20 T ? I read somewhere that it still splits and goes bad even then ? If that's so I might just go with another Heli instead .

[Mikej]

I haven't heard of anyone having a problem with a 20T - I had over 70 flights on my H550 before I replaced the OWB with a 20T as a precaution.

[xodarap1]

I've got over 130 flights on the 20T now with the z20 hurri and it is holding fine.

I have one of the newer 19T's on the z30 hurri and it has been fine for 90 flights with the last 30 or so flights pumping some tic tocs and it is still holding like new. I've actually been trying to make it slip, crack or fail but it is still running strong. I don't know what they did to the 19T owb's, but this one isn't crapping out like my first one did! It might just be a lucky bearing.. but also might be a better one. I have no way to test/tell except to keep romping on it lol.
Is there anyone else out there that has one of the newer 19T owb's still going strong and pushing hard on a z30 heli?
The only thing that i've done differently was made my throttle curves smoother so there wasn't so much gear lash when going from normal to s1 to s2 modes. Before I was jumping from like 57% in normal to 78% in s1 and then 90% in s2. Now my mode jumps at a hover are at 60% normal, 66% s1 and 75% s2. The transitions are much smoother and perhaps less of a snap on the owb?

[worldofmaya]

I had that failure too... in-flight... but was no problem bringing my Hurri down. Autoroto makes much more fun than with one of those little helis. My 19T owb was working fine for 60 flights. No problem with an 20T so far...
-klaus

[jujiro]

lol even though I started doing tic tocs rolls and loops i never learned autos yet lol . The place I fly in has to many trees and I'm afraid of coming down without the aid of power ;p

Just got the 20T in today and test flew it on the z20 seemed to add a let more performance to it .

[worldofmaya]

You'll get a few more RPMs...
-klaus

[skigolfmike]

Going from the 19T OWB to the 20T OWB is approximately like adding a tooth to the motor pinion.

[BL]

I have my 19T OWB with Z30A for more than 100 flights, I did full pitch climbout and tic toc., still running strong.

Added: with 550mm CF blades.

[helvetic]

I got the owb failure (or at least I think it was...) yesterday. Did some tic tocs and then the motor screamed, no more power. I auto'ed and could land safely. Engine still running, but no load on the blades. Took her to the place, checked everything.... I cannot find the failure!
1. pinion cannot turn on the Z30 (grinded shaft)
2. front gear rock solid on the shaft, cannot turn either. (2 wrinkles on the shaft)

Today, same setup, she can spool up, no problem. But no flying of course, till I find the problem.


So, i took the one-way out, but it is strong as well! I don't know what happened in the air.
I tested the one way using a lot of power, but it is strong.
Is it possible that the one way may slip on the shaft?

I have Z30
15T pinion 50T front gear

[mjdee14]

Is it possible that the one way may slip on the shaft?

I have Z30
15T pinion 50T front gear

I have had the bearings hang up on another brand of heli...and slip....I'm sure with enough torque (Z30) it could happen....they are usually just roller embedded in a plastic cage that forces it up against the shaft.....wear or dirt could keep it from operating. just make sure the whoe bearing isn't slipping inside the gear itself.... The OWB is one of the more sensitive parts of any geartrain....but oh so important.

[kahn10]

hey bro......yeah thats your one way going.each one of the needle rollers is contained in a slot within the plastic cage thats almost twice as wide as the roller with two little plastic arms spring loading it so when it turns one way they lock against the shaft when they turn the other direction they spread outwides and release.utilizing their patented hahaha technology TM they developed a owb which appears to have nothing wrong with it while being completely rooted.you can take it to pieces ten times then replace it or replace it......

[Mark A Smith]

Hey Juro.I've got appx 10 flights with the new 20t OWB and so far it is working perfect
Gives me a little more head speed to boot! Swap it and and keep flying the Hurri !!

Mark Smith:thumbup: