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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › OS 55 HYPER Bearing problems
10-28-2011 08:43 PM  6 years agoPost 1
Wedge77

rrVeteran

St. Charles Missouri USA

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After all the mess with the bearings going out on the 50 Hyper, which the reps at IRCHA told me year before last that THE bearing problem was fixed with the NEW 55 Hyper.. I have one now go out with less then a gallon of fuel through it. Anyone else having problems? No lean runs, no abuse, no 3D (running cool power30%) other then the bearing going out, you cant tell the engine has even been ran. with My hyper 50's OS wouldn't warranty a single one so wondering if they will slack on these as well? Really getting tired of these engines going when you pay close to 300.00 damned dollars for something.

Anyone else having bearing failures with OS AGAIN?

Really starting to get pissed off with OS Heli engines! I have OS plank engines that are 30 years old and run like a top.. am I just unlucky here?

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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10-28-2011 10:57 PM  6 years agoPost 2
dchekas

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Farmington, CT

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I've had great luck with my bearings in my OS55HZ. First went 9 gallons, and I only changed it because I had dropped the engine for another reason. It was still in good shape when I popped it out.

I store my heli indoors. I don't run the fuel out at the end of the tank, I just shut down and put it away. Using Rotor Rage 30%, and I've used CP 30% in the past.

No after run oil or anything.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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11-01-2011 02:59 PM  6 years agoPost 3
Richardmid1

rrProfessor

Leeds, England

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Heres what I do to make them last, stop the motor by shutting the fuel line not by cutting the motor from the TX, use an exhaust bung and shut the carb fully, refuel asap to push out all the harmful exhaust gasses, don't store in a warm house after flying in the cold with the engine still warm.

60% of the time, it works every time!

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11-01-2011 03:54 PM  6 years agoPost 4
rexxigpilot

rrProfessor

Florida

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Most of the OS bearing failures I've had and seen with others is due to rust. If you live in a humid environment you may want to go with SS bearings. And no matter where you live, you should purge the engine of fuel and exhaust immediately after use. The best way to do this is to close off the fuel line, open throttle (no glow) and hit it with the starter for a few seconds.

The other cause of bearing failure is from spalling. This is almost always a result of lean runs. Detonation will cause the pressure between the bearing and race to exceed the film strength capacity of the lubricant. When this happens, metal to metal contact occurs and the ball bearing or race will shed metal flakes. This is known as spalling. Run slightly on the rich side to avoid this.

The middle needle tuning is important here. I think many of the spall type bearing failures we see are due to being too lean in the midrange. Every time the heli goes from a highly loaded condition to a light load, it is running off the mid needle. The YS56 carb has the mid needle as the prominent one that you tune with fingers. The high and idle needles require tools. I don't think that was design mistake.

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11-01-2011 04:08 PM  6 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Ive read SS bearings should not be uses as they are softer and are more prone to pitting.

60% of the time, it works every time!

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11-01-2011 05:02 PM  6 years agoPost 6
rexxigpilot

rrProfessor

Florida

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That depends on the type of SS used. It is my understanding that the SS used in RC engine bearings is ANSI Type 440C. This has the about same Rockwell hardness of approx. 60 for the surface as chrome steel. The strength of 440C is also close (88%) to that of chrome steel. No bearing is designed for use without a significant factor of safety - likely at least 2 safety factor. So the slightly reduced strength should not be an issue.

Of course if you are running lean and detonating, no bearing can withstand that. Look for indications of spalling and Brinelling to see if this was the cause of bearing failure.

As I said before, in humid environments, go with the SS bearings. Otherwise, chrome steel is a better choice.

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11-01-2011 05:44 PM  6 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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Try Rotor Rage, I've had very few issues (none really) since switching.

Andy
AMA 77227
http://www.jaxrc.com

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11-01-2011 05:58 PM  6 years agoPost 8
jschenck

rrProfessor

La Vista, NE.

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Personally I also run the starter on my engine for a few seconds with the carb wide open to purge fumes at the end of the day. Then close it off and plug the exhaust to keep the engine from breathing in storage - keeps the rust down. Don't store it in a place where the temp changes a lot (garage) if you can help it. Filling the tank before storing makes the fuel lines last much longer.

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11-01-2011 07:58 PM  6 years agoPost 9
Gearhead

rrMaster

Vt

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Wedge77,, I'm just wondering,, is the Stock rear Bearing a SKF Brand ??

1) I ask because SKF is what OS shown when the 55 was released,,

2) I put a SKF in my Hyper 50 and it sure didn't rust like the Stock Unbranded Bearing..

Jim
Buzz Buzz Buzz

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11-01-2011 07:59 PM  6 years agoPost 10
Wedge77

rrVeteran

St. Charles Missouri USA

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Well, Im going to send engine back to OS for warranty and see what they do. Im hoping they replace the parts needed to get this engine back up and running. I do live in Missouri where it is humid, however. there was no rust in this engine whatsoever... so we'll see what happens. I've always drained my tanks and if they are going to sit more then a week, (usual;ly only in the winter) I turn them over to get fuel out of the system.
so anyways.,. I bought a YS50St.. see how that works LOL

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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11-01-2011 08:41 PM  6 years agoPost 11
Richardmid1

rrProfessor

Leeds, England

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YS's still have bearing problems but OS are more popular which is why you hear of more OS bearing failures, same reason you hear more about Align motor bearings, CC esc's failing etc etc.

60% of the time, it works every time!

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11-01-2011 09:10 PM  6 years agoPost 12
rexxigpilot

rrProfessor

Florida

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Yep, I believe the OS and YS 50's use the same bearings.

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11-01-2011 09:17 PM  6 years agoPost 13
jschenck

rrProfessor

La Vista, NE.

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And so do Thunder Tiger engines - many engines in this case size use the same bearing size, in the airplane engines also.

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11-02-2011 11:57 PM  6 years agoPost 14
Mputu

rrVeteran

Killeen, TX

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It is true that some fuel are not good, but regardless of what type of fuel you are running you still can get a rusted bearing as moisture builds up and stay at like that for awhile.

Fly hard, Land safe

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