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HelicopterEngines Plugs Mufflers Fuel › Bearing for OS max Hyper 50
10-24-2009 08:02 AM  8 years agoPost 21
Aaron29

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USA

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I consider my time worth money.

Say you get paid 20 bucks an hour...Every 5 gallons, or every bearing change, you "spend" an hour, which is your labor, and is worth 20 bucks. Not to mention the bearing itself isn't free. So now you're up to 30 bucks, let's say.

Do 8 bearing changes and you've bought yourself a YS-50.

I don't consider it a "small price to pay."

Now if you enjoy the bearing change process, great!

Me...When I finish work Friday, I want to spend the weekend enjoying myself. A surprise bearing failure hardly is fun. It stops your flying and you have to take your heli home and wrench on it while your buddies fly at the field. I get VERY frustrated.

And I really don't consider it to be a one hour process. You have to remove the engine. This alone is a PITA. The throttle arm, the carb, the governor, the mounting system all have to be removed and they are usually caked in nitro stinky fuel slime residue. Then you have the engine and must completely disassemble it. Then you have to clean it. Then oven it. Then get that bearing in it. Then let it cool. Then rebuild it. Then put it back in. blah blah It's a PITA. You have to decide if you are going to dial indicate it. Luckily most fans just screw on.

I consider it an enormous price to pay which is why I've binned my last Hyper.

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10-24-2009 08:11 AM  8 years agoPost 22
GimbalFan (RIP)

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Big Coppitt Key, FL

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Well, as Frank Zappa (or some lesser known 60's songwriter/bandleader) once long ago said, "You can tune a guitar but you can't tuna fish".

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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10-24-2009 08:12 AM  8 years agoPost 23
Aaron29

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USA

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O.K.

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10-24-2009 01:44 PM  8 years agoPost 24
w.pasman

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Netherlands

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I was in the same boat, Did that a few years, changing the bearings 9 times in that period. bearing change almost exactly every 50 flights with the hyper.

Last time I did the coke can mod and the bearing lasted 242 flights. I must add that I also flush my engine with fresh fuel at the end of the day since the moment I placed the coke can mod.

I think this more or less solves the bearing problem for me.

I did one rear bearing replacement after that but that was because I was desparate to solve another problem. The bearing was in fact fine (so replacement was probably not necessary) and it did not solve my other problem....

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10-24-2009 02:01 PM  8 years agoPost 25
Leif

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USA

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THERE IS AN ANSWER

From what I read, the cause of the Hyper 50 bearing failures was answered indirectly by representatives from OS.

When asked if the new OS55HZ would have the same bearing problems as the OS50, they said that they had fixed the problem in the new engine design. When further pressed on the details (since both helis share the same bearing sizes), the technical reason was explained:

The crank case on the OS50 Hyper is not designed for the power loads of the engine. If you look at the crankcase, there is only one reinforcing fin on each side. This means on the power stroke that the crank case itself can flex. This flex causes premature damage to the rear bearing.

The OS55 crank case was engineered with additional reinforcing fins on the sides around the crankshaft. This reduces (eliminates) the flexing of the crank case and supports the rear bearing properly. According to the reports that I heard this results in bearings that live as long as they do in most other engines.

This is what I heard, but I think that this possibly answers the question once and for all. Why OS didn't release a redesigned crank case for the OS50 Hyper long ago is the big mystery.

Leif

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10-24-2009 02:12 PM  8 years agoPost 26
HIGHSTRUT

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Spring City, Pa. USA

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How can you know when the engine develops a bad bearing,I never experienced one.

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10-24-2009 02:43 PM  8 years agoPost 27
red_z06

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Dumont, NJ

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How can you know when the engine develops a bad bearing,I never experienced one.
You will start to hear the grinding noise get louder as the bearing deteriorate. This is most audible when the engine is in idle as higher rpm would mask the bearing noise.

You can also record the idle sound when the engine is new and compare it to new recording as the bearing wears down.

www.JustinJee.com

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10-24-2009 03:00 PM  8 years agoPost 28
Aaron29

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USA

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And the mixture becomes inconsistent. Overall poor running. Grinding noise at idle. Additional vibrations.

It is no secret when it starts to fail your engine will start acting up.

The key is to inspect/replace at first indication. If you continue to run a bad bearing it will catastrophically fail and could take out a lot more than just a bearing.

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10-24-2009 03:18 PM  8 years agoPost 29
Wingman77

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Pulaski Tennessee

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I had a bearing fail in my hyper 50 this past weekend and took a chunk out of the piston and sent metal shards thru the enging....made quite a mess.

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10-24-2009 03:31 PM  8 years agoPost 30
Aaron29

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USA

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...and the Hyper found another victim.

My sympathies, man.

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10-24-2009 03:46 PM  8 years agoPost 31
reddragon

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Brooklyn, N.Y.

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Forgive my ignorance since I don't own a O.S. .50 Hyper. Isn't a Hyper engine the same as the older O.S. .50 SX-H sans the cooling head and the carb? If that is the case why are the Hyper engines having more bearing problems than the older O.S. .50 engines?

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10-24-2009 03:53 PM  8 years agoPost 32
nickt919

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New Orleans, Louisiana

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Reddraggon you have a point. All I need is a reliable 40E carb and I should have a decent 50. My older SX-H engines never had this problem.

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10-24-2009 05:22 PM  8 years agoPost 33
w.pasman

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Netherlands

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reddragon,

My guess is that the 50H head gives better cooling. With better cooling you can develop more power and that might cause the problem.

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10-24-2009 10:21 PM  8 years agoPost 34
Gearhead

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Vt

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Leif,, my answer/question to Mr.OS would be something like,,,

"Oh Dear Mr. SO,,, can you please explain why Crank Case Flex will make the UN-branded Chinese Rear Bearing Rust yet not make the Japanese made NTN Front Bearing Rust ?? and why Crank Case Flex would make only SOME of the UN-branded Chinese Bearing rust while some don't, and why Higher Quality Rear Bearings like NSK and SKF don't rust in 2.5 gallons ?????!! "

reddragon,,
after having the "Stock" NSK bearing in my Older OS 50 (Silver Head) last 4 terrifying years withOUT ever adding After Run Oil, AND after letting my Hyper 50 with a SKF Rear Bearing set for 5 months in my garage withOUT adding After Run Oil and it NOT rusting, I'm MUCH more apt to believe that the UN-named Manufacture OS is buying from is producing a given amount of Bad Bearings for every given amount of Good Bearings they make,,,,,, that would make clear sense why some Bearings Rust and some don't and why some Bearings go Bad and some don't..

Jim
Buzz Buzz Buzz

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10-25-2009 12:49 AM  8 years agoPost 35
reddragon

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Brooklyn, N.Y.

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Thank you Jim.

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10-25-2009 02:17 AM  8 years agoPost 36
BLUETHUNDER

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Glass City

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Old OS 50 Hyper bearing made by NTN? I believe

http://www3.towerhobbies.com/cgi-bi...p?&I=LXWW82&P=Z

New OS 55 Hyper bearing made by SKF

http://www3.towerhobbies.com/cgi-bi...p?&I=LXXYH8&P=Z

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10-25-2009 02:57 AM  8 years agoPost 37
Aaron29

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USA

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For just $25.

Things better darned last!

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10-25-2009 04:05 AM  8 years agoPost 38
Leif

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USA

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can you please explain why Crank Case Flex will make the UN-branded Chinese Rear Bearing Rust yet not make the Japanese made NTN Front Bearing Rust ?? and why Crank Case Flex would make only SOME of the UN-branded Chinese Bearing rust while some don't, and why Higher Quality Rear Bearings like NSK and SKF don't rust in 2.5 gallons
If there was a bearing that held up in the Hyper as well as any other engine, I think this would be known by everyone by now and we wouldn't be having these discussions.

There have been reports by so many people who have tried all possible solutions (including the use of high-dollar quality bearings). This leads to the conclusion that there is something inherently wrong with this engine's design. It will be interesting to see how the OS55 holds up. Yes, they are also going to a better quality bearing in that engine but I don't think that is the only factor or the deciding factor.

Personally I've never had a Hyper bearing fail by rusting.

Leif

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10-25-2009 04:52 AM  8 years agoPost 39
Gearhead

rrMaster

Vt

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Bluethunder,, if you click on that Bearing Photo in the Top Link you posted you will see it is an NSK Brand Bearing, I still have that NSK that was in my Silver Head OS 50,,

Leif,,
in the last 4 years the Hyper 50 has been on the market I have not read any complaints of higher Quality Bearings like SKF or NSK, can you please post links to some..

I think it tells me a lot when the NSK in my Sliver Head 50 lasted 4 years and the SKF not rusting after setting 5 months in my garage all winter without adding After Run Oil !!

Oh, and to add, and with my Silver Head 50 I had a Weston Mini Pipe and a 60B carb, I turned a Head Speed of 2100 and 2200, that gave me Engine RPM of 18,000 and 19,000, again that NSK lasted 4 years..

hey, I'm not saying I'm correct about all bearing failures in the Hyper 50, I just say this is what I have found to be true, and what I believe..

Jim
Buzz Buzz Buzz

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10-25-2009 04:59 AM  8 years agoPost 40
Gearhead

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Vt

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""For just $25""

""Things better darned last!""

Aaron,, I bought a UN-branded Bearing, and I bought an NSK, and SKF,,, the SKF felt smoother than the other 2,, so far so good, we will see that's for sure ..

Jim
Buzz Buzz Buzz

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HelicopterEngines Plugs Mufflers Fuel › Bearing for OS max Hyper 50
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