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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Bearing for OS max Hyper 50
10-25-2009 05:12 AM  8 years agoPost 41
nickt919

rrVeteran

New Orleans, Louisiana

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In all of my bearings that went out the outer race is pitted and rusted at BDC of the stroke. Each roller ball is full of flat spots instead of being smooth and round...kind of like a Flintstone bowling ball. I really do not buy into the over power or flex ideas. I'm inclined to believe it's plain old crappy bearings. The more expensive bearing going into the new 55 accounts partially for the big price jump.

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10-25-2009 05:23 AM  8 years agoPost 42
Gearhead

rrMaster

Vt

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nickt919,, if you looked back threw all my post you will find one where I say I once had a guy at an On-Line Bearing Distributor tell me the problem comes from NO Preload on the Bearing ?????

this guy didn't fly, but he did own/buy and rebuild Glow Engines for a hobby, and for his friends that did fly he built Model Turbine Engines as a hobby, so he did know a bit of what he was talking about LOL..

Jim
Buzz Buzz Buzz

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10-25-2009 05:49 PM  8 years agoPost 43
Rick_H

rrKey Veteran

Boulder City, Nevada

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"I'm inclined to believe it's plain old crappy bearings."

I read and hear these kind of statements all the time but if that were the case why is it the bearings replaced with high quality expensive bearings still had these bearings fail. Yes they lasted longer but still failed.

I am inclined to believe what the OS tech said, or what the Wasp said about No Preload.

My bearing just failed with no signs of rust, the bearing spacer broke in two places and took out the piston, ring and liner.

My OS 55 will be here in a few day's, Well see how well it holds up.

Rick

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10-25-2009 11:24 PM  8 years agoPost 44
freakyreef

rrKey Veteran

Kansas\Colorado border

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If it is indeed the crankcase that is the problem. Wouldn't ALL hypers share this problem since they all use identical cases? I have yet to have a bearing fail in one of my hypers. I have no clue why, I read and am ready for the day when I may need to replace one but for now, I just keep my fingers crossed. I have also heard of of many others who have never had a bearing fail. There has got to be something else at work here.

What REALLY baffles me is this. I stored my helis in a backroom which contained the filter and open sump for a saltwater reef aquarium. Cant get much higher humidity than that!! Run the bugger on an Evo50 at 2050 RPM.Those 2 factors should have been the death of bearings. Go figure. I guess I have just been one of the lucky ones.

Walk on water long enough, eventually you will get your feet wet.

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10-26-2009 01:38 AM  8 years agoPost 45
Leif

rrElite Veteran

USA

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If it is indeed the crankcase that is the problem. Wouldn't ALL hypers share this problem since they all use identical cases?
Not necessarily. It might be that crank case flex only occurs when the engine is pushed to a certain point in either RPM or HP. This could be why the non-Hyper versions of the same motor don't see the same failure rate (even though they are exactly the same engine except head and carb). It also could be that slight variations in the casting quality or alloy between one engine and the next impact the stiffness of the engine.

There is enough statistical data to indicate that this particular engine has a design problem. Everyone has their own pet theory based on anecdotal or personal experience, but it's hard to argue that this engine goes through bearings (of any type) faster than most others.

Leif

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10-26-2009 09:16 PM  8 years agoPost 46
alanrw

rrNovice

Chatsworth, Calif.

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OK, the Part number from VXB Bearings is as follows:

6902ZZ 15x28x7 Shielded
6902-2RX 15x28x7 Sealed bearing.

They were 10 for $29.95 back in June 2007.

As I stated earlier, we are running these bearings in our OS 50 Hypers with 30% Nitro and the issue of failing rear bearings has all but disappeared for us here at the Sepulveda Basin. You are free to come to your own conclusions but for $3 a bearing, really, what have you to lose?

We started with the shielded bearing and it seems to work splendidly. The conclusion we came to is that OS really cheaps out when it comes to bearings.

alan

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10-27-2009 03:15 AM  8 years agoPost 47
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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Thanks for the P/N's, Alan. I'll try those next batch I buy.

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

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10-30-2009 11:01 PM  8 years agoPost 48
ragusa63

rrNovice

athens greece

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Thank you all for your help I ve read very carefully all the answers.
Thx again

Helis are forever.............

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08-04-2010 12:24 AM  7 years agoPost 49
duckmansweb

rrApprentice

Sunshine coast, QLD, Australia

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alanrw: OK, the Part number from VXB Bearings is as follows:

6902ZZ 15x28x7 Shielded
6902-2RX 15x28x7 Sealed bearing.

They were 10 for $29.95 back in June 2007.
is them ?

http://www.vxb.com/page/bearings/PROD/Kit7446

CHANGING THE WORLD ONE HELI AT A TIME

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10-27-2010 09:05 AM  7 years agoPost 50
soneebee

rrNovice

Philippines

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I got this replacement bearings from one of our local bearing shops. cost around $3.15 each. I brought the original OS hyper bearing and they gave me this as this is the exact replacement.

Will it be better if I dont remove the cover? or will removing the cover be best...

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10-27-2010 01:59 PM  7 years agoPost 51
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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Most people will tell you to remove the shields as that is how they come in a new motor. It will work if you don't. There is plenty of lube in the lower end to get by the shield. Boca Bearing recommends shields on their ceramic bearings. This is because the balls on ceramic bearings can break up into small pieces and destroy your whole motor. The shields help to hold the pieces inside the bearing if this happens. This does not happen with steel bearings. So it has been done. It is possible that the shield could even help to hold the lube inside the bearing and help prevent rusting. Myself, I would remove it, just because that is the way I have always run my bearings. But it is up to you.

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10-28-2010 01:16 AM  7 years agoPost 52
soneebee

rrNovice

Philippines

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thanks GMPheli..... Yup got the motor done.. removed the shield from the bearing and got the motor up and running. Wow what a big difference. The hyper was purring like a kitten.. so silent......

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11-16-2010 03:34 PM  7 years agoPost 53
Richardmid1

rrProfessor

Leeds, England

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This is another one of those why do align helis wear out quicker than others and the answer is simple, soooo many people running this motor day in day out, thrashing the pants off it, that is why you here about so many bearings going bad!

The last one I had lasted 7 UK gallons! Thats about 12,000,000 revolutions! Not bad really!

60% of the time, it works every time!

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11-16-2010 10:09 PM  7 years agoPost 54
Gearhead

rrMaster

Vt

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look at this off a RCU thread
quote:

ORIGINAL: DR NITRO

For the past few years I have been paid to test run engines for a model fuel company. Since I have my own private flying field and am out in the middle of nowhere and retired, I can do this till my heart's content and not bother anybody. Mostly I run them on the several engine test fixtures, then a few of them I will actually fly on one of my planes or heli's. I even have a set of load beams to mount on car engines and a ducting system to cool the head when I test run them. I have gone through lots of engines, some were good , some were junk.

I use as a baseline, the average 40 size two stroke will run 15 minutes (at varying throttle positions) on 8 ounces of fuel. My goal is to get 400 hours on an engine or 100 gallons, whichever comes first. I have had numerous engines make it past this mark and a few that did not. To be be fair, I do a few things that the less experienced modeler does like shut them down for the day and do nothing to them until they are run the next day, I also run them a bit lean but only to the point where the rpm's are peaked, not past peak and generally use a prop that is on the small end of the scale for the given engine. I do run them on a fuel type that is intended for that design or recommended in the instructions. and always two identical engines are run identically at the same time, one with a competitors brand fuel and one with the company I'm contraced by, just for comparison.

Anyway, to make a long story short, I have run the engines you mention above and a bunch more of the OS line, this is what I got before the engines just simply wore out:

25FX- got to about 6 gallons
32SX- got to about 20 gallons after the first set of sleeves
40FX- got to about 20 gallons
46FX- (early ones) about 6 tanks
46FX- (later ones) about 40 gallons
OS 50- (airplaneversion and heli versions)- could not get past 10 gallons without it puking the bearings, longevity testing suspended on the modern OS 50
61FX- got to about 65 gallons
OS70 Heli-got to about 3 tanks on both engines, rods gave out. replacement engines made it to about 15 gallons
91FX- got to about 35 gallons
160FX- (after several tries and replacement motors, testing was abandoned)
OS 120 Surpass III- bearings failed around the 15 gallon mark, heads warped around the 50 gallon mark
OS 91 Surpass- got about 80 gallons before it was just plain worn out
OS 70 FL- after about two gallons of frustration, testing was abandoned.

As a comparison, heres some of my test engines that are in either the 400 hour club or 100 gallon club
Fox 35 CL, 40 bushing, 40BB, 45, 46, 50 and 74
Enya- 25, 40's (all the 40's), 50SS, 50CX, 60 (all versions) and 4-strokes: 46, 53, 90, 120 (old and new) and the 155 (everything tested)
Irvine- 46, 53
Super Tigre (italian)- 34, 40, 45, 51, 75, 90, 2300, 4500 (no chineese ones tested yet)
K&B (Pre Mecoa)- 40 (4011), 48, 61
Thunder Tiger- 25, 40, 42 bushing, 46, 61, 65 bushing, 120 and 4 strokes: 91 and 120 (everything tested)
Magnum- 46 (the only model tested)
Webra- 50
YS- 45, 53, 91AC
Saito- 56, 65, 72, 80, 91, 100, 120, 180 (everything tested)
Moki 135, 180 (everything tested)
MVVS 40, 49, 77, 91 (everything tested)
Rossi 45, 53 (everything tested)

Now heres some that did not make it to the club:
Anything Mecoa
Anything Leo
Anything MDS
Anything OS (modern)

Don't flame me guys, these are just the results experienced. In all cases, fuel should not have been an issue since failures in the OS line on one fuel were very soon repeated on the other, which indicates design problems

Jim
Buzz Buzz Buzz

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11-17-2010 11:31 AM  7 years agoPost 55
Richardmid1

rrProfessor

Leeds, England

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10 gallons is good enough for me!

Anyway, hes paid to test engines, doesn't mean he knows what hes doing!

He should have replaced the bearings and kept on testing to see how long the rest of the engine lasted.

60% of the time, it works every time!

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11-17-2010 09:04 PM  7 years agoPost 56
Gearhead

rrMaster

Vt

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well really he is paid to test the fuel.

Jim
Buzz Buzz Buzz

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11-18-2010 10:06 AM  7 years agoPost 57
Richardmid1

rrProfessor

Leeds, England

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Well I run Optifuel and the bearings seem to be lasting.

60% of the time, it works every time!

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Bearing for OS max Hyper 50
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