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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Another Hyper 50 bad bearing
10-26-2006 12:44 AM  12 years agoPost 1
Zman

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Florida

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Last weekend, I started encountering a bad high freq vibration that was causing excessive fuel foaming. I have been looking over the heli from one end to other this week and today finally resorted to pulling the motor and taking it apart. The rear bearing is shot. Very notchy and a bit of rust showing on outer case. This engine had just finished its 3rd gallon of fuel, never saw above 200 degrees during its short lived life. I guess I will send it off to hobby services . I guess the jury is still out on what is causing this?

Z

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10-26-2006 02:20 AM  12 years agoPost 2
Doug

rrElite Veteran

Port Saint Luice Florida....

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I think I will just give up

First member of Member of Bearings Anonymous

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10-26-2006 03:26 AM  12 years agoPost 3
Vendetta

rrVeteran

Miami, Florida 33173

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I keep hearing this... I think I'm going to replace the factory bearings after this weekends flying just to have one less thing to worry about......

-- Gentlemen, we can rebuild it... We have the technology....Better…stronger…faster...--

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10-26-2006 03:33 AM  12 years agoPost 4
turboomni

rrProfessor

East of the Equator

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What nitro do you use,15 or 30%? Just curious. My hyper is going on original bearing for well over a year so far with no problems. I WAS using 15% CoolPower. This summer I switched to 30% Magnum and so far so good ,,but wonder if guys running 30% have more bearing problems than 15% because nitro is an acid.

Setup is everything, All my heli's can fly far better than I can pilot them

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10-26-2006 04:52 AM  12 years agoPost 5
TMoore

rrMaster

Cookeville, TN

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25 gallons of Magnum 30% on my first set and I'm thinking about suing OS for designing a crappy engine. Actually the bearings are still good but the wrist pin gummed up and kept the piston from floating.

TM

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10-26-2006 06:41 AM  12 years agoPost 6
Gearhead

rrMaster

Vt

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""just finished its 3rd gallon""

as soon as I saw this post's topic I said to myself "what, in less than 3 gallons",,

from what I have read it DOES NOT matter what brand fuel or what percentage, some people will just have this problem !!,,

Byron's "Add a Oil" is a mixture of synthetic and castor, on my first Hyper I add 3oz to my first gallon, 2 oz to my 2nd gallon and 1 oz to my 3rd gallon, this motor NEVER had a lean run !! !! yet my bearing went bad in 2.6 gallons..

Jim

Jim
Buzz Buzz Buzz

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10-26-2006 06:49 AM  12 years agoPost 7
jkelly

rrVeteran

Bedford, PA

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I used to only run 15% in my engines and they always looked great inside but I've been running 30% for a couple years now and the bearings seem to always look rough. I don't change them often and I like running 30% because it tunes so easy. So for me the trade off is worth it. Rust seems to appear more often now that I'm using 30%.

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10-26-2006 10:27 AM  12 years agoPost 8
Zman

rrKey Veteran

Florida

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I use 15% CP but before I posted this I went through and read a bunch of other bearing threads and my take is it doesnt seem to matter on nitro% or brand. I think there is a design problem. People have swapped out to Boca's, ceramics etc. and still loose the bearing eventually. The one thing I cant explain are the ones who have 30 gallons of fuel through theirs and still no problems?????

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10-26-2006 01:08 PM  12 years agoPost 9
Doug

rrElite Veteran

Port Saint Luice Florida....

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Think "axial clearance"

First member of Member of Bearings Anonymous

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10-26-2006 06:13 PM  12 years agoPost 10
Zman

rrKey Veteran

Florida

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Doug,

Is there a thread or could you explain more about axial clearance. I am really interested in doing something that would help save my bearings. Obviously the real solution will be for OS to step up to plate and address the issue but until then I rather not have to send my engine in every 3 gallons

Thanks
Mike

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10-26-2006 09:35 PM  12 years agoPost 11
Doug

rrElite Veteran

Port Saint Luice Florida....

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Look at your "PM" and search on "Coke can Mod" and anything on "OS50 bearings" Read it all to get the big picture

First member of Member of Bearings Anonymous

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10-26-2006 10:56 PM  12 years agoPost 12
turboomni

rrProfessor

East of the Equator

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Great stuff Doug. You said you were to try the Ceramic bearings,,how did they work out? Also saw the pic of your friends stock bearing without castor shutdown like you do. Is it your feeling then that rust is generally not the failure problem with the bearings and mostly lack of preload is?

Setup is everything, All my heli's can fly far better than I can pilot them

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10-27-2006 02:27 AM  12 years agoPost 13
Chopper Man100

rrVeteran

Canton GA.

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I have been running
my hyper 50 for 2 summers, engine is still smooth, I don't even know how many gallons I have through it. I just switched to 30% from 15%. I just went through 4 gallons of fuel in the last couple of weeks. I have a standard 50 on my bench that I pulled out two years ago because the bearings started to get notchy. Haven't replace the bearings yet, maybe this winter.

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10-27-2006 09:56 AM  12 years agoPost 14
cupra

rrApprentice

leicester uk

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3 hypers 15% cool power 30+ gallons on most of them no worries never dry them out but do fly then every week at least
1 has had a new ring only no bearings

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10-27-2006 01:20 PM  12 years agoPost 15
Doug

rrElite Veteran

Port Saint Luice Florida....

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turboomni

The corrosion needs to get really out of hand before it causes a bearing falure.( the surface discolloration does no harm). (Make it a habit to dissemble your used bearings to see the wear pattern). Yes, I have run ceramic hibrids also with shims,they are operating ok as well.

First member of Member of Bearings Anonymous

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