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skigolfmike
11-14-2008, 09:32 AM
One of the guys I fly with had something like that. His engine bearings went and we could hear it when he spooled up. The other sign was eating a glow plug a flight and finding out the rod was starting to scrape the bottom of the case.

skigolfmike
11-24-2008, 11:03 AM
Looks like I get to find out soon. The bearings in my Align 50 Hyper were making lots of noise when I landed yesterday. Original bearings made it through 4 gallons of fuel.

Sonny
11-26-2008, 12:22 AM
How well does the after run oil in the fuel keep the bearings from rusting? I'm thinking about buying a set of stainless steels for this reason.

rcmarty
11-26-2008, 01:24 AM
its at the back here. Can see edge of bearing http://www.helifreak.com/attachment.php?attachmentid=63386&d=1221862201

I'm thinking the bearing is the least of your worries right now !!

Sonny .. I wish i knew the answer to that , i went through 3 rear bearings (rcbearings SS/SS units) on my hyper this year , only 3-4 gallons of cool power 30.

Tried after run oil , storing invertesd ( blades down).

Now i've been taking the backplate off , putting airtool oil/marvel mystery oil in there, rolling the motor over a bit to work in and storing upside down (still open) , every few days i go and tilt sideways and roll the engine over again to re-ditribute oil on the rear bearing.

Next season i'll be running XP fuel (cp=18%oil , XP at 22%) , hope it fixes the issue.

My ys 91 ($400) motor has rust on th bearing after 12 flights (cp30) !

If there's an answer out there ... i'm all ears ... please ...

Martin :)

Sonny
11-26-2008, 01:27 AM
Looks like stainless steel for me. Maybe ceramic with stainless steel rings...

rcmarty
11-26-2008, 01:37 AM
My personal choice is the SS races with SS cages , and a phanolic (plastic) cage.

Why ..

well when the bearing goes bad with a plastic cage , it doesn't break up and go through the motor. My hyper 50 for example was so bad that the rod was gouging the case out, sending fine alum bits throughout , caused a few scratches and smoked alot of plugs (till i learned what to look for)

With a metal caged bearing (ys50 for eg) when the bearing goes bad the metal cage can breakup and go through the engine. This is it for the motor , small alum bit are bad enough , but metal cage bits are terminal.

While i haven't run ceramics to date , my understanding is that they chip when they go bad. Being much harder than metal , it's not hard to figure out what's next. Same as the metal cage but deeper would be my guess.

Martin :)

HydroJoe
11-26-2008, 11:10 AM
Looks like stainless steel for me. Maybe ceramic with stainless steel rings...


Get the rcbearings SS set, you cant beat them for $8. http://www.rc-bearings.com/catalog/product_info.php?products_id=212 . Looks like they are going to add a ceramic "hybrid" set in the future.

I got mine, put em in a friends heli and they work great. I cant believe that OS bearings are $30 a set. The RCB ones look like the exact same bearings.

RC-Bearings
11-26-2008, 01:30 PM
Get the rcbearings SS set, you cant beat them for $8. http://www.rc-bearings.com/catalog/product_info.php?products_id=212 . Looks like they are going to add a ceramic "hybrid" set in the future.

I got mine, put em in a friends heli and they work great. I cant believe that OS bearings are $30 a set. The RCB ones look like the exact same bearings.
The link on the page isn't looking at the right page. Hybrid set:

http://www.rc-bearings.com/catalog/product_info.php?cPath=22_27_28&products_id=28

OK, Fixed the links.

TheBum
11-26-2008, 01:34 PM
So, what makes them "hybrid"?

Coolice
11-26-2008, 01:40 PM
Hey All,

A friend of mine recently had to replace his Ceramic bearings in his OS Hyper as they had gone rusty, which surpirsed us.
Now it wasn't the actual balls which had corroded but the outer and inner steel race, the latter being very, very pitted and corroded.

The Ceramic bearings being mentioned in this topic is the steel outer & inner race made from stainless steel or just steel plated?

I'm curious as I to am now running an Align Hyper and will possibly face the maintenance of a bearing change and so want to know which way I'd possibly go.
.

HydroJoe
11-26-2008, 01:48 PM
So, what makes them "hybrid"?

I don't really know. I just see the link on bearing page. There is no information yet on what they are. For me....I have no intrest in ceramic motor bearings. I'm happy with the SS @ $8. Mine are lasting 10 gallons....pretty good.


I'm curious as I to am now running an Align Hyper and will possibly face the maintenance of a bearing change and so want to know which way I'd possibly go.
.

You WILL have to change the bearings, no doubt.

RC-Bearings
11-26-2008, 01:57 PM
So, what makes them "hybrid"?
HYBRID ceramic bearings have steel or stainless steel races and silicon nitride ceramic balls.

RC-Bearings
11-26-2008, 01:59 PM
Hey All,

A friend of mine recently had to replace his Ceramic bearings in his OS Hyper as they had gone rusty, which surpirsed us.
Now it wasn't the actual balls which had corroded but the outer and inner steel race, the latter being very, very pitted and corroded.

The Ceramic bearings being mentioned in this topic is the steel outer & inner race made from stainless steel or just steel plated?

I'm curious as I to am now running an Align Hyper and will possibly face the maintenance of a bearing change and so want to know which way I'd possibly go.
.
I have them in either bearing steel or 440 stainless steel. Stainless steel isn't completely immune to corrosion, just a lot MORE resistant than bearing steel.

HydroJoe
11-26-2008, 02:02 PM
HYBRID ceramic bearings have steel or stainless steel races and silicon nitride ceramic balls.

Paul.....Any idea when they will be availible (if not already?) What price?

RC-Bearings
11-26-2008, 02:16 PM
I have them in either bearing steel or 440 stainless steel. Stainless steel isn't completely immune to corrosion, just a lot MORE resistant than bearing steel.
They have been available for about 6 years! They are on the web site.
OS set: http://www.rc-bearings.com/catalog/product_info.php?cPath=22_27_28&products_id=28
Align set: http://www.rc-bearings.com/catalog/product_info.php?cPath=22_27_85&products_id=211

HydroJoe
11-26-2008, 02:25 PM
Sorry, I missed that you fixed the link.

MrCLoWnY
11-26-2008, 09:40 PM
They have been available for about 6 years! They are on the web site.
OS set: http://www.rc-bearings.com/catalog/product_info.php?cPath=22_27_28&products_id=28
Align set: http://www.rc-bearings.com/catalog/product_info.php?cPath=22_27_85&products_id=211


Hmm I thought the Align engine was an OS? If so shouldn't they use the same bearing? Or am I being a newb again. hehe

skigolfmike
11-27-2008, 12:25 AM
Look at the specs - same bearings.

I just replaced mine today. Took about an hour to pull the motor out of the heli, change the bearings and put it back in.

MrCLoWnY
11-27-2008, 12:39 PM
Ok, I think I will do this mod once the weather gets a lil nastier...

Sonny
11-28-2008, 02:18 AM
Get the rcbearings SS set, you cant beat them for $8. http://www.rc-bearings.com/catalog/product_info.php?products_id=212 . Looks like they are going to add a ceramic "hybrid" set in the future.

I got mine, put em in a friends heli and they work great. I cant believe that OS bearings are $30 a set. The RCB ones look like the exact same bearings.
I appreciate that brother...Thanks.