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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › Bearing options for YS91 SR
02-25-2010 03:47 AM  10 years ago
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Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Bearing options for YS91 SR
Other than stock, where are you guys getting your bearings for your YS91 SR engines?

I got a couple bearings awhile back, and out of 2 rear bearings, one had a bit of play in it. Sure enough, when installed I can still feel the play.

So I'm looking to get some higher quality, consistently high tolerance bearings for this thing.

Thanks.
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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02-25-2010 03:49 AM  10 years ago
Tyler

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Chicagoland area

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OS rear bearingEnjoy things that money can buy IF you don't lose the things money can't buy.
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02-25-2010 04:05 AM  10 years ago
george0079

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USA

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Boca, or RC bearings.

Never had a problem with either
Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!
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02-25-2010 04:18 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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Boca, or RC bearings.

For Boca, do they identify it as a YS91 SR bearing, or do you need the specific dimensions???
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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02-25-2010 04:25 AM  10 years ago
george0079

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USA

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The part number works fine. You can also find it under the engine model. They list it for the 91ST engine. Same bearings

16003 is the number for the rear bearing.

The prefix before the number indicates the various styles (ie. Stainless, Ceramic, ect)
Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!
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02-25-2010 04:42 AM  10 years ago
TMoore

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Cookeville, TN

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I use "Center Glide Bearings".

TM
Part 107.
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It's like getting a driver's license without the driver's test.
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02-25-2010 05:00 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I use "Center Glide Bearings".
Never heard of those. Who makes them??
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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02-25-2010 05:18 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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The prefix before the number indicates the various styles (ie. Stainless, Ceramic, ect)
Stainless has the advantage of not rusting. But stainless is a softer metal. So do I realy want the "high Performance" Boca bearings instead?

I want them to last longer than the stock, but I don't want ceramic.
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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02-25-2010 05:21 AM  10 years ago
george0079

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USA

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Personally, I don't think the higher performance bearings are worth the extra $$$.

I buy the standard bearings, and replace them when needed.
Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!
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02-25-2010 06:02 AM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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I buy the standard bearings, and replace them when needed.
george,

So in your experience, are the Boca standard bearings higher quality than the stock???
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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02-26-2010 03:13 PM  10 years ago
supertigre

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Castle Rock, Colorado

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Stainless
Stainless steel bearings aren't significanly softer than bearing steel. Both have to be hardened to the same Rockwell range. Stainless is generally a couple points less hard but still in the range. The main advantage is that they won't rust easily like bearing steel will. The difference is the amount of chrome in the alloy. Regular bearing steel has about 1-2% chrome whereas stainless has 12-18% chrome. The steel itself will still rust but the chrome forms a very tough chromium oxide layer to protect it from oxygen combining with the iron.
Paul Mcintosh
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03-02-2010 05:58 PM  10 years ago
Rockohaulic

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Canyon Country, CA, USA, 3rd Rock from the Sun

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So I ordered a set from RCBearings and one from Boca. They both came in yesterday.

As you know, these are for my YS91 SR engine. The large, rear boca bearing is an "open" bearing just like the others, but it came packed with grease.

Do I need to clean out all of this grease with rubbing alcohol before I install it???
Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know
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03-02-2010 09:06 PM  10 years ago
gonkulator

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Sutter, ca., usa

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I would clean out the grease and coat
it with some residue oil (oil left over when
nitro evaporates). That's eventually going
to be your bearing lubricant. My 2 cents.
(don't use contaminated oil)
Is this fun or what :)......
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