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HelicopterCompass Knight 50 ODIN 90 › One way grease
11-28-2007 12:06 PM  9 years agoPost 1
SP4772

rrApprentice

Mirabel, Québec, Canada

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Do you guys leave the factory grease in it or clean and put some tri-flo...i know there is no problem with that bearing and mine is still smooth after 119 flights but since i have it in my hands, i was wondering...

By the way, i just add a third bearing bloc on the main shaft (just above the main gear, there is holes on the frame just for that). What a difference when turning the main shaft by hand! Much more solid feel. I'll see if i notice a difference in flight. It will certainly help the bearings a bit since the stress will be on three instead of two.

I also put a Hirobo Sceadu collar to avoid the main shaft moving up and down (tic-tocs...). It is bigger than the original, so must be stronger.

WWJD??

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11-28-2007 03:29 PM  9 years agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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SP4772,

Much has been written about this topic but I'll save you the time of "DOING A SEARCH".......most would agree that sprague clutches are not designed to be "greased".....so IMO, a good cleaning with carburator cleaner or BrakeKleen followed by a light oiling with triflo should be the ticket......

All that being said, in your case I would do absolutely nothing based on your quote below......I'm a subcriber to the KISS method (keep it simple stupid) AND along with that saying comes this one......"Why fix something that ain't broke ?"
i know there is no problem with that bearing and mine is still smooth after 119 flights but since i have it in my hands, i was wondering...

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11-28-2007 08:06 PM  9 years agoPost 3
Adey_Law

rrVeteran

Bournemouth, UK

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Juan,

its a torrington not a sprage :-)

i leave the normal grease in there and might top it up with a bit of triflow grease after a wnhile.

Ade

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11-28-2007 09:35 PM  9 years agoPost 4
JuanRodriguez

rrProfessor

The Villages, Florida

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Ade,

Torrington is the trade name of one of the companies that manufacture the sprague clutches and other types of bearings....

What we have in our helis are sprague clutches...... people often mistakenly refer to them as "one way bearings" or as "torrington bearings" where in fact, they are not bearings at all !!

When driven (by the motor via the main gear), the clutch "locks" onto the shaft thus transmitting power to the rotor via the main shaft....When the clutch is NOT driven, the rollers "unlock" from the shaft allowing it to free wheel....the rollers inside the clutch do that job..... if you crap up the rollers to the point where they cannot freely move, the clutch will not work properly and can cause the lockups we often read about..... that is why it is generally recommended that you don't use grease which can attract dirt, etc....., and can prevent the rollers from moving freely.

And so the rest of my recommendations to SP4772 stand....

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11-28-2007 10:44 PM  9 years agoPost 5
Adey_Law

rrVeteran

Bournemouth, UK

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so whats the difference between a raptor 90 bearing and a synergy bearing? they look very different in their structure?

Ade

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11-28-2007 10:56 PM  9 years agoPost 6
JuanRodriguez

rrProfessor

The Villages, Florida

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Ade,

I just did some editing on my last post just to clean it up a bit.....content did not change, though.....

I have never seen a synergy bearing so I can't specifically say.... but I can pretty much assure you that although they may look different, the principle is still the same.... they are clutches.....

Some may have a different external shape (such as "hex" but their internal workings are the same. The rollers are either "engaged" or "not engaged".......

Also, their internal "number" of rollers, etc...., may be different depending on the manufacturer..... principle remains the same....

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11-28-2007 11:59 PM  9 years agoPost 7
SP4772

rrApprentice

Mirabel, Québec, Canada

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Guys, that is my first nitro so i don't know what i can expect performance speaking, with the Knight's one way (...or sprague clutch!). I read the threads (and SEARCH) about the one ways and found mostly about the 600N. I did not heard any problems with our one way. Seems to be holding well and still smooth after 119 flights.

WWJD??

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11-29-2007 12:50 AM  9 years agoPost 8
JuanRodriguez

rrProfessor

The Villages, Florida

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I read the threads (and SEARCH) about the one ways and found mostly about the 600N. I did not heard any problems with our one way.
Re-Read my first post......that's why I advised you to do nothing at all...... it's not broken....... don't try to fix it !!!

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11-29-2007 12:51 AM  9 years agoPost 9
Rodney

rrVeteran

St.Cloud,Florida

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I will have to agree with ADE on this one. Century had 2 types of drives. One being a one way bearing with needles just like everyone else. The the latest is the sprauge type. Which is a bunch of finger like parts all sloped to one direction, it seems that there is no cage holding them in like the needel type.

Dx7 With Ion Power Supply. Why use anything else.

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11-29-2007 02:27 PM  9 years agoPost 10
JuanRodriguez

rrProfessor

The Villages, Florida

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Rodney,

I know we've gotten into a "tangent" here but please re-read my post.....

What you're describing is a differnce in "design"......The term "one way bearing" is a misnomer even though everyone uses that term interchangably...... Both designs are sprague clutches.....

It's like people routinely calling a photocopy of a document a "Xerox copy"......Today, there are many companies in addition to Xerox making copiers...... but to this day, people still refer to them as Xerox copies even though the copies may have come from a Canon copier.....

Honestly, I don't mind anyone disagreeing with what I'm saying but if someone can point me to technical information to the contrary, I'm all ears and eager to learn.....

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11-30-2007 03:34 AM  9 years agoPost 11
petmotel

rrKey Veteran

DeKalb, IL.

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Juan, no need to be apologetic for being right. Nice to have someone explain that "one way bearing". It's quite obvious that it's a clutch, and not a bearing.

About the same time I got my Sport, I also purchased a "greaser" tool for the bearings. I packed grease into that one way in my new bird and it locked up in short order. Now there were a batch of bad one ways back when the Sport was first introduced, and I'm not sure if it was the grease or not, but now I clean them and use tri-flow or ATF for all the one ways and it works well for me.

Jay

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