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ZoomsHobbies . HeliHobby . Ron’s HeliProz South

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Align T-REX 600N 700N > Two flights per bearing?
 
 
dannyh5
Senior Heliman
Location: England

I know there has been allot of chat about the one way bearing issue, but I may have a slightly different take on it. I have just flown my 600 sport today, only 2 flights and you guessed it the one way bearing seized. So I took it apart and a needle bearing dropped out, those who have followed this topic on other threads will have seen this as well, but has anyone see why?
I have found that the cage has distorted and slit in several places, the distortion has squeezed some of the bearings, probably the cause of the lockup, and in other places the slots that house the needle bearing have become so large the retaining spring can’t hold the bearings in place, so they fall out.
This is not a question of which grease to use, although it may help, but more a question of bearing choice. We have a cheap plastic bearing race in an extreme environment, imagine how much pressure the cage is under with the bearings locked in as they should be as you put your heli through some demanding 3d manoeuvres.
The guy than selected this bearing for this position was obviously complete yogurt, and I have emailed align about this.
07-29-2007 Over year old.
HOMEPAGE  
 
 
ringram2077
Senior Heliman
Location: Birmingham, AL

Yes, been there done that, needle bearing fell out into hand. Looks like a totally inadequate design (mine says Germany on the end). I may be wrong but I believe the Raptor 50 V2 one way is a larger diameter and and looks much better constructed.
07-29-2007 Over year old.
HOMEPAGE  
 
 
kingair
Key Veteran
Location: Utah - USA

raptor 50 oneways are notorious for locking up too.

There is a very fine line between "hobby" and "mental illness."
07-30-2007 Over year old.
HOMEPAGE  
 
 
ringram2077
Senior Heliman
Location: Birmingham, AL

Quote 
raptor 50 oneways are notorious for locking up too.

I had a problem early on with the rappy one way, but after a while it settled down an had no more problems. The rappy one way was much easier to free up that the trex when it locked. The trex is nasty.
07-30-2007 Over year old.
HOMEPAGE  
 
 
kingair
Key Veteran
Location: Utah - USA

I had a problem for a while with the raptor oneway. My 600 oneway (made in Germany) hasn't given me any problems yet with over 50 flights and over 8 hours of flight time (knock on wood).

There is a very fine line between "hobby" and "mental illness."
07-30-2007 Over year old.
HOMEPAGE  
 
 
WJackson
Key Veteran
Location: Smyrna, Delaware

Mine locked up once this weekend. Said screw it and flew anyway (what the worst a new sleeve and bearing?) Went to put the heli away after a couple addition flights and its free again. Go figure. hasnt locked up again so far .

Bill Jackson
07-30-2007 Over year old.
 
 
dannyh5
Senior Heliman
Location: England

Your right, it’s not going to cause a crash, but it will cause your head to over speed even if you are using a governor.
07-30-2007 Over year old.
HOMEPAGE  
 
 
SC Raptorman
Senior Heliman
Location: South Carolina

I fixed mine this week end by using some Silicone Heat Transfer Compound part no. 49643 by Dynatex . It keeps the bearing cool and slick , my bearing was locking up on spool up , thats how annoying it was . 4 tanks later still no lock up.

Oh what a feeling flying 3D can be
07-30-2007 Over year old.
 
 
WJackson
Key Veteran
Location: Smyrna, Delaware

Quote 
Your right, it’s not going to cause a crash, but it will cause your head to over speed even if you are using a governor.
????? Only thing a locked auto hub will do is rob some inertia on auto's. Thats all.

Bill Jackson
07-30-2007 Over year old.
 
 
dannyh5
Senior Heliman
Location: England

With the clutch fully engaged, normal flight, and the heli in a rapid decent the head will over speed. Now because your one way is locked up the blades will try to drive the engine through the fully engaged clutch, if you have a governor fitted this could cause a problem because your governor is closing the throttle to slow things down but your blades are speeding things up. It’s not just a case of a little more load in autos at all, the job of the one way bearing is to prevent the blades driving the engine when the clutch has engaged, not to unload for autos.
07-30-2007 Over year old.
HOMEPAGE  
 
 
WJackson
Key Veteran
Location: Smyrna, Delaware

Disagree, but hey, its a free country, here and there!

Bill Jackson
07-30-2007 Over year old.
 
 
aamwood
Heliman
Location: Indonesia

It happened to me too. It costs me 2 bearings for 8 flights. Now, after using the white lithium grease. The problem is gone. Check this out : www.wd40.com I use the spray can.

I think the bearing is fine, it is just Align is using a different kind of lubricants. Which I think is not good.

I hope it helps.
07-30-2007 Over year old.
 
 
GyroFreak
Key Veteran
Location: Florida ... 28° 50' N 81° 16' W

dannyh5

On both my helis (X-cell and Hawk Proo). The chutch shoes are on the engine shaft, the clutch bell is on the blade shaft. Once the engine dies you can spin the clutch bell to 10,000 rpm and the clutch stays disengaged.. Unless the cluth shoes rotate (which won't one a stopped engine. )the clutch will not engage the main drive shaft.

THe clutch is primarly for starting and idling. Without a clutch starting a heli would be dangrous and difficult since te blades start turning as soon as you apply the starter, and with no clutch you could not hold them, or if you did , STRIPPED GEARS"...k

Support bacteria. They're the only culture some people have. !
07-30-2007 Over year old.
 
 
kingair
Key Veteran
Location: Utah - USA

The clutch remains engaged with the clutch bell until centrifical force is reduced on the clutch shoes enough that they disengage from the bell. Depending on how tight your clutch is, your engine probably won't disengage until you're on the ground. My friend has a 600 and the oneway locks from time to time. It's very easy to hear that the engine is being dragged all the way to landing.

There is a very fine line between "hobby" and "mental illness."
07-30-2007 Over year old.
HOMEPAGE  
 
 
GyroFreak
Key Veteran
Location: Florida ... 28° 50' N 81° 16' W

kingair

Very true, thanks...

Support bacteria. They're the only culture some people have. !
07-30-2007 Over year old.
 
 
Paul Susbauer
Senior Heliman
Location: Spokane Valley, WA

Its interesting to read all the differences in one way results. Some of you have had them lock up easily, some not at all. Some are destroying them, some are not. I haven't done anything to mine and knock on wood, but its working fine so far. I did not even bother to grease or put oil on the one way. Time will tell.

--Paul

Ineptitude - If you can't learn to do something well, learn to enjoy doing it poorly.
07-30-2007 Over year old.
 
 
dannyh5
Senior Heliman
Location: England

I understand what you are saying, but my point is when I’m flying and my clutch is engaged ( engine running at max ) and I pull full neg form height so the heli descends rapidly, the blades can over speed and drive the engine faster still. I know how the clutch works, thanks though.
07-30-2007 Over year old.
HOMEPAGE  
 
 
uragem
Senior Heliman
Location: Indianapolis, IN - USA

DannyH5 is right.

Indy Jeweler - She gets the jewelry - I get the helicopters!!!
07-31-2007 Over year old.
 
 
ringram2077
Senior Heliman
Location: Birmingham, AL

DannyH5
You are correct, I witnessed the exact thing today on the desents with the locked one way on my 600N.
07-31-2007 Over year old.
HOMEPAGE  
 
 
rcmike
Senior Heliman
Location: Dickson, TN

Mine has locked up 4 out of 5 flights. I cleaned it out after the fourth flight and put a couple of drops of ATF in it. On the 5th flight with the ATF in it it still locked up but just barely. The other times with the stock grease in it it was very hard to free up. Hopefully it will get better since I got the grease out but who knows.
07-31-2007 Over year old.
 
 
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Align T-REX 600N 700N > Two flights per bearing?
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