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Gasser Model RC Helicopters > Clutch bearing on Predator Gasser 26cc
 
 
Billme
Key Veteran
Location: MS

Guys, I fixed the TT bearings from coming out by taking a solder pin, and melting the holder edge every 90 degs to hold the bearing in..

What was causing them to come out was the auto clutch chattering...In fact it has caused every problem you have mention, plus others..

What cause me to look at this hub was the fact I was tuning a Spectra for Mark in NY at Dalton Ga..The tail was just quivering coming and going... I new dang well it wasn't the engine, so I done a few test to confirm it, like lifting the heli, up and down, resting it on the ground, I would allow the pitch to zero out, but keep the rpm up..You could focus on a sockethead bolt, but in the air(load) you could not focus...You can learn to tune the adjustment with the clutch on the Spectra after you study it...

After learning all this, I'm convinced on all machines, the trouble is not the engines usually, its always in the drive train somewhere on all that I've worked on..

Now, with Wally's new fan, that thing is really changing everything..I'm still getting use to it.
Gassers have always suffered from summertime heat, but this fan has got the power back up...
I have been in this for a long time, and can tell you, it doesn't matter what you buy, your going to have to learn every characteristic of whatever machine you buy to keep it from costing you money...
For as Century on the Predator, it will evolve fine once they start making it in their own plant..Their vendors have cause them a lot of problems ...
I specialize in making things work with what you have, and I have put in no telling how many hrs finding, and fixing problems..I can tell you this that auto hub fix changes everything on this heli...

After three years, I'm finished with it, finally. Its a good cheap heli
Bill
07-23-2008 07:16 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Whoa!

Quote 
After three years, I'm finished with it, finally. Its a good cheap heli

WHAT does that mean Bill? Are you going to get a Spectra?

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-23-2008 03:27 PM
 
 
C.A.P.
Senior Heliman
Location: custer park IL.

The bearing is the trouble it self. It's wrong for outside use. It is a shielded bearing good for indoors not for outdoors. You need to change all of you bearing to sealed. This one of the worst thing about the Century, One bad bearing from dirt. Will cause drag on the hole heli. and cause a crash from RF. MADE when a bearing goes bad. where I live there is fine farm soil. This easly gets past a shielded bearing. I'v had a new century bearing last one week flying 1 hour a day. With the sealed there is no trouble at all period. a seal bearing has better lub in it .And are of better quality and a longer life cycle. Good bear cost more. But you will not remember when you changed it last. The thingS you are feeling in the bearing is small pieces of dirt or sand. Only a sealed bearing will stop this. LUB. WILL NOT STOP THIS. GETTING THE RIGHT BEARING FOR THE USE, IS THE ONLY WAY TO GO. Remember if you have one bearing go bad, Like roaches there are many more on their way.
07-23-2008 09:08 PM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
On the pruchased assembly from century (the second clutch bearing) went bad because there was not enough of a press fit between the inner race of the bearing and the boss of the clutch bell that eventually gave out, developed slop, allowed the inner race to spin against the aluminum and eat away at it.
>>>
they were always willing to send me parts to correct kit problems, very friendly but I was always told more than once they didn't have anyone on staff that knows the Predator.

Not for nothing, isn’t Bill a representative for Century? Isn’t he here helping everyone that wants to listen? Doesn’t he have private conversations with people on his own time? I think this is a terrible slap in the face that is not warranted. Is there another forum that has representatives solving problems on a day to day basis with other kit manufacturers? I know Raja likes MinAir but he is not a representative that I know of. You can clearly see the long term issues with MinAir on the comparison thread.

Quote 
"you must have someting wrong."

I think they are right. Just because you build molds doesn’t mean you understand machinery. Molds are specialized tool design. Machine design requires a much broader understanding of interdependent technologies. I don’t know what Century is presently producing but I have both clutch bell versions in my two Predators and neither has even a remote problem with the main gear hitting the frames. You should note that the bottom collar on the main shaft should be reversed based on what autorotation hub you are using.

Ace
What could be more fun?
07-23-2008 09:30 PM
 
 
Gas and Go
Heliman
Location: Western Wisconsin- USA

No Ace Bird I think I know how machines fit together, or rather should fit.
07-24-2008 02:42 AM
 
 
Billme
Key Veteran
Location: MS

Assuming the parts are put together right on a helicopter, a millimeter might as well be a mile so long as no parts fail...The gear height is fine when everything is put together right...

The biggest culprit on the gear height is usually the lower mast bearing not being seated, which lowers the gear...If your spacer is at least 2.9mm thick, there shouldn't be a problem ...
You should be able to see daylight all under the hub, and see the spacer..If you can't, you have something wrong...

Concerning cheap bearings..I have no problem with cheap bearings..

Bill
07-24-2008 04:29 AM
 
 
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Gasser Model RC Helicopters > Clutch bearing on Predator Gasser 26cc
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