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Fast Lad Performance . Ace Hobby . Esprit Model

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Beginners Corner > What does a thrust bearing do?
 
 
irq
Key Veteran
Location: San Diego, CA

Would anyone out there mind providing a detailed explanation about what a thrust bearing does? Also, I remember when I was building my Sceadu, and I was putting the thrust bearings for the main rotor and the tail rotor in, the directions said to put one side with the smaller inner-diameter in a certain place. Each part looked to me like it had the exact same inner-diameter, after looking at each one carefully. I just couldn't see a different. My machine flies correctly, though. Is it possible someone might want to post a really zoomed-in picture showing the differences? (preferably of the bearings that come with the Sceadu)

Thanks!
04-30-2002 Over year old.
 
 
Ken B
Elite Veteran
Location: Phoenix, AZ

Thrust bearings support the centrifugal load of the blades and their grips. This is preferred over side loading a radial bearing.

The inside diameters are easily checked by sliding each on to the shaft that they are designed to fit. You should be able to tell which one is sloppy compared to which one is tight. The tight one is then the small diameter. There is ususally only a few thousands of an inch difference so checking them visually is a tough chore.

Ken B
04-30-2002 Over year old.
HOMEPAGE  
 
 
the Wasp
rrProfessor
Location: Vt

NO,,, there is a difference in the steel thrust wasers, you realy need to get this right !!
04-30-2002 Over year old.
 
 
irq
Key Veteran
Location: San Diego, CA

Yes, I am quite aware that there is a difference; after all, if they clearly state that fact in the manual, I should believe it, right?

My question wasn't whether or not there was a difference - but how to tell the difference.
04-30-2002 Over year old.
 
 
Malorie
Elite Veteran
Location: Paw squared, MI

As Volkul said, you can typically tell which is the smaller diameter by test fitting them on the intended shaft. The smaller one will usually fit snug to the shaft and the larger one should have some slop. If you have a dial caliper you should be able to measure the difference.

Hope this helps,
Mal'
04-30-2002 Over year old.
 
 
Malorie
Elite Veteran
Location: Paw squared, MI

The smaller race goes to the outside of the blade grip. If you reverse these they will actually cause your pitch to lock up at higher RPM. It's real nice if you like to fly fixed pitch.

Mal'
04-30-2002 Over year old.
 
 
the Wasp
rrProfessor
Location: Vt

sorry,,, dial calipers,,, Dude...

the Wasp
04-30-2002 Over year old.
 
 
PHI flyer
Senior Heliman
Location: Bowie, Maryland

And I'm here to tell ya from experience, if you dont get them in the right position the heli wont fly. I upgraded my Concept 30 with thrust bearings in the main blade grips and had them reversed on one blade and the heli just sat there wobbling and screeming.
04-30-2002 Over year old.
 
 
irq
Key Veteran
Location: San Diego, CA

I must have them all in right then, since my heli flies fine I'm going to double check anyway, though.
04-30-2002 Over year old.
 
 
PHI flyer
Senior Heliman
Location: Bowie, Maryland

Dont fix it if it aint broke!!
04-30-2002 Over year old.
 
 
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Thunder Power RC . Mikado Modellhubschrauber . GrandRC

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Beginners Corner > What does a thrust bearing do?
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