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Home✈️Aircraft🚁HelicopterAfter Market Accessories › Replacement bearings
08-03-2007 02:49 AM  13 years ago
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CX1

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Canada

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Replacement bearings
Q1
Has anyone found or used tapered bearings as a replacement for the stock items?

Q2
Is there a heli on the market that uses tapered bearings ?

Q3
If no heli kit exist that uses tapered bearings, Why not?

I included a pic for reference of what I mean

" Team Protoast "
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08-03-2007 03:30 AM  13 years ago
herby8860

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Conneaut Ohio

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Do they make tapered bearings that small ?
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08-05-2007 11:49 AM  13 years ago
bigglesbutler

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Aberdeen, Scotland

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Funily enough I asked Augusto of CX fame about this for the Avant heli's. He said he had researched it, and it is possible to get them that small, but they are expensive.Si
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08-05-2007 12:26 PM  13 years ago
CX1

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Canada

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Bearings
After doing a google search I found a couple of companies that do make them that small enough for a 30 size heli.

However most are too thick.

So why don't Heli makers use this type of bearing ??
" Team Protoast "
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08-05-2007 12:31 PM  13 years ago
z11355

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New England

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well, what is the load capacity of them vs. a thrust & radial combination?

No one is using them because I'll be that by time you calculate
size, cost, availablity, load carrying ability, etc, the thrust/radial
combo 'wins'.
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09-12-2007 02:57 AM  13 years ago
pphil611

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South Dakota

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tapered bearings
they handle thrust loads very well, however the problem is the radial clearance. You must set them with pretty tight lateral clearance (thrust) or the radial clearance will be too much. If you set the clearance below zero (preload) it makes them slightly harder to rotate. Lets say if you had one set perfect and used it as a main blade thrust bearing, the higher your head speed (more centrifical force) the clearance would start to open up and increase, the more centrifical force the more it would open up. I suppose you could use it as a thrust bearing (main blades) but you would need two ball bearings to maintain good radial positioning. Manufacturing costs are higher, the flat thrust bearings being used now are much cheaper to manufacture.
Spectra-G, MAH, CSM
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09-12-2007 04:44 AM  13 years ago
CX1

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Canada

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Good Point Pphil611
I wasn't thinking about the bearing expanding under lateral load,
thereby increasing friction under stress.
But they do, do well under radial stress.
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