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Old 03-02-2012, 09:49 PM   #1 (permalink)
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Default 1 or 2 Bearings?

In the boom on the torque tube?? what are you guys using? I am starting the slow rebuild and I have an extra bearing, does this actually help with vibs at all?
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Old 03-02-2012, 10:14 PM   #2 (permalink)
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I use two...
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Old 03-02-2012, 11:15 PM   #3 (permalink)
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Quote:
Originally Posted by snjbird View Post
I use two...
And so did I
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Old 03-02-2012, 11:52 PM   #4 (permalink)
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did you guys notice any differences with having 2 bearings?
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Old 03-03-2012, 12:05 AM   #5 (permalink)
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One

Always have, in the specified spot

Never a vibe issue, never failed.

Every vibe issue I have tracked down has never been solved by adding another bearing to the TT
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Old 03-03-2012, 02:58 AM   #6 (permalink)
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Quote:
Originally Posted by Deet View Post
One

Always have, in the specified spot

Never a vibe issue, never failed.

Every vibe issue I have tracked down has never been solved by adding another bearing to the TT
This is so true.
Why not 3 bearings ot maybe 4?
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Old 03-03-2012, 07:09 AM   #7 (permalink)
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Of the 3 TT shafts I've purchased since converting, not one has been very straight. And for the money, I'm not going to do the "Roll it on a flat surface to straighten it out" technique.
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Old 03-03-2012, 08:41 AM   #8 (permalink)
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Tail belt is the way to go, you will never look back and spend money again
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Old 03-03-2012, 04:21 PM   #9 (permalink)
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I have never seen a bent TT , new in packet
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Old 03-03-2012, 06:54 PM   #10 (permalink)
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I just never check. I like to assume its straight
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Old 03-03-2012, 09:18 PM   #11 (permalink)
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even if it is bent, 2 bearings can't fix that
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Old 03-03-2012, 09:49 PM   #12 (permalink)
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Quote:
Originally Posted by Deet View Post
One

Always have, in the specified spot

Never a vibe issue, never failed.

Every vibe issue I have tracked down has never been solved by adding another bearing to the TT
same here.
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Old 03-03-2012, 10:07 PM   #13 (permalink)
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Since I was curious, and my 500 Pro is equipped with an SK-720, I tested the "two TT bearings reduces vibes" theory. The attached screenshots are from the SK-720's vibration spectrum analyzer. The big peak in each plot corresponds to the tail rotor RPM, which is where tail vibes show up.

Bottom line: no significant difference in tail vibes with an additional TT bearing. In fact, two TT bearings resulted in slightly higher vibes, but the results are close enough such the difference can be ignored.
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Old 03-04-2012, 02:02 AM   #14 (permalink)
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I had a strange noise a few months back so I added another bearing but it did not help (turned out at the end it was old Boca beraings in the motor). I did not take it out but I don't think there's a significant advantage. I never had a bent torque tube, always checked when pulled a new one from the package.
As for the belt, it was the part that cost me the highest repair cost ever when broke so I ditched the belt setup and never looked back. YMMV.
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