Torque Tube double bearing install - HeliFreak
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Old 03-08-2011, 09:58 PM   #1 (permalink)
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Default Torque Tube double bearing install

I decided to build my TT with double bearings, i'm just wondeing what position on the shaft they should be. I read somewhere 70mm from center in each direction, but also read 130mm in each direction. Any ideas please?
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Old 03-08-2011, 10:11 PM   #2 (permalink)
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I was wondering the same thing. Cant get read of tail wag.Thought second bearing might get read of wag.
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Old 03-09-2011, 02:51 AM   #3 (permalink)
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I believe that aslong as the are not equidistance apart. Place the first one in the standard 50-60mm off center position and perhaps one 20ishmm from the tail.
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Old 03-09-2011, 03:39 AM   #4 (permalink)
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Quote:
Originally Posted by Corrari View Post
I believe that aslong as the are not equidistance apart. Place the first one in the standard 50-60mm off center position and perhaps one 20ishmm from the tail.
Because the 700's run two torque tube bearings, I have adopted Aligns method, which considerably reduced the vibration level and has been running well for over 100 flights.
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Old 03-09-2011, 08:58 AM   #5 (permalink)
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Quote:
Originally Posted by tony123 View Post
I was wondering the same thing. Cant get read of tail wag.Thought second bearing might get read of wag.
Ive been running 1 bearing on my 50's/90's with hundreds of flights and no issues for
1 1/2 years now.If you have a tail wag issue,its because something is wrong.If the TT is bent and you put another bearing in it to fix the problem,you'll have to change both bearings sooner than I would my one because the bend will put more stress on the bearing race.You can put 2 bearings in if you want but you should really fix the wag issue first and make sure its not a bent TT..
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Old 03-09-2011, 02:31 PM   #6 (permalink)
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Ive been running 1 bearing on my 50's/90's with hundreds of flights and no issues for
1 1/2 years now.If you have a tail wag issue,its because something is wrong.If the TT is bent and you put another bearing in it to fix the problem,you'll have to change both bearings sooner than I would my one because the bend will put more stress on the bearing race.You can put 2 bearings in if you want but you should really fix the wag issue first and make sure its not a bent TT..
I was going to say the same, but thought that a second bearing wouldnt hurt.
I agree, there should be no need for it. You must be absolutly sure there is no binding at all and all vibs are addressed. I have found wag issues to be random things, my last was a tight control link on the tail. one before was a slight binding on the tail push rod.
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Old 03-09-2011, 03:02 PM   #7 (permalink)
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Prior to installed a second radial bearing on the torque tube, my Skookum 720 mounted on Align PU gel - stock metal plate - second layer of PU gel said the vibration levels were between 5-10, now they are 0.5 in a hover and >3.0 in side-on tic-toc's.

Some many argue the torque tube may have been a little bent but I know for sure the inner moulding of the torque tube gears are not truly central.

Either way, this mod definitely reduced my vibration levels, on my 12s 600 ESP.
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Old 03-09-2011, 06:18 PM   #8 (permalink)
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I have tried new servo, gyro, and torque tube. It still wags. Im thinking his second bearing idea will be something cheap and easy to try. After that, it will be a baseball bat and then i know it will never wag again.
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Old 03-09-2011, 06:34 PM   #9 (permalink)
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I have tried new servo, gyro, and torque tube. It still wags. Im thinking his second bearing idea will be something cheap and easy to try. After that, it will be a baseball bat and then i know it will never wag again.
what esc and gyro and servo you got
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Old 03-09-2011, 07:33 PM   #10 (permalink)
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I have tried new servo, gyro, and torque tube. It still wags. Im thinking his second bearing idea will be something cheap and easy to try. After that, it will be a baseball bat and then i know it will never wag again.
You can put one in but adding the 2nd bearing isn't going to help.+1 on what minititinflyer said.Also check all your bearings,chipped TT gear,bent shaft,wire rubbing on the frame ect...
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Old 03-09-2011, 07:34 PM   #11 (permalink)
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stock esc. mini g gyro and a savox sh-1290mg servo. also alota guys do the third bearing block for vibration. so that was another reason why i thought his idea about the second bearing sounded good. helie had the stock gp780 gyro and alighn servo to start with.
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Old 03-09-2011, 08:15 PM   #12 (permalink)
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i put 3 on at ever 3rd of the lenth of the TT
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Old 03-15-2011, 10:36 AM   #13 (permalink)
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I just went with the single for the bird's maiden flight. I'll let you all know how it works when I get some batteries and spool her up. Thanks.
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Old 02-05-2016, 02:07 PM   #14 (permalink)
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Quote:
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I was wondering the same thing. Cant get read of tail wag.Thought second bearing might get read of wag.
I've been dealing with tail wag on my 450 for quite some time and waiting on some parts including tt and bearings. I noticed when installint the bearings to the shaft that the bearings do not fit tight. I wonder if we should be using a very soft epoxy for strait and true.
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Old 02-05-2016, 04:47 PM   #15 (permalink)
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Is anyone else concerned about the fact that the bearings are a bit loose on the TT? This causes the bearing to be untrue and crooked on the TT. My only thought would be to use a very soft adhesive. Does anyone have any ideas about this?
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Old 02-06-2016, 10:47 AM   #16 (permalink)
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I'm chasing a noisy tt issue. I've replaced the bearings and tt. Can't seem to get it true enough to keep it from being noisy. Also could be my front bevel gear's as they seem to be a little noisy. I don't remember it being that noisy but I have replaced everything twice. Is this normal because I really don't want to run it this way.
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Old 02-06-2016, 07:10 PM   #17 (permalink)
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If it's not causing flight issues, I wouldn't worry too much about the noise unless it has suddenly just changed noticeably. As for the loose hearings on the TT, use a very small amount of CA to secure them, being careful not to get any inside the bearing. Some soft epoxy might work too.
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Old 02-07-2016, 02:02 PM   #18 (permalink)
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RTFM .. is generally good advice. You should use some CA to fix the bearing to the TT, as the manual says.
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