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600 Class Electric Helicopters 600 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 03-08-2011, 08:58 PM   #1
djensen623
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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, 09:11 PM   #2
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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, 01:51 AM   #3
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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, 02:39 AM   #4
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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, 07:58 AM   #5
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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, 01:31 PM   #6
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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, 02:02 PM   #7
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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, 05:18 PM   #8
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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, 05:34 PM   #9
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Quote:
Originally Posted by tony123 View Post
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, 06:33 PM   #10
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Quote:
Originally Posted by tony123 View Post
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, 06:34 PM   #11
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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, 07:15 PM   #12
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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, 09:36 AM   #13
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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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