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Home✈️Aircraft🚁HelicopterAlignOther › Pin the Torque Tube
08-02-2007 07:16 PM  13 years ago
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tbirg

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Mahopac, NY - USA

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Pin the Torque Tube
I had a problem with my tail last weekend...it was jumpy where it has also been smooth. I land the heli and bring it back to the bench. I am playing the with the when my tells me to grab the boom becuase it was really hot. I couldn't believe how hot it was. It was in the rear of the tail far away from the bearing so I was confused. Take the tail case off and low and behold the pin popped out of the TT and was cutting a nice groove into my boom.

Guys just be careful and check the pins on your TTs.
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08-02-2007 07:19 PM  13 years ago
Anthony.L

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Seattle, WA

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You need to put a piece of heat shrink over the pin. This will prevent the pin from coming out again. I learned that from watching the finless video on the torque tube upgrade and have done it since day 1, no pin issues.
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12-22-2007 07:02 PM  12 years ago
jet_d

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Phoenix, AZ

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Wish I would had read this post before building the bird. I got lucky this time and cought it before any damage could occur.

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12-22-2007 07:49 PM  12 years ago
JeepCJ

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Pennellville NY (Syracuse Heli Group)

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This is the first I have heard of the pin coming out. Does this happen on the stock setup, or has the pin been removed before to install the extra bearing? I am going include the heat shrink on the winter PM list.

Bob
Team Synergy/ Team Scorpion
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12-22-2007 08:08 PM  12 years ago
Zaneman007

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Texas - USA

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ditto what Jeep said?Old Guys Rule!
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12-22-2007 09:00 PM  12 years ago
jet_d

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Phoenix, AZ

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On mine the TT was brand new. I rebuilt my bird not long ago and the whole TT assembly is new. It came stock with one bearing and the pins installed. All I did was place the bearing according to the manual and put the rubber ring around the bearing. No mods. Although now that the pin is out, I'm going to add the extra bearing and use 3mm screws instead of the pins. The heat shrink is also a good idea though.
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12-22-2007 09:56 PM  12 years ago
j5coat

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Phoenix

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heat shrink and put a drop of ca also, i had my heat shrink move...Trex 700, Trex 600n
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12-23-2007 05:58 AM  12 years ago
tungym

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Underground

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That is odd as it is quite difficult to punch the pin out, even with a 3kg hammer!

BTW. anyone think of a carbon fiber torque tube?
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12-23-2007 06:34 AM  12 years ago
duceduc

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Saitama-Ken, Japan

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Just noticed my TT is bent after many flights. This is maybe the cause of my tail hunting at a hover with 1850rpm and up. I can't say for sure if the bent occurred because I installed a second bearing in the TT.

My pins have never slipped off after removing it to installed the second bearing. Of course I put a dub of CA inthe pin hole and around the pin.
Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01
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12-23-2007 06:51 AM  12 years ago
wings19

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Tucson, AZ

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is the second bearing necessary? If it was wouldn't Align put another one on there by now?Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter
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12-23-2007 08:21 AM  12 years ago
duceduc

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Saitama-Ken, Japan

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It is probably not necessary but Align does package a set of bearings & the guides separately.Duc S
Do It! Do It!™
AMA:REVOMIX
RCK:24005615-01
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12-23-2007 05:57 PM  12 years ago
lovespicyfood

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Westlake Village, CA- U.S.A.

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Just noticed my TT is bent after many flights. This is maybe the cause of my tail hunting at a hover with 1850rpm and up. I can't say for sure if the bent occurred because I installed a second bearing in the TT.

My pins have never slipped off after removing it to installed the second bearing. Of course I put a dub of CA inthe pin hole and around the pin.
OUCH, a bent torque tube and no crash? Is that possible? Are you sure it wasn't bent when taking out the pin and installing another bearing?
This is what I'm worried about a little in my build...
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12-23-2007 08:35 PM  12 years ago
Barney

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Inverness Scotland

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S.B.T.T.S. Self Bending Torque Tube Syndrome
Twice now I have experienced the mysterious self bending torque tube syndrome. The first time I replaced with a new tube. The second time I tried fitting a second bearing and it's done it again since.

I do leave a small amount of float so it's not being compressed.

On the 2nd occasion it bent so far I cant re-fit the tail gearbox as it's so far off center.

In the 30+ gallons this machine has flown I have blown 2 (fractured alloy ends) boom stays and had the glued none pinned replacements come loose maybe 4-5 times and wonder if the sudden give experienced when they go has flexed the boom excessively so far as to bend the tube.

But to be fair the model has been subjected to a lot of abuse

My other thought is the T/T supports are rubber rather than the plastic sleeves we more normally see and if resonance has built up allowing the tube to bend.

Anyone else had SBTTS
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12-23-2007 10:29 PM  12 years ago
JeepCJ

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Pennellville NY (Syracuse Heli Group)

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I had the non-pinned boom supports come loose, but the TT is still intact, I have about 15 gallons on the setup so far with no issues, or mods. Not sure if it has any bearing on it, but what gyro setup are you running?

Bob
Team Synergy/ Team Scorpion
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12-24-2007 12:03 AM  12 years ago
docjoe

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Stockton, CA United States

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I. Have gone through more than twenty torque tubes in the past year at least. I have them on three of my helis and have not had any problems.Joe
We haven't seen Colonel Angus around these parts for years!
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12-24-2007 12:29 AM  12 years ago
estevens

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Phoenix, Arizona

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My 600N also suffers from S.B.T.T.S. and it has never been crashed. Not sure if this is an issue or not. I did add extra bearings after the fact and used loctite RC/609 cylindrical retaining compound. Hopefully this works.
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12-24-2007 12:46 AM  12 years ago
joeycoates

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Dallas, Texas

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Wow, I just came to the Trex 600n forum to do a little bit of research on my out of true tourque tube. I have the gain on my Logictech 6100 down to 21% and I am still getting tail movement. I started to take things apart to look for a cause of vibration and after I took the boom of I turned the tail rotor and noticed the TT end moving around. Never been crashed and using the stock single bearing. I will but three bearings in on my next one, hopefully it will be true when I get it....
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12-24-2007 01:18 AM  12 years ago
baddynergy

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sierra madre, ca- usa

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I got a really great tip from someone else here on the TT. Use a raptor 60 TT. Cut it to proper length. Then modify the pins on the ends of the ends. The splines are the exact same. The raptor TT doesnt bend as easily as it is a little more flexible but truer. It migth just solve some of teh issues with the TT. I was at the LHS about 2 weeks ago looking for a straight TT and went through no less than 10 of them and they were ALL bent a little.**Unattended children will be givin a shot of espresso and a puppy**
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12-24-2007 02:37 AM  12 years ago
joeycoates

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Dallas, Texas

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Does anybody sell a Carbon Fiber TT? I could care less about the weight, CF would be straight though.
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12-24-2007 02:51 AM  12 years ago
50feet

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Wilmington, Delaware

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What is the diameter of the pin?
When I had a machine with a TT I used a nut and bolt with some thread lock. Shrink has been known to come off.
Youtube BigballVlogs
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