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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › my 700 got some bad vibration
06-17-2009 08:57 PM  11 years ago
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D-fly

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cincinnati, oh

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my 700 got some bad vibration
I just built my 2nd 700 and tried a YS91Sr for the 1st time. I set the needle to factory. I have the Outrage 90 pipe. the 1st 2 tank was rich to where to tail wagged a bit which was in sync with the engine.

The next 2 tanks the wag was practically gone but screws were comming loose like crazy in my tail. The tail boom guide broke. I replaced it and it broke again. You cant visually see any part of the heli shaking.

Help. Del
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06-18-2009 12:42 AM  11 years ago
abc123

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va, usa

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Was the whole heli just vibrating or was it shaking in a particular way? (up-down, side to side)
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06-18-2009 01:54 AM  11 years ago
AgentOrange

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Jacksonville, Florida

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+1 with abc need more info on the vibe to help fix itTrying not to put them in the dirt.
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06-18-2009 12:19 PM  11 years ago
rcnut

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Rockford, Illinois

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Hey guys, based on what D-Fly said,
but screws were comming loose like crazy in my tail. The tail boom guide broke, or both. I replaced it and it broke again.
It sounds like the TT is bent and or the bearings on the TT were glued crooked. High frequency vibrations. this would explain why the tail boom guide broke. The tail screws, a possible locktite issue.

D-Fly, with this vibration problem, I would check all the other screws to make sure there tight.
Team Miniature Aircraft
"I love the smell of Nitro in the morning!"
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06-19-2009 01:31 AM  11 years ago
D-fly

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cincinnati, oh

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I appreciated the help
It is a brand new heli I built. Their are no visible up and down or side to side shaking. Maybe it looks like the heli is trimbling but it is not really obvious.

The TT I measured the BB placement and spun it in the boom it looks ok. What do you mean by the BB crooked. When they are on the TT they fit snug, no room for tilting.

Today I looked at the tail and placed the tail on a balancer. It was off. Then I took off the tail blades and placed them on the balancer and they were way off. These are the Align tail blades that came with the heli. Could this be tha problem?

Prior to my 2nd vibration flight I took the clutch hub out and rotated the clutch on the hub per the suggestion of a friend. That didnt make a difference.

Is it in the tail or the engine/clutch if it is a high frequence vibration?
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06-21-2009 10:21 PM  11 years ago
haq0901

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Miami, FL USA

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make sure that your frames arent on crooked, ive seen this happen before and causes a high freq wag...

Herman
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06-22-2009 03:29 AM  11 years ago
marc8090

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Long Island, N.Y.

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Yes, tail blades out of balance could certainly cause your problem. Additionally, I noticed when I built mine if you don't use enough lube when you insert the torque tube into the boom it's possible for the rubber bearing supports to slip off the bearings leaving the torque tube unsupported inside the boom. As a final note, if the screws coming loose are the ones holding the boom supports on, you may want to try red loctite instead of blue.
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06-24-2009 05:00 AM  11 years ago
D-fly

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cincinnati, oh

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marc and others
Thanks
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