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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsV-Bar › Bird has the shakes!!
07-04-2014 02:26 AM  6 years ago
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topekadave

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topeka ks

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Bird has the shakes!!
Ok I have a TT e700 TTG4 nitro an a TT50x nitro, ok all my electric helis that I've had have not had any issues, I put two nitros together an I've had them for a few months now an all I do is work on the junk! I take them to the field an no matter what I do the Heli shakes with high speed forward flight or any hard inputs, the tail wags back an fourth slow like I don't have enough tail gain. I turn the head gain up an down an it don't seem to make it any better on the shake an the tail don't get any better with tail gain! I've went threw everything, an tried strapping the senser down with zip ties an fuel line an I've tried different tape! Oh an they are silver lines with pro! Any help would be appritiated. My laptop stopped working so I have to come home every time I make a change. Very frustrating lol
------
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07-04-2014 12:01 PM  6 years ago
goof2

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Bristol,CT

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Have you tried to lowering your I gain on your tail ?
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07-04-2014 01:00 PM  6 years ago
ChristianM

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Oslo, Norway

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Make sure that the helis are really smooth. If the engine is running rough then it will affect the FBL performance regardless of which sensor you use or brand for that matter. Some other things to check:
  • Slop free linkages
  • Free running linkages (minimal friction)
  • Smooth power transmission - gear mesh not to tight, TR belt not too loose, gears in good condition
  • Stable power supply (holds voltage under load)
Good luck with chasing down your problem.

Christian
Burn fuel, be happy
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07-09-2014 03:34 AM  6 years ago
Jerry K

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Houston Area

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I had about the same problems as you described. I had an original black sensor that flew fine for a long time then issues described appeared. I chased down vibrations and it never got better. I finally purchased the Silver sensor and the problems are gone in both my 600N and 700N.

BUT since you already have the silver sensor, I bet you have a vibration problem. Disassemble the motor and check the back bearing. A rich motor can also cause vibrations. Then look at the mainshaft bearings along with the other bearings. With nitro you cannot do a bench run up. Maybe get a bluetooth so you can look at the vibrations during a flight. What does the log show? If you have more than 1-2 elevated vibrations you have a vibration problem.

If you have a smart phone get the VBar app and a bluetooth.

BTW my 700N had a slow tail wag that I never could tune out. But it is gone now. Good luck! you will find it.

Also since your E's don't have problems, that tells me it is a nitro vibration problem.
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07-15-2014 07:55 PM  6 years ago
Sam2b

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Tacoma, WA

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Absolutely Vibration
wags back an fourth slow
As Jerry says, it truly is a vibration issue. I've had this exact issue. The physical tail assembly is likely the issue. If you had a minor crash or a simple tip-over, the tail shaft and/or hub could be a bit tweaked.

** Have you replaced both the tail shaft and tail hub? Do so, and see if the issue is gone. Else, the mainshaft and/or feathering shaft may also need to be replaced. These shaft parts are expendable, and should always be targeted first for vibration issues.

Also, please don't bother balancing your own blades. Please! And never use another blade from another set of blades. Use the same set of main blades, and same set of tail blades. Don't put stickers, decals, or paint on blades at all. Some guys who do these things wonder why they have issues. These are strong machines, but delicate with rotation.
_Sam B_
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07-15-2014 08:19 PM  6 years ago
Jerry K

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Houston Area

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FWIT I concur
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07-16-2014 01:27 AM  6 years ago
topekadave

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topeka ks

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Thanks for the replys. I've never crashed one of them, an yes you are right on all that blade stuff lol an the crazy thing is both nitros do the same thing..------
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07-16-2014 08:14 AM  6 years ago
Sam2b

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Tacoma, WA

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Do you use straps or zip ties on the gyro? if so, remove all straps and only rely on the double-back foam adhesive for the gyro mounting. That's all you'll ever need (unless it is loaded with fuel exhaust and oil. In that case, it's time to relocate the gyro.)_Sam B_
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07-16-2014 02:29 PM  6 years ago
Jerry K

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Houston Area

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Again I agree, but I still use a velcro strap where I can, slightly loose that is assurance the sensor never comes loose. If applyed slightly loose it will not transmit any vibrations. In the past I have had the heavier gyros come loose and the outcome was not good.

Look at your logs if you have a vibration problem it will show up there!!!

Also try 3 bearing on the tail shaft. I had a 500 with vibration issues and that was the cure.
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07-17-2014 10:03 AM  6 years ago
Sam2b

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Tacoma, WA

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To ensure a gyro will stick and stay put, you must first clean all mounting surfaces with isopropal alcohol (regular rubbing alcohol). It should never come loose. I've flown nitro for more 1000 flights and never came loose in the slightest. And I've flown pretty hard with loads of fast pirouettes and speed, and crashes. It never came loose.

Any strap at all will transmit [some] vibration. But you can continue chasing this issue and keep wondering why.
_Sam B_
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07-29-2014 12:37 AM  6 years ago
topekadave

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topeka ks

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Got one of them fixed. Had to much head speed, went from 2100 to 2000 an all is good as fare as i can tell..------
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