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CarbonXtreme . Midland Helicopters . HeliProz

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Main Discussion > Anyone got THE answer?? before I give up for good!
 
 
Raptor Pilot
Senior Heliman
Location: Northern Ireland

My Posts This: Topic  Forum

I use 401 gyros and 9254 servos on the tail on all my helis and if one of them starts to judder the tail from side to side, not a wag like the gain being too high, after months of being perfectly normal the first thing i do is examine the gyro sticky mounting tape and i usually find it is starting to seperate into two pieces, one sticks to the gyro and the other stays stuck to the heli. Replace the gyro tape and the heli is normal again. If the gyro tape is fine then 2 or 3 clicks leaner on the main needle cures it to. Again these are what works for me but if they can help you jgheli, then thats great.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!
04-20-2009 11:23 PM
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The_Dave
Veteran
Location: Las Vegas / Pahrump, Nevada

My Posts This: Topic  Forum		~

The engine is your answer...that bad boy is hammering...I would look there.

Mark McAlpine - 2005 - We will never forget.
04-20-2009 11:35 PM
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Mr502go
Heliman
Location: Kennesaw, GA

My Posts This: Topic  Forum		Also ensure your boom supports are tight.
04-20-2009 11:44 PM
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jgheli
Heliman
Location: united kingdom

My Posts This: Topic  Forum		What sort of distance do i need from the regulator to the servo lead and gyro? Obviously space is tight....
Weather is too bad to fly today, tomorrow looks good though.

I did take the engine out today for a clean - but also to check the fan as somebody else mentioned that might cause me the problem. There is a tiny (almost invisible) warp to the fan. Could this be it? I repeat though, the warp is less than 0.5mm.

Im guessing this isnt the issue.

Tail bearings are all smooth.
04-21-2009 07:37 PM
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rotormonkey
Key Veteran
Location: Ottawa, ON - Canada

My Posts This: Topic  Forum		Just don't run the wires bundled up right next to one another. I'm inclined to say the fan isn't the problem.
04-21-2009 07:50 PM
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helinelly
Veteran
Location: st.helens england

My Posts This: Topic  Forum		hi there matey

is your tracking ok............also check your clutch bearings....mine started vibes realy bad the other week it turned out to be the clutch bearings......any advice to stop the shaking is good...hope you find it regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me
04-21-2009 08:19 PM
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mlucia
Veteran
Location: Essex Jct., Vermont

My Posts This: Topic  Forum
Quote 
where is mounted? My had issues while mounted above the servos; moved back and problem solved;

I had the same issue with my 600np. There was a ton of rf interference mounting it on the front 2 servos. Placed in the back and all was good. This was a gy401 and 9254 as well. You can see it while on the bench actually. Lots of twitching going on



-Mark

Compass USA field rep
04-21-2009 08:31 PM
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predatorman
Senior Heliman
Location: Falkland Islands

My Posts This: Topic  Forum		If you have a torque tube tail drive, check the fittings within the tail gear box.

I had a bad vibe around the tail of my Predator a while back. It was one of the fittings on the drive train coming loose. It would go away if I landed and powered down...I could power back up and the vibe would go...but then come back again after I had flown a circuit.

Just a thought.

Quality takes........time!
04-21-2009 08:43 PM
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doorman
Elite Veteran
Location: E.Berne, NY

My Posts This: Topic  Forum		You may want to check to confirm that the carrier bearings are in the proper position in the tail boom so that you are not getting a "whip" in the drive shaft...
Just a thought...
Good luck

Stan

Team Hirobo/MRC --- RCLIGHTS.NET ----- If there is a cure for this, please don't tell me about
04-21-2009 10:58 PM
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heliraptor10
Key Veteran
Location: kokomo, in-US

My Posts This: Topic  Forum		If it is a gyro mounting issue you might consider a foam cradle for the gyro.

I made one so that zip ties hold the cradle and then the cradle has a separate tie system to hold the gyro.

There is no way for vibration to hit my gyro without having to go through foam first.

Have it set up like this on my 450 and my Raptor e550

Part of pushing limits is occaisionally finding them
Too rich for my blood
04-21-2009 11:24 PM
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Gyronut
Elite Veteran
Location: Martinsville In.

My Posts This: Topic  Forum		Had the same issue with my new 600 this past weekend and leaning the mtr cured it.

Rick
04-21-2009 11:51 PM
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RaptorMan23
Veteran
Location: Sioux City, IA

My Posts This: Topic  Forum		I know exactly what your fighting, Im about 99% sure. PM sent, Ill have to call you or somthing becuase Im not writing 2 pages

It has to do with "mechanical gain", not gyro gain, Ill explain on the phone
04-21-2009 11:57 PM
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GREYEAGLE
Key Veteran
Location: Sioux City IA

My Posts This: Topic  Forum		Check your switch

Tough one for me to admit but I've done it ! Make sure 401 dip switch is set to DS. !!! Same symtom ! I guess I must of bumped it when I was in a hurry

greyeagle
04-21-2009 11:58 PM
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GREYEAGLE
Key Veteran
Location: Sioux City IA

My Posts This: Topic  Forum		Just squirt over the white paper ! too him

Don't tell me you erased it !!! Dang that's got to got in the Black Book ! the other one with the 3 RIng's

greyeagle
04-22-2009 12:00 AM
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heliraptor10
Key Veteran
Location: kokomo, in-US

My Posts This: Topic  Forum		Ain't it wonderful?

One problem,
and hundreds of different possibilities.

Do helicopter tails run on Windows?

Part of pushing limits is occaisionally finding them
Too rich for my blood
04-22-2009 12:01 AM
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Yug
rrMaster
Location: UK. Herts

My Posts This: Topic  Forum		Lots of reasons why you may be experiencing this problem. Could be a system balance issue or a physical issue when under load.
Perhaps dodgy pot on the 9254 which is effected by vibes
Gyro mounting - try Zeal
Engine running too rich
Tail boom support resonance - try a simple brace
TR pushrod force overpowering the servo - check TR dynamic balance
Check for binding of pitch fork under load
What effect does different gains have ?
Try reducing mechanical gain by moving in a hole
Consider playing with chinese weights to lower the servo loads

Vegetable rights and Peace
04-22-2009 12:22 AM
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RaptorMan23
Veteran
Location: Sioux City, IA

My Posts This: Topic  Forum
Quote 
Try reducing mechanical gain by moving in a hole

Thats what I was talking about, I just wanted to explain to him "why" that is mechanical gain and what effect it has on his gyro
04-22-2009 12:23 AM
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holzback
Veteran
Location: noblesville IN United States

My Posts This: Topic  Forum		in a hover watch your tail, and when it moves take note to any change in the sound of the engine.
04-22-2009 12:38 AM
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jgheli
Heliman
Location: united kingdom

My Posts This: Topic  Forum		wow, loads of answers.
It seems that leaning the engine might be the cause. Mainly as I have tried most else. Too windy again to try!!
i will come back when i have tried some of your great suggestions.
Thank you all for your help.
04-22-2009 08:23 PM
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ch-47c
Key Veteran
Location: san jose, ca

My Posts This: Topic  Forum		Motor 4-stroking will pulse the drivetrain out to the blades and the gyro will attempt to correct it. Give up for good? Never.
04-23-2009 12:54 AM
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Ron’s HeliProz South . MTA Hobbies . Model Rectifier Corp

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Main Discussion > Anyone got THE answer?? before I give up for good!
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