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HomeAircraftHelicopterThunder TigerRAPTOR 90 › Pice of crap machine wont stop shaking no matter how much time and money goes into it! FIN
02-09-2008 11:43 PM  10 years agoPost 1
guntube

rrApprentice

Marietta Ga.

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I have a rappy 90 that is not going to be happy until it blows itself apart! I have two of these birds and the first one has over 100 flights on it without so much as a twich at ANY rotor head speed. Bird #2 just seems to be a piece of junk. I have replaced every part that moves over the past 6 months and it wont go away! I have used mulitple sets of blades, tails shafts,paddles, all bearings, tailblades, and masts, ect... ect... you name it I have replaced it, but it is still shaking like crazy. Everything has been checked before installing and it has all been straight and true. I even went to war with the tail boom shafts to get them straight and happy. Again, multiple tail shafts, multiple bearing arrangements, with multiple bearings. How can this be?

Putting divots in the earth the hard way!

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02-10-2008 12:30 AM  10 years agoPost 2
homerlex

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USA

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Have you tried swapping heads on your birds to see what happens?

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02-10-2008 12:47 AM  10 years agoPost 3
guntube

rrApprentice

Marietta Ga.

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yep! One shakes one doesnt. This sucks

Putting divots in the earth the hard way!

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02-10-2008 01:34 AM  10 years agoPost 4
steve9534

rrKey Veteran

yakima, wa.

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R90
Something is bent or out of balance and replacing something else doesn't fix it, as you've now discovered. I bent a couple of the plastic head blocks on mine and replacing them fixed the shakes. They looked fine, but were damaged and the heli would shake with them on. Another common place for mystery problems are the bolts that secure the mixers. These can be bent and you can still get the blades to track by making the links unequal in length, but they can make the tracking go out and the heli vibrate as you give cyclic inputs. Hope this helps. steve.

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02-10-2008 02:16 AM  10 years agoPost 5
MarshallB

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Middle Arkansas

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What exactly is shaking? Is it the tail section or in the head area?

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02-10-2008 02:40 AM  10 years agoPost 6
Qrrambero

rrKey Veteran

San Francisco / Bay Area

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I don't know if I have the answer for you.
I had the same problem and it was driving me crazy.
One day I put the tail case apart because I damage the gears and I found out that the drive shaft was bent. Don't ask me why? I have asked and I haven't had the answer. Tail boom was fine, everything was ok. I just wanted to remove the shaft to clean it and I found out that was bent.
Just check it, and see if that is the problem.
Good luck.

Ae

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02-10-2008 03:05 AM  10 years agoPost 7
guntube

rrApprentice

Marietta Ga.

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Had to slip away for a second. The whole machine is shaking up and down like the old rubber pencil trick (thats what the boom looks like). I think I might take the suggestion of replacing the head block(again) I have a new metal one in the package but I might stick a pair of the stock dampners in it. The red ones are tooo hard. Does this sound o.k. or will the stock dampners cause a shake in the metal head?

Putting divots in the earth the hard way!

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02-10-2008 03:25 AM  10 years agoPost 8
steve9534

rrKey Veteran

yakima, wa.

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Guntube
The red dampners will cause a head wobble or shake if the head speed is low. The softer stock dampners are more tolerant of low head speeds. steve

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02-10-2008 03:27 AM  10 years agoPost 9
guntube

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Marietta Ga.

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I might try this first. Thanks.

Putting divots in the earth the hard way!

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02-10-2008 03:44 AM  10 years agoPost 10
RYOTGEAR

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USA

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How high is the head speed and is it shaky thruoghout low and high speeds?If it is running too slow,you will get a wobble and gyrating action.

MATTER SET FREE

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02-10-2008 04:57 AM  10 years agoPost 11
BJames111

rrElite Veteran

San Diego, California

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I believe we spoke on the phone. Did you ever try increasing the headspeed? OMG, if you were just running the headspeed low with red dampers, I'm gonna be really frustrated...

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02-10-2008 05:19 AM  10 years agoPost 12
hypoxia88

rrNovice

western australia

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One step at a time Grasshopper.
If you have a hard to find fault it is essential that you only replace one component at a time.
We've all had success, borne from experience, of good fault finding that determines the root cause immediately; but every now and again we have to go back to basics and do the 'change out one component at a time' routine to find the problem.
It is a hard way to fix it, but there are only a limited number of parts and you WILL find the problem.
Best of luck .... keep your eye on the prize!

"dare to be great"

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02-10-2008 05:30 AM  10 years agoPost 13
MarshallB

rrVeteran

Middle Arkansas

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I've had the tail bobble from a Torque Tube that would not seat all the way into the delrin gears in the tail. Meaning, the TT was a bit too short.. Make sure you are using the metal TT and not the CF TT. The CF TT may be the problem if it has too much runout and the pins do not seat into both ends of the delrin gears front and rear. If you have any white dust in the tail case, that's a sign of a problem. Something to look at..

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02-10-2008 01:24 PM  10 years agoPost 14
S Bell

rrApprentice

Nova Scotia Canada

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HiGuntube,

Change the major modules from one machine to another. Pull the mast and head from one and try it, next try the tail boom assembly. Minimal fuss is expended to isolate the assembly area. Once you find it zero in on that specific area. Running around by trial and erros with no directional plan takes longer I find. Don't feel bad I've had the same issue.

If it is the head:

Something as simple as different blade grip spacing can cause vibration. While highly unlikely a difference in damper thickness or other screw up can cause this. Feeler gage between the pitch horn and the head block will gage that area. It should be less than .008". You can also check at the blade bolts with a clamp on DTI to see if the spacing is correct. Balance the head with blades attached using the flybar and drinking glasses. Balanced blades on an uneven spindle placement will cause vibration just as if the blades were crap. Turn the spindle with a wrench while the grips are mounted and look for wobble. Make sure the mast bearings are not preloaded and the gear mesh does not have a tight spot.

A boom shoved up the back of the machine too far will vibrate as will poorly loaded boom struts.The shaft could migrate and push on a pinion altering gear mesh. I always glue the shaft to the bearings and the holders into the boom, they may be tight when new but eventually they can move. That's why they have this building step in the manual.

You can verify a tail drive system out the window of a moving car. I shove an extra bearing block on the exposed end of the torque tube so it won't whip. Even shafts with a bit of wobble always ran smooth, the problem always lay elsewhere like with tail blades or bent metal output shaft or elsewhere in the main rotor.Good luck, I know how frustrating helicopters can be at times.

Stephen

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02-10-2008 03:31 PM  10 years agoPost 15
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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To keep it short, replace your main power switch and look at the entire power supply system.

I had the EXACT same issue. It turned out to be a faulty switch. Upon replacement, the issue was solved.

I guess it was coming in and out of fail safe at a very fast rate. I wrote it off as a result of very fast power on and off pulses to the Rx????

Don't come off the throttle untill you see your GOD!

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02-10-2008 05:36 PM  10 years agoPost 16
RCHelicopterGuy

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Michigan

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Guntube,

All I can tell you is that there is an answer. Just keep looking for it.

Stephen and Colin can tell you how much I chased my tail with my R90 last season. As it turned out, the cause of my problem was something that I'd have never expected, but there it was...

Consider it a growth of your diagnostic skills. The upside is, when you find your problem (notice the choice of words), you will have learned a great deal more about your helicopter, and that's never a bad thing.

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02-10-2008 06:03 PM  10 years agoPost 17
guntube

rrApprentice

Marietta Ga.

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I am trying to stay positive! Thanks for the moral booster! I need it!

Putting divots in the earth the hard way!

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02-13-2008 01:02 PM  10 years agoPost 18
helinelly

rrVeteran

st.helens england

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wobble
its a bitch,i have had this problem on other heli's.its ether,ready for this..blades,dampers,headspeed,swash bearing,:it could be any of these.its a pain in the butt when they shake.you can't rule out anything.hope you get it fix.regards helinelly

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02-13-2008 01:34 PM  10 years agoPost 19
guntube

rrApprentice

Marietta Ga.

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I will be flying it this weekend and run some more test to try to find the problem. I will let everyone know what I find or dont find.

Putting divots in the earth the hard way!

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02-15-2008 07:51 PM  10 years agoPost 20
guntube

rrApprentice

Marietta Ga.

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FINALLY FIXED!!!!!!You would never believe it, but it was the stupid head pin the whole time! I was sitting in the yard watching the bird shake on the ground and trying to think, what in the world would make the rotor head jack itself out of balance so bad and why does the shake come and go? Well I started to tear the head down again slowly and tried to think about my question. Looking at the head pin that the spindal passes through, I noticed that the hole cut for it had a sharp edge on it. This may be impressive machine work, but is this edge locking my spindal as it tries to turn the shaft? THE ANSWER IS YES! I just happen to have a 5/8 counter sink bit and my drill with me, so I chamfered the hole on both sides, washed the part off with warm soapy water to get rid of the shavings, re-installed it, and she now hovers like she is hanging from a string! Forward flight is slick as well! No matter what head speed! Just for giggles, I ordered a new plastic head which includes a new pin and wouldnt ya know it, the pin on the new head I ordered is chamfered around the hole where the spindal passes through. Any body need some raptor parts? Flown only once or twice, and are like new!

Putting divots in the earth the hard way!

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HomeAircraftHelicopterThunder TigerRAPTOR 90 › Pice of crap machine wont stop shaking no matter how much time and money goes into it! FIN
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