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T-REX 500 › Brand new T 500 that is shaking
03-31-2009 02:23 AM  9 years agoPost 1
nitronut

rrNovice

San Jose Ca.

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Hello there all

I have a new ESP that I finished building upon spooling up it has a small shake. I am running the Align motor, esc, and digital servos and a gy401 and futaba tail servo, a 6s 2200, and an AR7000. I have checked the CF main blades for weight and balance. I have rechecked the flybar and the paddles at make sure that they where centered. With out the main blades and the paddles on it the heli still shakes and i am running out of options. I don't know what to do. Any help or suggestions are welcome.

Thanks

what go's up must come down

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03-31-2009 02:33 AM  9 years agoPost 2
myaces

rrVeteran

North Bend, Wa

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Does it shake so much that you can't even get it into a hover? Even while it's on the ground how does the main blade tracking look?

Also, where does it shake and any idea of the headspeed?

Have you taken the spindle out to check it, sometimes with a new heli it seems the dampners can get in there at an odd angle and create the shakes.

~Team Collective Mayhem

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03-31-2009 03:07 AM  9 years agoPost 3
dkshema

rrMaster

Cedar Rapids, IA

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Does the shake occur only as you're spooling up, then disappear after you get some decent head speed, or does it just continue to shake no matter what.

If the thing shakes momentarily as you spin up the head, it's normal, and your blades were not lined up, the head is unbalanced. As centrifugal force as well as aerodynamic forces will eventually take over and force the blades out where they should be, the head should settle down and unless your tracking is way off or something's grossly unbalanced.

If the shaking is continuous, then you have something unbalanced, or something bent, or perhaps both.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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03-31-2009 03:08 AM  9 years agoPost 4
nitronut

rrNovice

San Jose Ca.

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I can hover it and the tracking looks good. It is a high speed shake and i can't tell where it is from. When I put in the dampeners I used a 2mm driver to make sure that they where seated and they looked ok.

what go's up must come down

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03-31-2009 03:14 AM  9 years agoPost 5
nitronut

rrNovice

San Jose Ca.

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the shaking stays as i spool it up not a lead lag issue and if there is something bent it came from the factory that way i have never tipped it or hit anything i just put it in a hover yesterday for the first time.

what go's up must come down

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03-31-2009 03:27 AM  9 years agoPost 6
Russell Bear

rrApprentice

League City, Texas USA

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Did you install the feathering shaft sleeve in the head?

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03-31-2009 04:54 AM  9 years agoPost 7
nitronut

rrNovice

San Jose Ca.

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Yes I installed the feathering sleeve and just got back from checking the feathering shaft to make sure it is straight. I also put in the brand new black dampeners hopping the gray ones where bad no luck. Does anyone else had this problem. I put it in a hover after changing the dampeners and landed it. Just under half throttle if i put my finger in the tail fin i can feel the shake. It is very small and fast shake. I have also noticed that the digital Align servos don't seen to center very well but i will know more when the shaking stop and i can put it in FF

what go's up must come down

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03-31-2009 12:57 PM  9 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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Torque tube maybe?
If the carrier bearing in the boom is way off center the TT can do the jump rope thing.

I literally never use the word literally right.

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03-31-2009 02:18 PM  9 years agoPost 9
Jamin_00

rrApprentice

Essex UK

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Check the main bearings,some have been known to be notchy from new.They should be ultra smooooooth

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03-31-2009 04:48 PM  9 years agoPost 10
nitronut

rrNovice

San Jose Ca.

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will check on those and let you know what i find. but it feels like something in the drive line. when i put my finger on the tail fin as it spool down i can feel some gears that are knotche i don't know witch ones. if i hand spin it i cant tell where it is coming from.

what go's up must come down

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03-31-2009 08:20 PM  9 years agoPost 11
hdskullfire2

rrApprentice

Bethlehem, Pa.

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I'm not sure of you experience level so forgive me if these questions seem elementary in context.

This maybe is a redundent question, but you said you checked the flybar and paddles for weight and distance from the center. Did you also by chance check to see that the leading edge of each paddle is traveling in the right direction? And did you also check to see the paddle is level with the flybar carrier? Phasing of the paddles or paddles not at the right angle of attack can cause vibration no matter what headspeed you are running at.

Steve

Your next stop, the Twilight Zone. Now get'a move on....Hey, get me a cold one first..!!

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04-01-2009 01:04 AM  9 years agoPost 12
himaxkeith

rrApprentice

Atlantic City NJ. USA

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I have been having the same problem with my ESP. Another thing to look at is the gear mesh between the main gear and the motor pinion. I had mine to tight and thought it would brake in but it seemed to be the cause of my vibration because everything else was checked and rechecked. And the instructions recommends to have a 1 mm gap between the two. My pinion was pushing on the main gear a little hard. When you turn the main gear by hand it started out smooth then got a little tight then smoothed out again. It made a little sense if it is to tight because it might not allow the one way bearing to center it self on the main shaft when it grips it causing the main gear to wobble also.

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04-01-2009 01:52 AM  9 years agoPost 13
Driverzwanted

rrNovice

Toronto, ON - Canada

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Had the same problem on my 500 ESP. Brought it to the LHS and they checked everything and after putting it back together we just tried placing some tape to better ballance the blades - then the shake was totally gone!!! The expert pilot just came in and he's greatly into 500's and told me that the stock Align blades aren't that balanced that great.
After a small crash afterwards, after a rebuild, there was that shake again - I ended up buying the stock Align baldes again (had a great deal) so I just played with some tape and the shake is now gone. I know. It's worth a try? Took me a bit to balance it correctly, but as I started to place the tape correclt, the shake started decreasing, so I jusdt followed that lead there.
Let us know what works.

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04-01-2009 09:25 AM  9 years agoPost 14
nitronut

rrNovice

San Jose Ca.

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Thanks for the replies I did not want to come off arrogant but I worked for Century for over a year and did all set up and the test flying on the Swift RTR prototypes. But you never know what people will with blades back wards and paddles thank for thinking of the dum stuff. Trust me I know from doing tech support for them. I still need to recheck the main shaft BB and the tail drive BB. I have played with the gear mesh and have not been able to get it to go away but I will re-look at it and if that dose not work I will try the tape on the blades. I did not get to play with it to night as I had school. I will check it tomorrow and let you all know what I come up with.

Thanks and keep them coming as I will find the problem.

what go's up must come down

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04-03-2009 06:52 AM  9 years agoPost 15
nitronut

rrNovice

San Jose Ca.

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Well no luck I played with the gear mesh. I put it where I thought it was right and way the hell out there but still it shakes. I rechecked the tail drive shaft BB right on the money 22.6 from one end and 24.1 from the other. I even played with tape on the main blades on ether one and on the inside on outer part of the blades, and still it shakes i can hear a gear mesh that does not sound right. I think it is the front tail gear box and the main drive gear. I am going to check the blade balance with my heli-max balancer but I have to wait till i go back to Ca to get all my stuff. I am moving to Wy to go too school. My other toys are there and a lot of my tools I don't want to buy a third one just to check these blades. If any one has any other suggestions I am all ears. If there is any on in the Mc Kinnon, Green River area that has one i could borrow i will bring my heli to them for five min with the balancer. LOL

what go's up must come down

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04-03-2009 11:01 AM  9 years agoPost 16
McKrackin

rrProfessor

Lucasville,Ohio

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Funny you mentioned the front drive gear for the TT.I had that same issue when I put in a new TT drive system after a violent crash.
It should be solved now though since the high winds I was playing in forced me down last night and I stripped everything with teeth down smooth.Just the gears this time.lol.I gotta stop flying so close to the ground all the time..lol.

I'll certainly let you know if the new gears smooth things out.

I literally never use the word literally right.

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04-03-2009 03:54 PM  9 years agoPost 17
nitronut

rrNovice

San Jose Ca.

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Mckrackin where you get a high speed shake out of your tail. I cant see the tail gear box moving but the tail fin is humming and i cant it to stop.

what go's up must come down

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04-04-2009 03:43 AM  9 years agoPost 18
nitronut

rrNovice

San Jose Ca.

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Here is the tail rotor hub I talked the HR and the tech guy said to try putting tape in one tail blade I did and it did not work but I found that there was play in the tail blade grips front to back. If i remenber correctly this is factory assembled. Never the less when I took it a part to inspect it the bolt snapped off. I also talked to align and they said that they have seen the front tail drive gears that did not fit right they put new ones in it and they fit right. I am going to order the gears and the tail hub. Does any one else have slop in the tail blade grips. Thanks

what go's up must come down

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04-04-2009 04:08 AM  9 years agoPost 19
McKrackin

rrProfessor

Lucasville,Ohio

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The tail blade grips fit sloppy on both my 500's.

I put a belt drive tail on today and the heli is rock solid again.
I guess I got a bad gear set last time.
I have the new gears in the mail but I may stay belt drive til I get these wide open stall turns a foot off the ground out of my system.
Stripping the gears in the tail is getting old.

I literally never use the word literally right.

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04-12-2009 08:47 AM  9 years agoPost 20
nitronut

rrNovice

San Jose Ca.

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I just got my parts yesterday I will put it together and let you all know how it works. I hope to god that the new gears fix this if not i will ship it to align for them to fix it.

what go's up must come down

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