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HomeAircraftHelicopterAlignT-REX 600N › 600 n pro fin vibrating violently
04-03-2009 01:23 PM  9 years agoPost 1
Ragz

rrApprentice

India

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This is a crashed and repaired 600n pro. I have changed the main shaft, spindle, flybar rod, boom, torque tube, torque tube front gears (both), new tail and main blades. I just came back from the field and after test flying it (hovering) I found the tail fin vibrating very violently...almost seemed like it will tear apart. There is NO foaming of boiling in the fuel tank...its only the FIN. I have no clue where to begin troubleshooting. Any suggestions?

thanks

PS: The main gears were not replaced.

Anurag

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04-03-2009 02:23 PM  9 years agoPost 2
JJMAN (RIP)

rrVeteran

Chesapeake, Virginia - USA

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Possible causes:

-Rich needle
-Fan/Clutch stack misalignment/imbalance
-Torque tube not straight
-Tail shaft bent
-Bad bearing somewhere in tail

JAY HIGGS

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04-03-2009 02:49 PM  9 years agoPost 3
hdskullfire2

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Bethlehem, Pa.

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Did you change the tail rotor spindle or at least check to see if it's still tru?

Steve

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

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04-03-2009 03:00 PM  9 years agoPost 4
Ragz

rrApprentice

India

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I did check the tail rotor spindle the best I could. By rolling it on a glass table. Seemed ok to me. Maybe I need to recheck?

Anurag

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04-03-2009 03:28 PM  9 years agoPost 5
Heli 770

rrProfessor

USA.

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Also check the tail blades for balance.

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04-03-2009 03:38 PM  9 years agoPost 6
Ragz

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India

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I have the tail rotor spindle out.. and it rolls perfectly on a glass table (edge)... seems its factory straight. I reckon its an engine /clutch/liner/fan issue... I remember on impact, the engine went to full rpm and stayed ON until I cut the power. May have ruined the liner or something...?

Anurag

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04-03-2009 04:51 PM  9 years agoPost 7
Ragz

rrApprentice

India

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After the crash I bought the Align plastic tail blades and now I have read somewhere on RR that they are horrendous. I will try the "new" carbon tail blades tomorrow. I just hope i can fix this... I am tired of tweaking it now.

Anurag

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04-03-2009 05:01 PM  9 years agoPost 8
JJMAN (RIP)

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Chesapeake, Virginia - USA

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I doubt its the plastic tail blades but it worth a try.

JAY HIGGS

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04-04-2009 04:11 PM  9 years agoPost 9
Ragz

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India

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I have figured out the problem. Its the torque tube front gear drive assembly... the umbrella gear. When installed in the casing, with the two bearings, this umbrella gear is not rotating TRUE. There seems to be a lateral play in the "PLUS" slot. I cannot understand how this has come about. Unless the bearings have been installed at an angle, slightly crooked. Its a fibre bearing, and I dont know how to ensure that the bearings slide in straight. From what I know, they are straight. However there is a lateral play, so THEY ARE NOT straight. Seems virtually impossible to make this accurate sitting at home with no fancy machines...

This is my first tube driven heli, seems like it will be my last... Tolerances are really small here. One micron here or there, and it goes out of whack.

Anurag

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04-04-2009 04:25 PM  9 years agoPost 10
baddynergy

rrElite Veteran

sierra madre, ca- usa

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That shouldn't be too much of a problem, there is play in the gears. I would also check to make sure your TT tube is straight and the bearing is 23cm forward of center.

the thing with the Align TT is they are very soft. If you just grab it and push it into the boom it bends real easy. The best way to install it is to get a plastic sleeve (like the one the TT comes in) and slide it over the TT and push it in gently with the bearing. Its good to lube the inside of the boom with some silicone spray so it slides easy.

Also check the thrust bearings in the tail grips. They have been known to be oversize preventing proper rotation. Its usually the outer race that is the culprit. The cure is to gently file the outside to where it slips into the grip easily.

**Unattended children will be givin a shot of espresso and a puppy**

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04-04-2009 04:47 PM  9 years agoPost 11
Ragz

rrApprentice

India

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The Torque tube "seems" straight. Again, i rolled it on a glass top. I am actually concerned about the umbrella gear NOT rotating true. It is moving funny... Is there a possibility that it might be warped? The lateral movement of the umbrella gear PLUS HOLE is getting transferred on the Torque tube and that is being transferred to the tail fin etc...

Anurag

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04-04-2009 04:56 PM  9 years agoPost 12
baddynergy

rrElite Veteran

sierra madre, ca- usa

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Is there a possibility that it might be warped?
Its more than likely drilled wrong. Just get a replacement set then you also I have spare gear.

**Unattended children will be givin a shot of espresso and a puppy**

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04-06-2009 11:20 AM  9 years agoPost 13
Ragz

rrApprentice

India

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I am having a horrid time getting the torque tube gear drive to work properly. After changing the umbrella gear, the entire installed assembly is not aligning properly into the tail unit... there is a lot of friction between the vertical and horizontal bevel gears.

Anurag

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04-06-2009 11:35 PM  9 years agoPost 14
deisel

rrApprentice

north carolina us

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rags change it over to belt drive and never look back.thats what i did i got feed up with the tt tail vib chase.

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04-07-2009 12:15 PM  9 years agoPost 15
Ragz

rrApprentice

India

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hmmm... i was actually thinking on the same lines....

HOWEVER....

I have a trex 700 on order as well... Its due to arrive in the LHS next week... Now I am wondering if I should get that or not, as thats also tube driven. So confused.

Can you list out the part numbers for a belt conversion please?

Thanks in advance

Anurag

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04-07-2009 02:37 PM  9 years agoPost 16
Ragz

rrApprentice

India

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I read somewhere that the torque tube, if pushed too hard inside the tail boom can cause problems, so I have pulled the boom by about 1 mm and the problem still persists. I have since the crash changed the following items:

main mast
feather shaft
flybar rod
boom
torque tube
metal fan (upgrade)
umbrella gears in the tail rotor assy

Needless to say the main and tail blades as well.

I havent changed:

Tail rotor spindle
Clutch
clutch liner
frames
main gears

Basically, the items not changed seem untouched and good.

What I am getting is FIN VIBRATION.... Increases on idle 1/2. I am now out of ideas, except changing even the unchanged parts...or simply moving to belt drive (cheaper now). If only I could figure out the reason....

Anurag

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04-07-2009 04:57 PM  9 years agoPost 17
TT2

rrApprentice

Nakhonsawan Thailand

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Are your tail blades going the right direction? Seen it happen...tail vibes like crazy, serious loss of tail authority. Easy mistake to make.

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04-07-2009 05:40 PM  9 years agoPost 18
Ragz

rrApprentice

India

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yes tail blades are correct. I have great tail authority...

Anurag

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04-08-2009 04:06 PM  9 years agoPost 19
Ragz

rrApprentice

India

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I attached my trex pro boom (tt version) to another belt driven trex sport that i recently built. No vibrations.

I guess these were indeed engine/fan/clutch related issues. Any suggestions on how to figure out whats wrong? The fan is a new metal fan.

Anurag

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04-08-2009 06:50 PM  9 years agoPost 20
uncleTy

rrApprentice

Memphis,TN.USA

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600 vibration
This may sound trivial but I changed head dampeners and lube on feathering shaft it stopped my vibration. (VALVOLINE AXLE GREASE) from auto parts store.

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HomeAircraftHelicopterAlignT-REX 600N › 600 n pro fin vibrating violently
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