Acceptable amount of vibrations??

[Eckchaz]

Try releasing the engine bolts until they are tight enough just to hold the engine in place, whilst tightening them up spin the engine with the plug out using your starter. Tighten the bolts on the diagonal and then try it again.

Sorry Dave I thought you meant something else? The way I read ^^ was to loosen the engine bolts from the engine mounting blocks (whilst engine is still in Heli) and to spin the engine.. etc etc.

Good link though.. more info to digest! What about the clutch or Clutch Bell, do you dial those?

I'm going to be a pain now... if a fan is not balanced but it has been dialed.. wouldnt a unbalanced fan still cause "wobble" and lead to vibrations? Also, lets say, I dialed in.. Both the clutch bell assembly and the fan but if mated the parts incorrectly, wont this ruin the work I just done and still cause vibes again?

Sorry for the million questions!

[waveydavey]

Sorry Dave I thought you meant something else? The way I read ^^ was to loosen the engine bolts from the engine mounting blocks (whilst engine is still in Heli) and to spin the engine.. etc etc.

Exactly what I meant, and different to dialing in the fan and hub assembly. I always spin the engine this way if I've had it out but only dial the clutch should I have changed anything. When you think about it the hub, fan, clutch and bell should all be good and very well balanced from the manufacturer, if you add just one magnet to the fan for example it is going to be un-balanced, you may not see it but it will be there. Using the dial indicator just checks that everything is concentric. In fact the only way you can change it with the 600 setup is to rotate the fan around a hole pitch, it's more of a confirmation that everything is okay. Checking to see whether the clutch is sitting at 90 degrees to the hub you can use small amounts of shim to level it up should it not be 100%.

Good link though.. more info to digest! What about the clutch or Clutch Bell, do you dial those?

I check the clutch but only the top face, as the leaves spring they wouldn't be concentric anyway. The bell is held in an assembly and relies on the starter shaft and one way to hold it centrally.

I'm going to be a pain now... if a fan is not balanced but it has been dialed.. wouldnt a unbalanced fan still cause "wobble" and lead to vibrations? Also, lets say, I dialed in.. Both the clutch bell assembly and the fan but if mated the parts incorrectly, wont this ruin the work I just done and still cause vibes again?

As I said above they should be very well balanced from new and I don't know anyone who has went to the lengths of balancing the whole assembly. A lot of the above is difficult to affect as it's done in manufacture, the only things you can check really are the bits that you have assembled. For instance I do the part tighten engine spin method with everything in the clutch stack including the starter assembly.

Hope you find it vibes are a nightmare and destroy things from within. Does the fuel slosh or foam at all? Can you see the cabin vibrating or is it just the tail. If it's just the tail maybe a bent tail shaft, bearings locked up in the tail hub etc.

[Eckchaz]

Exactly what I meant, and different to dialing in the fan and hub assembly. I always spin the engine this way if I've had it out but only dial the clutch should I have changed anything.

Does the fuel slosh or foam at all? Can you see the cabin vibrating or is it just the tail. If it's just the tail maybe a bent tail shaft, bearings locked up in the tail hub etc.

OK, I'm still confused (Sorry!) How do you dial the clutch with everything sitting in the heli? Do you remove the main gears and engine bearing block to do so?

I've noticed the vibes just on the previously mentioned parts. The tail fin and both tail linkage rods, nothing up front. Just another thought, Align only supply 1 TT bearing and considering the tail is so long, wouldnt it be benificial to buy another set and increase the support for the TT, and helping it run truer or is this pointless?

Vibes noticable is when idling and spooling up.. not paid attention to the vibes when in the air as i've kept the heli a at least 8 meters away to be safe and was concentrating on other things. I have mentioned before that the fuel does not foam but it does boil, I was thinking its the exhaust pressure (as its mainly happens during the first half of the tank) and the tank was fitted to tightly to the frame. So I was going to file down the frame to give it some grace and the mounting rubbers to absorb some of the vibes.

I'll got a busy day but i'll try and get out today to have a look, as I've not had the heli in the air since the last problems and the clutch change.

Thanks again Dave, you have been execptional with sharing the knowledge you have since I started this hobby! I definately owe you a few drinks!

[waveydavey]

The engine needs to be out as in the link Eddie, clamped in a vice on the engine mount lugs. To be fair this does seem to be tail related so I would probably leave the engine and clutch alone, I don't have too much experience with the TT so someone else may be able to shed light on this.

You will always have some vibration at idle and through spool up but this should disappear once your headspeed is achieved.

[Eckchaz]

Made some time this afternoon and put 5 tanks through it.

I dont think its because its running rich as I tuned the engine again.

Right...

When Idling on the floor - The Vibes are definately tail backwards. Mainly the bottom fin, the linkage rods for the tail servo and they make a noise. Infact its actually quite bad that the tail blade ends are buzzing too!

When spooling up - It calms down, but still noticable

When hovering Approx 1880 HS, Idle 1 Approx 2024 HS, Idle 2 Approx 2171 HS - All calmed down but tail fin still very noticable but its not vibrating as fast

Am I being over cautious.. I know its going to vibrate but I just dont know whats acceptable and I swear the tail shouldnt be like that when its sat on the floor?

Whats your thoughts??

[Eckchaz]

Heres a nice Vid of the Vibes.. Still got them dispite changing everything.. could my bearings in teh 55 have gone? Its only had 3 gallons and still looks new inside.. theres no play or rattle but Been advised they may have?

[ame=http://www.youtube.com/watch?v=VDbmVaq30-c]YouTube - Trex 600LE annoying vibes![/ame]

[waveydavey]

See PM Eddie.

[Eckchaz]

I have and many thanks Dave!

Being my first Nitro, I just didnt know!

[Nick B]

Looks pretty normal to me

[Eckchaz]

Looks pretty normal to me

Thanks Nick,

My Nitro novice shows , as a few people have said its normal now!.. gutted I spent hours and nearly £100 on parts and tools trying the git rid off it!!

[Swashbuckler]

It's worth changing the engine bearing, I did mine last week as I felt the heli wasn't as quiet as it should be. It still seemed to have good power, but I was warey because someone at my club had their bearing go after 2 gallons. Mine had done maybe 5 gallons. The difference is now unbelievable. So quiet in the idle, I sometimes wonder whether the engine has cut during autos.. (it hasn't). I tried the new SLV fuel in it before the bearing change and didn't notice any difference which was wierd as my 90s were very different on the new fuel. I tried the fuel again after the bearing change and the heli was ballistic. This is on a Velocity with an Align/OS 55 engine.

[Nick B]

You will get a natural small vibe with any nitro,only worry if its enough to foam the fuel in the tank

[Eckchaz]

You will get a natural small vibe with any nitro,only worry if its enough to foam the fuel in the tank

Definately No High Freq Vibes.. just this (to me) annoying ones!

Swashbuckler.. your not the only one to mention engine bearings.. someone else mentioned bearing problems from new but I feel I'm happy with mine.. I'll see how I go first as engine are new to me Running 20% coolpower since its first tank and know they are kinder to bearings than other fuel. I have checked the bearings and they have no play and they certainly dont rattle.

[waveydavey]

The engine bearings as they start to go have a tone all of their own. Trust me you'll know when they are on their way out. The back one suffers the worst and you can only feel that it's gone when it feels notchy, after you have removed it.