Getting really fustrating now!!!

[Eckchaz]

Eveing all,

Some of you may have came across a thread by me last month about "acceptable vibrations" on a Nitro as my 600 has some bad tail vibes.

Well, I've dismantled my 600 and I noticed something weird when I took the engine out.. there was some burnt stains around the fan and the top off the carb and there was a gauge out of the top of the carb aswell.. this wasnt there before and what could have cause this??

I've had a dial gauge delivered and dialed in the fan within 0.002 tolerance, then triple checked everything again... Put it back together took it out and started her up, left her on the ground idling.. guess what.. still got vibrations .. it still feels like its coming from the engine and the vibes travel to the furthest end point.. the tail.. and the tail blade is going mad aswell as the tip of the fin!

I cant work out what else I can do to stop this.. unless I am being overcautious about something thats normal, but because off the previous thread, I didnt think this was the case!

I want to get this sorted before it causes bigger problems! As I'd like to keep this Nitro Heli but if it does cause a inflight failure.. its getting sold for 600E. So any suggestion?

[Boggy]

didn't see your previous post

is the engine new or s/h are the bearings ok??

[hanson]

Hi Eckchaz,
I had problems with vibes on the 600n, I ended up buying a whole new kit and it still had the same vibes. Never really got to the bottom of it. The vibes I was seeing were high frequency vibes in the fin and also in the nose/canopy especially noticable on a slow piro.
I see you are in MK, Im close to MK, where abouts do you fly? The electric heli's definately have some advantages, downside is still the flight times imo.

Rich

[Eckchaz]

The engine is new 55HZ... only 3 gallons throught it and it still looks new (no brown stuff) and the bearing are OK.

[Eckchaz]

Hi Eckchaz,
I had problems with vibes on the 600n, I ended up buying a whole new kit and it still had the same vibes. Never really got to the bottom of it. The vibes I was seeing were high frequency vibes in the fin and also in the nose/canopy especially noticable on a slow piro.
I see you are in MK, Im close to MK, where abouts do you fly? The electric heli's definately have some advantages, downside is still the flight times imo.

Rich

Hi Rich,

Mines not High Frequency vibes.. its just annoying ones! So have you just learnt to live with it?

I've got a friend that lives in LB so I know your close.. I dont fly the 600 in MK.. I only fly it in Nptn on a private field (as my other house is in Nptn) but the electrics get flown in the field next to my place here in MK.. its a disused horse field (fenced off from public) about 2/3rd size of a football pitch.. its very convieniant as I open the front door and got my own flying site with no worry of people, dogs etc!

If your looking for a site, I can recommend MK heli club.

[tonystevens]

Have you tried changing the fan hub?
I spent weeks chasing a vibe on one of my 600's and it turned out to be that.
also check that your clutch is seated properly and check that the clutch itself hasnt become warped,ive had that happen and its hard to see but look at the side profile of the clutch and check that the parts that grab the clutch bell are inline with the clutch itself.

[Eckchaz]

Have you tried changing the fan hub?
I spent weeks chasing a vibe on one of my 600's and it turned out to be that.
also check that your clutch is seated properly and check that the clutch itself hasnt become warped,ive had that happen and its hard to see but look at the side profile of the clutch and check that the parts that grab the clutch bell are inline with the clutch itself.

The clutch is a new Lynx one.. checked today and its not warpped.. this is going to sound stupid but even on the dial gauge, its uniform each side.

I'll try a new fan hub.. are you using longer screws on the main hub to aid balance??

[tonystevens]

The clutch is a new Lynx one.. checked today and its not warpped.. this is going to sound stupid but even on the dial gauge, its uniform each side.

I'll try a new fan hub.. are you using longer screws on the main hub to aid balance??

Everything was standard

[hanson]

Hi Eckchaz,
No I stopped flying the 600n altogether, mostly because of the vibes. Recently I've been flying the 450 pro which I can fly as you say in the fields next to me without too much bother.
Not looking for a site to fly, just saw you were local and wondered where you flew, I mostly fly at manor farm - north mk (just past wolverton)
If the vibes you are seeing are inconsistent and showing as twitching on the tail, I would be looking at engine tuning/gyro mounting, what pipe are you running?

Rich

[electricsceadu]

check/change the rear bearing on the 55
it the usa a few have reported bad rear bearings from new causing vibrations

[Eckchaz]

Rich,

I'm using a Align 50 pipe.. engines tuned in and running fine.. so its not from running "rich"

Electric sceadu,

I did check the bearings and they seem ok? Theres no play or rattle in flight?

[electricsceadu]

from what i've read they don't rattle nor can you find any play
they just cause a vibration

[Eckchaz]

Well, I've changed the hub and fan.. dialled them in (but not as good as the old one.. the fan is 0.0025 out instead of 0.002)

The Vibes have calmed down but its still there... heres a vid so you can see what i'm talking about.. now am I being over cautious or is there a problem I need to sort??

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

[tonystevens]

Hard to tell from that vid as it made your tailfin look as if it was loose
Imo theres nothing to worry about there,ive had a couple 600's and they both did that at idle.
Align tail grips have a bit of sideways slop so they are bound to show a bit of movement when the engine is idling
The only things that could cause vibration at idle are the engine,fan mount,fan and clutch so if your still bothered start looking at those
Does the tailfin vibrate in the hover?

[Eckchaz]

Hard to tell from that vid as it made your tailfin look as if it was loose
Imo theres nothing to worry about there,ive had a couple 600's and they both did that at idle.
Align tail grips have a bit of sideways slop so they are bound to show a bit of movement when the engine is idling
The only things that could cause vibration at idle are the engine,fan mount,fan and clutch so if your still bothered start looking at those
Does the tailfin vibrate in the hover?

I've upgraded the tail to KDE V2 bearing kit to take away the slop. The fins are tight. I added an extra set off TT bearing with rubber holder, changed the metal fan to another one, changed the fan hub, got a Lynx clutch. brought a dial gauge and dialled it all in, tripled checked everything and it clamed down but was still there!

Your the 2nd person tonight to say its ok.. and its because, its the first nitro I own, so I thought something was wrong!

The tail & blades was a blurr at first and it still blurred in flight.. but after changing the parts and seeing it calmed down to whats in the Vid.. I'm sure theres hardly going to be anything in flight.. I'll get a spotter and see what happens at the weekend!

Thanks for your replies.. Nitro novice is now happy that its normal!!