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HIROBO Turbulence - SDX - Freya - Sceadu > High speed vibration
 
 
rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		Hi guys,
I have an evo 50 with a really high speed vibration. The horizontial stab is vibrating so bad that it looks like it is trying to take off, and yesterday I actually lost a glow plug that I am blaming on the vibration.
Here is what i have done so far. I found both the tail shaft and the rotor housing that hold the blade holders were both bent. I replaced both of them new, and made sure tht the belt was snug when I reassembled it. The boom supports are tight. Now I am out of ideas and want to know if any of you guys have had this problem, and what other areas can I look at to track this vibration down.
Thanks
rich
05-14-2005 Over year old.
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mkeigwin
Senior Heliman
Location: Marietta GA usa

My Posts This: Topic  Forum		have you checked your tail blades yet . also just did my evo and found that the hub and fan where out real bad . then it was .008 out on the starts shaft also . this is where i would start to check bal fan then dail the starts shaft .
05-14-2005 Over year old.
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rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		The tail blades were new also. I forgot to mention that. I guess I will pull the engine and look at the shafts to eliminate that part of it.
05-14-2005 Over year old.
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mudbogger2
Key Veteran
Location: Hoschton,Ga.

My Posts This: Topic  Forum		Have you balanced the tail as an assembly? Hub, grips and blades all at one time. Also just because you got new tail blades does not mean they are balanced. Check them as well.
05-14-2005 Over year old.
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rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		OK Mud I will try and ballance and give this thing a once over. Again you can't believe just how fast the horizontial stab is vibrating. It has to be a high speed vibration to make it vibrate this fast.
05-16-2005 Over year old.
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bird1100xxy
Heliman
Location: Swindon, UK

My Posts This: Topic  Forum		I have exactly the same problem. I have recently changed the main shaft, feathering spindle and cooling fan for the quick UK upgrades, athough without the facility of balancing the cooling fan. I have also installed the NHP cooling shroud extension, but the vibration is still there. I have also just purchased the DTTS main and secondary gears but once installed I suspect the vibration will still be there. However, my immediate thoughts are now pointing towards the main rotorhead. I have noticed that after taking out the old main gear, just prior to replacing with the new DTTS main gear, I unclipped all the linkages from the swashplate and spun the rotorhead freely with my fingers and although the heli was very still the rotorhead button spun off centre from
side to side. If the horizontal bolt which holds the rotorhead to the mainshaft is loosened I can manually reposition of the tilt angle of the rotorhead and eliminate the off centre spin of the rotorhead button. However, after retightening the rotorhead to the mainshaft the off centre spin comes back.
05-26-2005 Over year old.
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marc8090
Key Veteran
Location: Long Island, N.Y.

My Posts This: Topic  Forum		It may be a bent center post. I have this issue of the fins buzzing on my Freya EX and there have been many posts on it. Even though it seems like it should be engine or tail related guys have found it to be main rotorhead related somehow. I'm stubborn though and so far I have installed a new engine, fan hub(which is balanced), clutch, bearings, dial indicated the fan hub less than .001, the bottom of the clutch shaft at .000, and the top of the clutch shaft at 1/3 of .001. The buzz is still there. I tried two sets of main blades, 3 pairs of tail blades, and it's still there! Next I will replace the tail shaft and hub and see what happens. Then I will move on to the main rotor head.
05-28-2005 Over year old.
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Professor Fate
Key Veteran
Location: Goose Creek S.C.

My Posts This: Topic  Forum		How are the TR blades tracking. I know it sounds silly but you never know.

Welcome my son, Welcome to the machine
05-28-2005 Over year old.
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craneyum
Key Veteran
Location: warwickshire uk

My Posts This: Topic  Forum		Hi all just caught this thread and thought id let you all know what ive been through.
We had an evo 50 that was flying perfect one minute then over a couple of weeks was vibing so bad that it blew three tail cases, two tail hubs and four booms.
Also caused two crashes so on rebuilding useing most of the parts from the crashed heli, taking into consideration that before this the heli hadn't been crashed, i changed the clutch ,mast and starter shaft bearings and the headblock.
All the parts off the tail were reuseable apart from the boom.
Anyhow the vibes have gone and im a happy chappy but i didnt locate exactly where it was comeing from.
So now im going to backtrack one step at a time to find out what it was.
What was do distinctive about the vibes is that it made the heli have a completely different tone.
Ill track down this culprit and let you know what i find.
Nigel

Learn By Other Peoples Mistakes It Costs Less
05-28-2005 Over year old.
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cmbheli
Heliman
Location: Columbus Ohio

My Posts This: Topic  Forum		I just got done chasing the same problem.It was the center hub on the main shaft.Check it!!!!You might be suprised.

Chris Bissel
05-29-2005 Over year old.
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marc8090
Key Veteran
Location: Long Island, N.Y.

My Posts This: Topic  Forum		Was the center hub on an EVO or a Freya? That's what I'm leaning towards, it just doesn't make any sense. If that's what it is I'll be relieved and pissed at the same time.
05-29-2005 Over year old.
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DoTheDew
Heliman
Location: Covington, GA, USA

My Posts This: Topic  Forum		I had the same problem and found it to be several things: I had a bent hub on the main shaft, a bent tail shaft, and a bent tail hub. One other problem was the two sprockets that the belt drives had pieces of rubber built-up inside them (hard to see), but definitley will throw off rotation. Belt tention may play a role in it as well...a good rule of thumb is to move the belt from either side of the boom to the center of the boom behind the sprocket on the heli itself.

Thanks,

Keith

C. how U. R.
05-29-2005 Over year old.
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cmbheli
Heliman
Location: Columbus Ohio

My Posts This: Topic  Forum		It was the center hub on the evo.

Chris Bissel
05-29-2005 Over year old.
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marc8090
Key Veteran
Location: Long Island, N.Y.

My Posts This: Topic  Forum		Thanks, I think that's the problem on my Freya. What makes me wonder though is that mine has done this since the first second it left the ground, so if my center post is bent it was not from a crash or being bent in flight, it would of come out of the kit that way.
05-29-2005 Over year old.
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rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		CM,
What do you mean by the center hub? Are you talking about the spindle or the main shaft?
Rich
05-29-2005 Over year old.
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cmbheli
Heliman
Location: Columbus Ohio

My Posts This: Topic  Forum		On the evo it has basically a two piece headblock, the aluminum center hub and the plastic rotor head.It could have done it from the begining as well.As I installed a new one on, I first put the center hub on before anything else and checked the run out. Having the bolt going through, there is a slight chance for it to move left to right. This is were you can fix the problem before it becomes one.

Chris Bissel
05-30-2005 Over year old.
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rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		Here is another thing that I am noticing. I have the blades off of the evo as I am going to change the servo tray( UHG)., as I spin the head I can hear the tail belt hitting the inside of the boom. I know that the evo dose not have the guide rollers like the raptor, but should I be hearing the belt slapping the boom inside? the belt seems to be tight.
Can I have the belt double twisted or is this normal to hear the belt bang around in the boom?
Rich
05-31-2005 Over year old.
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RussR
Senior Heliman
Location: Tampa, Florida

My Posts This: Topic  Forum		Vibration

I have converted my Freya to my Avant and chased down a vibration like this. It turned out to be the main hub. I will add though that the cheap plastic tail blades will add to the misery even if they're balanced. I had some remaining vibes (very slight) and changed the blue blades to carbons and it's now smooth as glass.

The belt tension should be relatively loose, as opposed to drum tight. As long as it doesn't skip when you turn the head, you may still hear the belt insided the boom.

Good luck,
Russ
06-02-2005 Over year old.
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Professor Fate
Key Veteran
Location: Goose Creek S.C.

My Posts This: Topic  Forum		can't remember? Did you have the boom off? The belt isn't twisted more than 90 degs. is it? If it is the bad vibs could be the teeth on the belt rubbing together?

Welcome my son, Welcome to the machine
06-02-2005 Over year old.
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rpat
Veteran
Location: Weirton, W. Va.

My Posts This: Topic  Forum		I changed the servo tray yesterday and put every thing back together and fired it up and it is as bad as ever. Called a buddy in my club and said to ta
ake the tail holders off and see if every thing is ok. Weeeeeeellllll when i changed the tail hub a couple of weeks ago I reversed the thrust and roller bearings. This has got to have some effect but I am not convinced that it is the total solution. I am kind of leaning on the bent hub. I had zigsaw blades on it originally and after the crash I put TT's on it. I have a set of woodies that i am going to try and see if the different blades make difference
Oh buy the way I made it sound like the servo holder had something to do with the vibration.......it dosen't ....but I wish it did
06-02-2005 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > High speed vibration
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