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HelicopterHIROBOOther › Evo 50 vibration
08-06-2007 04:00 PM  10 years agoPost 1
phattalon

rrApprentice

Muncie In

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Please help me! What I have is an evo 50 all stock and I have a vibration that I can not track down. I have balanced the blades which are sab, I have changed the mainshaft and spindle. I even pulled the head an balanced it, and it was dead on. I can not figure this out, and if i dont i will not be flying at ircha other that my 450. Please help me i am beging you! Lol

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08-06-2007 04:11 PM  10 years agoPost 2
BLUETHUNDER

rrVeteran

Glass City

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What parts are vibrating?
Tail fins?
Canopy?
Skids?
Fuel Tank?

Did you balance your fan?

Did you dial indicate the start shaft?

Has this heli been crashed?

Did you check all bearings?

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08-06-2007 04:13 PM  10 years agoPost 3
phattalon

rrApprentice

Muncie In

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Yes i had crashed it once but the vibration showed up way after that. I am seeing the vibration in the fueltank and the canopy and it is affecting the 401. No i have not balanced or dial indicate anything, exept the head main and tail blades.

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08-07-2007 02:47 AM  10 years agoPost 4
Leif

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USA

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Things to do:

1. Drop the engine and dial-indicate the clutch/start shaft. If this shaft is not centered you will get high-frequency vibrations resulting in fuel foaming and a gyro that refuses to hold the tail.

2. Check the frame for crash damage. If you are seeing canopy vibrations then something is moving quite a bit. Sometimes it isn't that easy to find frame damage, especially where the main frame and servo frame meet.

3. Make sure the screws are tight that hold the servo frame to the main frame. While you are at it, check that all the frame screws are also tight.

4. Other than this, it's a matter of checking all the shafts. The spindle is the easiest shaft to bend even without crashing.

Leif

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08-07-2007 03:36 AM  10 years agoPost 5
phattalon

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Muncie In

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Thank you. I will check the start shaft and all the bolts.

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08-07-2007 12:36 PM  10 years agoPost 6
Turkana

rrKey Veteran

Montreal,Quebec ,​Canada

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Hi

Also check your tailshaft, maybe you touched during landing and did not notice. it may be just bent very little but that already can cause vibrations.

Reagrds Pete

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08-07-2007 03:16 PM  10 years agoPost 7
BarracudaHockey

rrMaster

Jacksonville FL

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My money is on the start shaft.

Andy
AMA 77227
http://www.jaxrc.com

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08-07-2007 06:32 PM  10 years agoPost 8
phattalon

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Muncie In

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Baracudahockey that is what i think also i never checked it. I will when i get off work and get to the ama.

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08-08-2007 06:49 AM  10 years agoPost 9
phattalon

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Muncie In

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Well it is not the start\clutch shaft, or the tail output shaft, main or spindle. I am now lost. Any other options?

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08-08-2007 11:55 AM  10 years agoPost 10
mpafonseca

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Savannah, GA - USA

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Probably you already checked it but is the engine running as before? Have you changed fuel, mixture, glow plug? Did you checked the fuel lines and filters (a very small hole can make the engine work rough). Have you played with the needles...?

Just trying to help

Good Luck

Marco

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08-08-2007 12:04 PM  10 years agoPost 11
RICH.L

rrKey Veteran

east springfield​p.a.

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how about the metal center hub being bent?

I had one recently that was bent from a crash.
rich

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08-08-2007 02:37 PM  10 years agoPost 12
ckoelliker

rrElite Veteran

St. Simons, GA

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Bad rear bearing?

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08-08-2007 04:35 PM  10 years agoPost 13
BLUETHUNDER

rrVeteran

Glass City

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Did you balance the fan?
Have you checked all bearings??

At this point after completing 100% listed above
I would try replacing the metal center hub part
# 0412 - 105 FZ - 3 center hub as Rich L
suggested and replace the SD tail part
#402 - 597 SD tail housing that the tail grips
bolt on to, as this heli has been crashed before.

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08-09-2007 05:26 AM  10 years agoPost 14
phattalon

rrApprentice

Muncie In

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RICH.L has it it is the aluminum center hub has just the slightest run out, and i the hight side was to lead and low to rich. I like just pluging a battery in. LOL

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08-09-2007 01:02 PM  10 years agoPost 15
RICH.L

rrKey Veteran

east springfield​p.a.

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leif is the one who told me about the center hub bending,just look at my post trying to figure out a tail drift and vibration.

http://www.runryder.com/helicopter/t356602p1/

also be sure to check the servo tray screws,I think that may be why my gy401 was going nuts.(seems someone forgot to tighten them up after the rebuild)

rich

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