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HelicopterAlignT-REX 600N › Tail Vibration, where to look?
03-16-2009 02:21 PM  8 years agoPost 1
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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Hi All

I have my 600N sport, been flying nice up until the weekend,Never crashed, firstly the sensor in my CSM Gov expired and I thought the engine had gone lean, but soon sussed the gov had stopped working, But

now the heli seems to have really bad end of tail vibration, the vertical fin is vibrating so much I thought it may touch the tail blades, I have tried different head speeds, and not much change. I did find the little see-saw bit that takes the rudder control from the front and joins to the rear wire, that had come loose, after loctiteing it back on the vibration lessened a bit, but is still there. fuel in the tank is very smooth not a ripple, but I have noticed a small amount of vibration in the skid tubes too..

could it be warped fan? and that took out the gov'ner sensor? or what else should I look at? this it a belt drive and not been crashed..

thanks

Cliff

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03-16-2009 03:02 PM  8 years agoPost 2
jsenicka

rrProfessor

Eagle River, WI

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Vertical fin vibration is engine related in most cases. Look at engine bearings, fan, clutch stack, start shaft, etc

Jim Senicka
Team Manager, GrandRC Flight Team

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03-16-2009 03:30 PM  8 years agoPost 3
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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engine has new bearings, but I think there maybe something going on in that area, time for another strip down.

Whats the best way to check the balance of the Fan/clutch assy

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03-16-2009 08:12 PM  8 years agoPost 4
Rcarnes

rrApprentice

mustang, ok. USA

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with a hi-point balancer. Just tale the whole clutch stack, set it in the balancer and give it a slight spin. the light side will stop in the up position, mark it, rotate the clutch 180* and try it again. mark the light side and take out some material from the heavy side until balanced. sometimes just rotating parts will take most of the balance issue out of the fan clutch stack.

R. C.
I dream of the day when a chicken can cross the road without his motives being questioned.

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03-16-2009 09:08 PM  8 years agoPost 5
baddynergy

rrElite Veteran

sierra madre, ca-​usa

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Also look at the torque tube. The 600 is pretty bad for finding straight ones. I have had a modified raptor 60 tube in mine for the past year and a half and have not had a TT problem since.

Its easy to bend the stock one putting it in. If you have to force it at all you probably bent it.

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

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03-16-2009 10:27 PM  8 years agoPost 6
Anthony.L

rrElite Veteran

Seattle, WA

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Also look at the torque tube.
This was my first thought when reading the subject. However he says his 600N is a Sport, which I took it as meaning he has a belt tail and not TT.

If not TT, then I would also look into the motor and/or clutch stack/fan out of balance.

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03-16-2009 10:58 PM  8 years agoPost 7
baddynergy

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sierra madre, ca-​usa

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This was my first thought when reading the subject. However he says his 600N is a Sport, which I took it as meaning he has a belt tail and not TT.
Good catch. My old tired etes and mind dont always see good..

Yup check for balancing and dial indicate the entire clutch hub assembly.
could it be warped fan?
Stock plastic fan?? if so, it very well could be.

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

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03-17-2009 11:18 AM  8 years agoPost 8
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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Maybe sussed it, the sensor died as it has been rubbing on the fan, but only in a few spots which would indicated the plastic fan is warped...metal one ordered, and new sensor, hopefully that'll fix it

My whole idea of getting a sport was because I hate tube drives, so expensive if you crash and more problems than a belt, slight touch with the tail blades and there goes the gears, a belt my just jump a bit but survive, and for my style of flying wooden tail blades would be fine too

I love my 600n even better now I have the ceramic bearings, million times better than stock, they last and last...nice

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03-19-2009 02:13 AM  8 years agoPost 9
JWatson

rrKey Veteran

Mustang, OK

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I know that you mentioned the fuel is not Foaming or sloshing, but If there is Fuel "Foaming" in the tank that is more than likely a HF Vibration coming from the Engine, Clutch Area. Something with a Higher RPM.

If the Vibration is more present on the Fins, Canopy, Skids area, it is more that likely Airframe Related, or something spinning at a lower RPM.

For sure check the Auto Hub, as well as the tail hub, and tail output Shaft. Maybe even try a set of new tail blades?

Hope that helps some,

Jarrett

Jarrett Watson
http://jarrettrc.wordpress.com/

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03-20-2009 02:32 PM  8 years agoPost 10
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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Thanks for that

I have my new fan and sensor, I shall be installing them this evening, and testing it over the weekend I hope its all fixed..

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03-24-2009 02:25 PM  8 years agoPost 11
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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Well it all works better, but the mixture seems to have quite an effect on the vibration too, I have now set the head speen on a switch, so i can adjust it or turn it off until I can get the mixture right.

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03-26-2009 04:21 AM  8 years agoPost 12
jasnlemons

rrVeteran

upstate, SC ​United States

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might also need to check bearings on both ends of tail. Possibly tail belt too tight can cause bearings to wear. And a slight bend in the tail shaft will cause a vibration. Just some more points to look at.

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03-26-2009 09:30 AM  8 years agoPost 13
cliffbarrimore

rrApprentice

Welcome Bay,​Tauranga, New​Zealand

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Yes
I have been thinking of the tail and possible problems, it looks to be OK , but I may just pull it of and have a look at the shaft and bearings

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HelicopterAlignT-REX 600N › Tail Vibration, where to look?
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