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HomeAircraftHelicopterHelicopter Main Discussion › Tail Intermittently Kicking on Whiplash 90N
05-29-2015 06:07 PM  3 years agoPost 1
rudyy

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E. Amherst, NY

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What could be causing the tail kicking intermittently clockwise 30 degree during hovering? The heli is Whiplash 90N with BeastX. I have checked the whole drive train and cannot find one missing tooth.

Rudy

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05-29-2015 08:12 PM  3 years agoPost 2
don s

rrElite Veteran

Chesapeake, VA

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I vote tail servo going out.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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05-29-2015 09:28 PM  3 years agoPost 3
kthane

rrVeteran

Pensacola

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+1 for tail servo.

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05-29-2015 09:29 PM  3 years agoPost 4
rudyy

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E. Amherst, NY

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OK.. will swap tail servo and see how it goes.

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05-30-2015 02:28 PM  3 years agoPost 5
JasonJ

rrKey Veteran

North Idaho

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Before pouring money into parts make sure your engine is tuned. A bit rich can make vibes which can make for interesting beastx behavior.

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05-30-2015 03:31 PM  3 years agoPost 6
Dr.Ben

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Richmond, VA, USA

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Agreed but even if he has to borrow a servo it would be good to check that first because most tail servos going south only warn you a few times, and then things get "exciting".

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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05-30-2015 04:25 PM  3 years agoPost 7
whoamis

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san francisco, ca

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Static hitting the FBL

oops, bounced it!

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05-30-2015 05:06 PM  3 years agoPost 8
rudyy

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E. Amherst, NY

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Just discover that the spektrum backplate sensor bracket is broken, causing the governor failing to hold a constant rpm; Not sure if that will cause the tail to act abnormally. So, will fix the sensor bracket first and see how it goes.

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05-30-2015 05:40 PM  3 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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governor failing to hold a constant rpm
That will do it.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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05-30-2015 05:58 PM  3 years agoPost 10
sharam

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Northern California - Fly at Morgan Hill Field

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Check the correct orientation of your tail thrust washers. If you assembled them in the incorrect order, you will see the tail kick as you describe.

Verba volant, scripta manet

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05-30-2015 08:24 PM  3 years agoPost 11
rudyy

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E. Amherst, NY

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Sharam, that is a good point. I will check that.

Rudy

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05-30-2015 10:02 PM  3 years agoPost 12
rudyy

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E. Amherst, NY

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The thrust bearings are correctly put and yet, I have a hard time taking out one of the blade grips. It is just stuck on the tail feathering shaft and cannot slide on it at all. I hope that could be the cause of the problem.

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06-10-2015 12:05 AM  3 years agoPost 13
rudyy

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E. Amherst, NY

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Still no good. I have fixed the spektrum rpm sensor bracket and lean up the mid needle by 1/8 turn. The engine has no pulsing anymore.

Yet, the tail is still kicking intermittently like a glitch.

Aside from fixing the engine pulsing, here is what I have tried:

- swap the complete rear tail assembly (except the torque tube shaft)
- swap a tail servo that I know it is good

All these do not help.

Is there some static built up somehow causing the tail to act that way even for a torque tube driven tail?

Any idea what I should look into or try next?

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06-10-2015 12:17 AM  3 years agoPost 14
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Fatten up low to see if it stops ,sometimes low is lean and inconsistent fuel delivery.

I stole it ,flew it and gave it back ;)

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06-10-2015 03:17 AM  3 years agoPost 15
Kelly Fairbanks

rrApprentice

Twin Falls Idaho

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Check the one way I have had them cause this !

Team Synergy Team Scorpion

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06-10-2015 11:13 AM  3 years agoPost 16
Richardmid1

rrProfessor

Leeds, England

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It's vibration. Balance everything particularly the engine fan and clutch and/or change gyro location or tape.

60% of the time, it works every time!

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06-10-2015 11:54 AM  3 years agoPost 17
MattJen

rrElite Veteran

UK

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Sometimes a main mast bearing going can cause a tail kick, in the old 35meg days it would lock you out, but I've found on my 2.4 machines when they get notchy it causes tail to kick...
Maybe just an idea before you start taking servos out... not sure how easy it is on your machine to check mast bearings.

I notice it's the MA whiplash,
I've had similar issue on my stratus, it was vibration coming from a number of sources..
Clutch driver not central, tail bearings notchy
And grips done up too tight,tail hub slightly bent from knocking whilst transporting /hangar rash maybe spin the tail up in a drill or something similar and feel for vibration.
As others have said a rough running engine can also cause tail kick, when did u last check engine bearings? Nitro kills them..

All The Best

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06-10-2015 01:12 PM  3 years agoPost 18
jbjones

rrVeteran

Columbus, Mississippi

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When my Whiplash did that, it was from the OWB slipping. It'll gradually get worse...much worse if that is your problem.

A quick degrease, and 2 drops of tri-flow (or ATF) will get you back to normal.

Good luck.

-JB

J. B. Jones

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06-10-2015 04:17 PM  3 years agoPost 19
rudyy

rrElite Veteran

E. Amherst, NY

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Thanks everyone's suggestions. I will focus on the main mast bearings and the OWB and will also check the FBL unit tape.

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06-10-2015 07:13 PM  3 years agoPost 20
rudyy

rrElite Veteran

E. Amherst, NY

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Just found one small thing.. the heat shrink tubing on the CF tail push rod end could hit/touch the bottom of the metal tail assembly sometimes when the push rod is moving. I start wondering if this slight hitting/touching would cause this kicking issue. Other than that, the whole tail push/pull is silky smooth.

I now put back the stock tail push rod without CF tubing and see if it works. If it still does not help, I will inspect the OWB and main mast bearings and then the gyro tape.

I have been troubleshooting this problem on and off for almost a month. It is very frustrating that I have to change one item one at a time to narrow down the root cause.

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