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HelicopterBeginners Corner › Procedure for tail rotor failure
09-11-2007 12:43 PM  10 years agoPost 1
naked painter

rrVeteran

Mid glamorgan uk

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Hi Guys

If the tail servo or tail rotors fail and the heli starts rotating during flight what is the best course of action to take? e.g can it be controlled and landed in a certain fashion?

Basically I attempted this on my sim and came to the conlusion that there's not much you can do.

Has anybody experienced this out in the field?

Thanks

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09-11-2007 01:02 PM  10 years agoPost 2
Wa11banger

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Huntsville, Al

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It depends on what the failure is as to what damage you can lessen.

For one practice autos they will definetly help you out.

Practice stationary piros, they will help you understand how to control your heli if the tail has mechanical failure.

For every instance of TR failure, work with the out of control heli to get it in a comfortable position. (Within reason if it is futile stop this early) Pull the throttle hold switch and control the descent of the heli.. Depending on the type of failure will depend on what happens here.. If you lost a link, or had some sort of linkage failure that isnt bound up.. The heli should stop piro'ing or at least slow the rate way down and you should feel a little more comfortable. Keep the forward speed so the tail stays behind the nose and only stop when you are about the complete the auto.

The second type I have experienced is some sort of bound failure where the servo failed or the TR mechanically failed hard over to one position. Pulling the throttle hold switch will reduce the rate of rotation but not stop it. You will have to think all the way to the ground and keep the heli skids down. If you have been practicing your stationary piros this will be easier..

Thats pretty much all there is to it.. There are a billion ways to fail your tail but the end result is the same, you are either crashing or autoing in.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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09-11-2007 02:30 PM  10 years agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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Basically I attempted this on my sim and came to the conlusion that there's not much you can do.
yes there is...continue practicing autos.

Give it more height and speed then bring downwind...the heli will point into the wind and the tail will stop spinning...giving you that chance to auto...if not going to make it...puch the throtle again and repeat...definitely takes practice but doable.

~~Enjoying the hobby one flight at a time~~

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09-11-2007 03:14 PM  10 years agoPost 4
BarracudaHockey

rrMaster

Jacksonville FL

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Well it depends on the failure and the tail drive mode.

A non driven tail such as the Raptor 30 should weathervane into the wind if you hit throttle hold.

A driven tail like the Raptor 50 and most other designs it keeps the tail spinning so unless the belt breaks you are riding a bucking bronco all the way in.

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

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09-11-2007 03:18 PM  10 years agoPost 5
Wa11banger

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Huntsville, Al

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The tail will not stop turning in every scenario.. Most heli's now days have constant drive tails meaning if the mains are turning so are the tails.

Stripped or damaged drivetrain torque tube, gear set, or belt problem will more than likely let a tail stop turning and/or remove tail authority and give you the weather vane affect in an auto.

Along the same lines a control rod failure will more than likely result in the tail blades going neutral and allowing a weather vane style auto but not always

A servo that fails could fail on any side and may not return to neutral this will not completely remove tail authority

Linkage binding or a slider malfunction can cause failure to one side or the other and will also not remove tail authority so the only thing you are reducing during the auto is the piro rate by slowing the HS down.

There are a bunch of ways to have a failure the above are just a few.. Practice flying, practice controlled piros both directions, and practice autoing and you greatly increase your chances of surviving a tail failure.

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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09-11-2007 03:49 PM  10 years agoPost 6
naked painter

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Mid glamorgan uk

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Thanks for the feedback everyone.

I think with a driven tail the chances of a decent landing are slim.

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09-11-2007 04:28 PM  10 years agoPost 7
MichaelP

rrKey Veteran

Northumberland UK

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Prey

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09-11-2007 04:37 PM  10 years agoPost 8
FenderBean

rrElite Veteran

Clarksville, TN

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I personally would gun it get as much alt as possible and hit throttle hold and auto, if I was lower 15ft or below just hit throttle hold and do a hovering auto

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09-12-2007 01:02 AM  10 years agoPost 9
legoman67

rrElite Veteran

Nanoose Bay B.C,​Canada

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i had this happen 2 me twice, both withen my first 5 flights, the first time the ball link snaped and the second the screw came out that holds the tail blade grips on the shaft, alowing them to silde to the shaft giving the blades pitch, both times i want only a foot off the ground and set it down quickly but gently(no training gear) i have been recently practicing prio hovering.. so that wil ehlp

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09-12-2007 05:13 PM  10 years agoPost 10
Pistol Pete

rrProfessor

Seffner, FL

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the screw came out that holds the tail blade grips on the shaft,....
loctite.
I personally would gun it get as much alt as possible and hit throttle hold and auto, if I was lower 15ft or below just hit throttle hold and do a hovering auto
excellent point!!!

~~Enjoying the hobby one flight at a time~~

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09-13-2007 02:42 AM  10 years agoPost 11
mikeflyz

rrApprentice

Westlake Village, CA

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I think with a driven tail the chances of a decent landing are slim.
The only tail rotor failure that I think is pretty much unrecoverable for driven tails is a failed tail rotor servo, stuck in one position, but that's pretty rare.

High on the number of failures I have witnessed is the loss of the tail rotor pushrod. It won't matter whether you're flying a driven or non-driven tail, in either case, the blades will feather to zero pitch, and operate like a failed tail rotor drive.

I witnessed Todd Bennett bring in a Fury with a failed TR pushrod from way far away (and downwind!) by flipping the throttle hold, getting the heli level, turning off the throttle hold and climbing while pirouetting straight up, flip on the throttle hold and flying back to the field and repeating the process in a "sawtooth" fashion until it was close enough to land right on that 3x3 square patch of carpet he's always using. All I could say was "wow!"

As previously mentioned, keep doin' them autos! Do 'em lots of different ways.

Mike
MA Fury Extreme, JetCopter SX

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