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HomeAircraftHelicopterGasser Model RC HelicoptersOther › 1005 tail wag
10-15-2010 09:29 PM  8 years agoPost 1
Bladebuster

rrApprentice

Bayside N.Y.

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I've developed a tail wag in my 1005, and was wondering if anyone could give me a list of things that i could look for, that causes this.
The one thing i noticed is, when the heli. is on the ground and idling, the tail servo arm is jittery. I changed the servo, but it still did the same thing. I also checked the gyro, to see if the tape wasn't holding. Also one other thing. The tail servo was getting very hot. I assume this is because the servo is working overtime with all the vibration in the tail. But, besides that, does the location of the rear mounted muffler, which just under the tail servo, add more heat to the servo. Thanks

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10-15-2010 09:42 PM  8 years agoPost 2
pgkevet

rrKey Veteran

Wales

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If your tail servo is jittery even with a change to a known good servo then gyro sensor is the next place to look (as I found out with my 611).

There's a pilot with this sign-off:
"Tail wagging: heli happy"
That makes me chuckle every time i read it.

pgk

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10-15-2010 09:48 PM  8 years agoPost 3
jones007

rrApprentice

Monterey, CA - USA

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If the tail servo is steady with the engine off, but twitchy when the engine idles, it would seem to be an indication of too much vibration and/or too rigid a mount for the gyro. What gyro are you using, and where/how is it mounted?

In flight, I expect the muffler position has no effect on servo temp, as you have plenty of cool air blowing over it. If it's hot, it's because it's working hard.

--Kevin

Trex 700N, Trex 600ESP, Trex 500, Trex 450Pro

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10-16-2010 01:05 PM  8 years agoPost 4
Bladebuster

rrApprentice

Bayside N.Y.

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Thanks for the replies
I have a 401 gyro, with a 9254 servo. The gyro is mounted up front on a single piece of futaba mounting tape.
I have a spare 401. I'll try that next.

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10-16-2010 01:17 PM  8 years agoPost 5
z11355

rrMaster

New England

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maybe just the mounting foam is deteriorating and losing it's squish.

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10-16-2010 01:24 PM  8 years agoPost 6
Bladebuster

rrApprentice

Bayside N.Y.

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This is a new piece of tape

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10-16-2010 02:05 PM  8 years agoPost 7
AceBird

rrElite Veteran

Utica, NY USA

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But, besides that, does the location of the rear mounted muffler, which just under the tail servo, add more heat to the servo.
Did you recently add the rear mounted muffler? I am thinking a tuning issue causing excessive vibration.
Twiching servo side note:
This can be because of receiver, wiring, connectors, RF issues, servo and gyro. Vibration can play havoc with all of these. Try to pinpoint what was different from your last good flight.

You replaced the servo already, I would jump out the gyro before I tried replacing it just for a short hover. If it is still twichy, put back the gyro and replace the receiver. I would assume you have already checked for a notchy bearing, cracked frame part, or a loose screw before you did anything. Right?

Ace
What could be more fun?

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10-16-2010 04:43 PM  8 years agoPost 8
Bladebuster

rrApprentice

Bayside N.Y.

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Acebird
The muffler came with the ship.
I tried richening and leaning the low and high needles.
I looked for loose screws and cracked frames. The bearings were checked about a year ago. Since then i haven't flown the ship that much.
The next thing i want to go over is the gyro, receiver, and i did notice some flexing of the plastic tray where the gyro is mounted. I put the gyro up front next to the collective servo. Hopefully i can get out next week. Thanks again.

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10-27-2010 02:25 PM  8 years agoPost 9
shuttlepilot

rrElite Veteran

Mullins, South Carolina

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Bladebuster
If the gyro is not found to be the issue, try checking the bearings in the tail blade grips. My gasser tail wanted to wag pretty bad one time and I found that the thrust bearings in the tail were binding up. After I got that sorted out, the wag went away. Just something else to consider.

Gas is Great
Camper Fuel is Better!!
QWW Helis

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10-27-2010 04:26 PM  8 years agoPost 10
rbort

rrProfessor

Franklin, MA - USA

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+1 on the tail thrust bearings
And another thing to check is the black dogbones just below the tailboom clamp. They can crack sometimes and cause shakes. I've replaced mine with the fatter hex canopy standoffs cut to size and those never fail any more.

One more place to check for your problem.

-=>Raja.

MA 1005 Hanson 280, 4225 flts
Spectra 27 3DMax, 3325 flts
Whiplash V1-2 Hanson 300, 1650 flts
Whiplash V2 Hanson 300, 504 flts

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10-28-2010 02:56 AM  8 years agoPost 11
Bladebuster

rrApprentice

Bayside N.Y.

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I'll take a look. Thanks

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