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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › ****A warning to Futaba 9254 users****
09-05-2006 10:42 PM  14 years ago
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gkoutsis

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Athens Greece

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****A warning to Futaba 9254 users****
One month ago, I was inspection my 50 bird before going to the field.

I noticed that the tail servo would act "funny". I played with the cable a bit and discovered that the cable was cut inside the insulation right at the rubber grommet.

The servo had only 5 flights before and was bought new with a 401 from a reputable shop in Hong Kong.

But, the same thing happened to my other 9254 on a 30 bird this weekend. Exactly the same thing right at the rubber grommet. That servo has done more than 50 flights though. That one was bought from a UK shop with a 401 as well.

So, my adive to you, with the TX/RX open, fiddle with the wire going to the servo. If you see it stops responding for a second or two, you have a broken wire somewhere.
George
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09-05-2006 10:44 PM  14 years ago
Mark C

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Houston, TX - USA

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Tail mounted servo?


Mark C.
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09-05-2006 10:44 PM  14 years ago
gkoutsis

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Both of them.George
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09-05-2006 10:48 PM  14 years ago
Mark C

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Houston, TX - USA

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I have broken wires of of 2 S9251 servos. Both were tail mounted. I don't know why. No one else has tail mounted servo issues. I moved mine back under the canopy and they seem very happy there. No problems since then.

Mark C.
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09-05-2006 11:04 PM  14 years ago
Luis104

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Caracas / Venezuela

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DID you experimented some kind of momentary kick to the right in the tail...??? I´m asking because I had about 2 or 3 kicks in my last flight (using a 401 and a 9253)
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09-05-2006 11:17 PM  14 years ago
lrogers

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Mobile, Al

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I'm having the same problem! All seems well, then WHAM a kick and then it's all good again.Larry Rogers - R/C Helicopter Pilot
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09-05-2006 11:22 PM  14 years ago
gkoutsis

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Indeed, everything started with the tail kicking a couple degrees and then centering again. In the beginning I though it was glitches but I am using PCM so it was out of the question. That was on my last flight before the discovery of the broken wires.

For the ones who has this issue, move the cable on the servo side and you might discover that yours is broken as well.
George
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09-06-2006 02:30 PM  14 years ago
firefox

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Thailand

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Hmm, "reputable shop" and "Hong Kong" could never reside in the same sentence for me. My experience with HK shops, especially the shops in the tourist areas, have been *extremely* bad. The shops there treat customers like trash. Scams are everywhere. Buyer beware.

Nearly a hundred flights with my 9254, and no problem. I taped the line to the back of the servo to relieve stress issues.
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09-06-2006 02:38 PM  14 years ago
gkoutsis

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Hmm, "reputable shop" and "Hong Kong" could never reside in the same
They can if their name is Cyberheli
George
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09-06-2006 02:50 PM  14 years ago
dtm360

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HKG

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Firefox...you seem to have had a bad experience. I do most of my shopping in Hong Kong and have not come across any scams. They can be blamed for not knowing what they are talking about sometimes...but if you know what you want.........
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09-06-2006 03:23 PM  14 years ago
rob10000

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Western Massachusettes

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Is this what your looked like?

this has been discussed before, but not recently..

http://www.runryder.com/t200562p1/

http://www.runryder.com/t147977p1/
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09-06-2006 06:35 PM  14 years ago
Luis104

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Caracas / Venezuela

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OHH....crap...!!! I might have that problem, I´ll check that tonight
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09-06-2006 06:40 PM  14 years ago
gkoutsis

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Athens Greece

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No, mine looked ok but one of the wires was cut inside the insulation so you could not see it.George
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09-06-2006 07:41 PM  14 years ago
rob10000

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Western Massachusettes

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I don't know why I bother posting links to posts; noone reads them anyway...
Is this what your looked like?
No, mine looked ok but one of the wires was cut inside the insulation so you could not see it.
Here's the text from the post I linked to. The original author was Dkshema, BTW....
When I went to grab the rear of the main frames so I could hold it while I tightened up the screws, I accidentally brushed the S9254 servo wire with my hand.

The entire three-wire lead simply pulled out of the servo grommet. THIS explains the odd tail movement. All three wires had fatigued and broken off, inside the grommet. Here is what it looked like prior to accidentally bumping the wire harness:
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09-06-2006 07:50 PM  14 years ago
JR_Vibefreak

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Bangkok Thailand & UAE Dubai

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looks to be stiff to me that caused this problem!GIXXER4LIFE Philipp
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09-06-2006 08:48 PM  14 years ago
CXD

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Norway

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Oh Sh!t
I`l better check mine right now!
Dumb Thumbing doesn't apply to pinchers!
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09-06-2006 09:05 PM  14 years ago
CXD

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Norway

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It was fine, but I`m gonna add this check to my pre-flight routine.
I don`t want that to happen in the air.
Dumb Thumbing doesn't apply to pinchers!
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09-07-2006 12:43 AM  14 years ago
Luis104

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Caracas / Venezuela

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OK...

this it`s my servo on the inside (S-9253) The cable has some kind of silicon protecting the cables. maybe the failure it`s only on the S-9254, or in older servos. But I still worder: Why I had kicks on the tail in my last flight...??? I guess I`ll have to make an inspection in all the cables and in the gyro (GY-401)
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09-07-2006 01:15 AM  14 years ago
jetranger

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PERHAM M.E.

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servo wire
I had the same thing happen on three tail mounted servos--I found why this is going on--If you have the servo wire with play in it before it gets to the side frame for hold down this will happen--while in a hover my friend could see the wire flexing up and down and it looked like a blur it was so fast--thats how the wires are breaking--after this I used the wire wrap to cover the wire and made sure the wire had no slop it to vibrate--have not had a problem in over 75 flights--Seems like the problem was the air blast from the main rotor hitting the wire
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09-07-2006 01:18 AM  14 years ago
Roamer

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Albuquerque, NM

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I usually mount my tail mounted servos with the wire going out the back (yes, towards the tail!). This allows me to loop the wire back over the bottom of the case and use a nice piece of electrical tape to firmly attach the lead to the case. The loop at the servo is not so tight that it is pulling on the PC board, but it IS tight enough to prevent it from moving around due to vibration.

No problems to date.
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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › ****A warning to Futaba 9254 users****
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