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Home✈️Aircraft🚁HelicopterHIROBOOther › Dead servos on tail
09-04-2006 10:09 AM  14 years ago
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Joker

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Debrecen, Hungary

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Dead servos on tail
Hi,

I heard many stories about dead Futaba tail servos.
It happened to me also once.
Is it possible to predict how long does a servo last on tail?
Is there any way to see that a servo is about to die?
What kind of servo (6V) would you recommend for Futaba 401 gyro other than Futaba?

Joker
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09-04-2006 10:34 AM  14 years ago
cybergirl

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Ireland

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Happened to me on the weekend.lucky it went when i was only a few feet up in a stable hover.No damage.Not going to use them on the tail amymore as this is the second time.


regards

Shana
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09-04-2006 01:39 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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I think more 9254 servos get fried beacuse of the following 3 reasons, not because there's a problem with the servo.

3. Vibration being directly transmitted from a tail mounted installation and a carbon rod.

2. Oil intrusion on a tail mounted servo.

And the #1 reason........

People subscribing to the out of date practice of cranking up the gain on a 401 till the tail wags then backing off a hair instead of running just enough gain to do the job.
Andy
AMA 77227
http://www.jaxrc.com
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09-09-2006 10:40 PM  14 years ago
samstar

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UK

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Is there any way to see that a servo is about to die?
I'd like to know this too...Can a warn out tail servo be noticed before it's too late??
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09-10-2006 01:00 AM  14 years ago
hellflyer

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Staten Island NY

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I do belive you shuld run a futaba digital servo at 4.8v not 6v
I could be wrong
The first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
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09-10-2006 04:59 PM  14 years ago
jkelly

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Bedford, PA

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BarracudaHockey,
I do agree that your reasons are valid but in my experience I don't recall the 9253 having such a common failure rate. The 401/9253 was a good match and even with the gain high. I wonder what the difference in the two are. I thought the instructions are to adjust the gain to the point it wags and then back off vs. trying to creep up on what you need. On the other hand, the 601 will break your heli if you aren't careful with it's gain.

I killed a 9254 just hovering and SFF.
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09-10-2006 06:06 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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I think the 54's are more sensitive to running too hot w/ too much gain.

Here's what Dr Ben has to say about setting up a 401

http://www.futaba-rc.com/team/team-tip-002.html
Andy
AMA 77227
http://www.jaxrc.com
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09-11-2006 06:08 PM  14 years ago
hellflyer

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Staten Island NY

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S9252 All-Purpose
FUTM0222
Volts Torque Speed
4.8V 91.6 oz-in. 0.14 sec/60°
6.0V n/a n/a

Dimensions Weight
1.6 x 0.8 x 1.5 in. 1.8 oz.

S9254 Heli High Torque/High Speed
FUTM0224
Volts Torque Speed
4.8V 47.2 oz-in. 0.06 sec/60°
6.0V n/a n/a

Dimensions Weight
1.6 x 0.8 x 1.4 in. 1.7 oz.


It does not give a speed or a torque spec and I am still looking for the artical from futaba where they said that they do not recomend 6v on their digital servo
The first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
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09-11-2006 06:12 PM  14 years ago
hellflyer

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Staten Island NY

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I found it on the frequently asked questions under battery

Can I use 6v (5 cell) receiver packs with my Futaba receiver/servos? Will I get increased performance from my equipment? Are there any drawbacks to using 6 volts?
All Futaba systems are designed to operate on either 4.8 volts (NiCD 4 cells) or 6 volts (Alkaline 4 cells OR NiCD 5 cells), except certain servos which are specifically labeled for use at one voltage or the other only. Some manufacturer's systems are not designed for and do not operate well on 6 volt, but most Futaba equipment handles the increased power input and provides increased performance, speed and torque.

Please note that while 6 volts provides you more torque and speed from your servos, it also provides you a significantly shorter run time for the same milliamp hours of capacity and may shorten the life of your servos proportionally. This sounds confusing, so it may help to compare the current in the battery to water in a bucket. If you have four small holes in the bucket, the water will come out at a certain rate. Add a fifth hole the same size, and you're supplying more water (increasing the current and therefore making the servos stronger AND faster); however, the bucket empties 25% sooner than when it only had four holes.


--------------------------------------------------------------------------------
The first step in gettin help is admitting you have a problem ( yes I am addicted to helicopters )
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09-11-2006 08:44 PM  14 years ago
RICH.L

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gentry arkansas

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i found a bad servo on my century raven 50 just before it let go.
seems the tail wasn't holding very good and would start to blow out in certain manuevers.
pulled it off and you couldn't even move the s9253 by hand,i would say that time i lucked out!
and i caught it on my preflight checkover!
rich
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09-11-2006 09:30 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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While most of that is true the bucket analogy is over stated, that assumes a constant, predicatable load.

The actual increase in consumption is closer to 6 or 7 percent.

Servos rated for 4.8 volts will in most cases run reliably on REGULATED 6 volts, as 4.8 v packs fresh off the charger run nearly that high anyways. Its the 5 cell packs that peak at 7 volts + that cause problems with digitals, the dead band narrows as the voltage goes up and the servo chatters itself to pieces. (well wear will be greatly accelerated)

It cracks me up that people say well "_______" (fill in your favorite top flyer) uses such and such at 6volts, my reply is they also get free or greatly discounted servos and would replace one at the first sign of wear, whether at 10 flights or 100.

For most of us that have to pay the freight, IMO 6 volts just isn't needed or worth the extra wear and tear.
Andy
AMA 77227
http://www.jaxrc.com
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