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03-20-2016 10:10 PM  4 years ago
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mynzbtr

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Illinois

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futaba s9250
Does anyone know if I can use this servo (Futaba s9250)as a tail servo. If so What are the pulse and hz rates. I cant find any info on this servo at all. I know the voltage has to be kept at 4.6 I'm able to find info on the s9251, s9252 but not the s9250. I know it discontinued but there has to be info out there.
Thanks.
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03-20-2016 10:35 PM  4 years ago
newbheliusr

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You guesss

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It's 1520, but not sure if it's 250 or 333.......I'd probably stick with which ever is lower on your fbl
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03-27-2016 05:51 AM  4 years ago
Dr.Ben

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Richmond, VA, USA

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Set it up for the same as a 9252. Do not ever run more than about 5.4v regulated or I pretty much guarantee the servo will fail in short order.. The 9250 was Futaba's first digital servo released to the hobby market. It has long since been discontinued.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-27-2016 05:35 PM  4 years ago
Four Stroker

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Atlanta

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The 9250 is the first Futaba digital servo. I have some on swash. Not fast enough for a tail servo even if using 1520 us center.
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03-28-2016 04:44 AM  4 years ago
Dr.Ben

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Richmond, VA, USA

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Actually it was/is Richard. The 9250 is all Cliff Hiatt, Wayne, et al ran with its contemporary HH gyro of the day, the GY501. The GY501 was sold as a set with the 9205 analog tail servo whose speed was 0.11s. The 9250 had the same speed but obviously superior performance as a digital. The pisser with the 9250 on the GY501 is that the gyro drove it too hard, so longevity was comparatively short. It would give a twitch or few as a warning shot over the bow, at which point you needed to land or prepare for no tail control. The servo was demonized, but it was the gyro that was more the problem.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-28-2016 12:44 PM  4 years ago
Four Stroker

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Atlanta

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I had the 9250 in a Kalt 50. Worked great for years on swash. Nothing wrong with the servo. I tried one on the tail with a 401 gyro. All by itself, I estimated a 1 AMP average draw which agrees with your assessment of "driving it too hard". I took it off the tail and put in a 9253 which worked just as well and reduced the total current drain (average) from 1.2 A to about 600 mA. BUT today 1.2 A is nothing.

And yeah, the 9205 was a tail tuned 9203 and was about 0.10 sec for 60 degrees. The 9203 had a similar problem as a tail servo. I tried that at one time.

So I guess I am saying that tail servos are "tuned" or set up for tail. They are not just fast low torque servos. At least Futaba knows this !

SO should FBL servos be "tuned" to work with a FBL gyro ? Most probably.
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03-30-2016 12:18 AM  4 years ago
mynzbtr

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Illinois

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So I took your guys advice, and replaced the tail servo with a JR DS8900g. From what I read its not a bad tail servo. thanks for all the info guys.
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03-31-2016 01:41 AM  4 years ago
Dr.Ben

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Richmond, VA, USA

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Correct. The gears wear a little fast and it is not to be run above rated voltage, but it's otherwise fine.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-31-2016 01:45 AM  4 years ago
mynzbtr

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Illinois

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I have everything regulated at 4.9 volts , thanks again
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