HKS-9257 is a high speed, high torque digital servo, Suitable for HK500/Align Trex-500 size Helis.
Spec. Dead band: 0.002ms (Default) Control System: +Pulse Width Control Working frequence: 1520μs / 80hz Digital mode/Analogy mode (RX) Required Pulse: 3.0~5.0 Volt Peak to Peak Square Wave Operating Voltage: 4.8~6.0 Volts DC Operating Temperature Range: -10 to + 60 Degree C Operating Speed (4.8V): 0.08 sec/60° degrees at no load Operating Speed (6.0V): 0.07 sec/60° degrees at no load Stall Torque (4.8V): 3.8 kg.cm Stall Torque (6.0V): 4.2 kg.cm 360° Modifiable: NO Motor Type: Coreless Motor Potentiometer Drive: Indirect Drive Driver Type: FET Bearing Type: Dual Ball Bearings Gear Type: Plastic gear Programmable: YES Connector Wire Length: 18.0 Dimensions: 36x15.3x21.8 mm Weight: 25 g
Equipped with two ball bearings. For use with the Futaba GY401 (FUTM0807, FUTM0808) and the GY502 gyros.
Does not work with these Futaba radios (4FG, 5FG/K, 6FG, 6FG/K, 7FG/K New Terratop, 3EGX, 3PGE, 2NL, 2LGX, 2FR, 2PK series) These radios have a servo neutral signal of 1310us not compatible with this servo. Do not use with AM radios.
WTWUK, i am not able to reply to ur answers, so i write replies as new questions. regarding my previous previous question, what u mean by quality of a servo? for example when i buy some clothes say from a popular brand it is expensiev, but i can buy almost the same clothes from other brands that are not very popular and they also have almost the same quality as a popular clothes brands!
i want to participate at air cargo challenge, so i need to build a very lightweight airplane and at the same time to be very robust.
WTWUK or somebody else, if u would like to help me, u can send me an email to the following adress: iurcicDELETE_THE_LARGE_LETTERS*gmail****
i have seen the following property:
Operating Speed (6.0V): 0.07 sec/60°* degrees at no load
can this servo operate slower when it has a load?
i have seen servos that have almost the same characteristics as this onebut are more expensive, so i would like to know why they are more expensive.
When loaded the servo will be slower, depending on how much load it is moving. This applies to all servos.
You see more expensive servos with similar specifications as they may be of higher quality.
Please do not credit for these answers - help is free.
Forget all about the 40A in this instance - that is the amount of current the Speed Controller can supply in Amperes to a motor. It is nothing to do with powering your servos. A servo will draw current from the ESC BEC 5 (or 6volt) 5 Ampere supply as it needs it. Typically servos draw in MilliAmperes.
All servos have 'dead band'. It is how much time a servo takes to respond to an input. The smaller the deadband, the faster response. Analog servos will have an 8us deadband and digital servos like this one will have 2us or less which makes them ideally suited to helicopter gyro control.
Pavlov - some high end digital servo's can be 'programmed'. They have a dedicated program box that can change the way they behave. Changing travel speeds, distance and many other items. This particular servo is not one of those types, but theoretically, if one knew how, it could be 're-programmed'.
I see alot of these are burning out but sounds like its from using incompatable gyro's and running them on 6v. I would like to try them out on a eflight stick as they fit nicely and run them on 5v. I think they should last then. anyone tried these on a plane before?
Yes. i know. but a 1/10 Drift car can even work with 2.5kg servo. meantime i'm using a very cheap sanwa servo with plastic gears & 3.5kg but speed is slow, thats why i'm considering this servo because of the speed.
drift cars don't have much force.
I hope this servo works on 1/10 Drift car.
yeah of course you can still use it anyways, my TT-01 is running with the cheapest plastic gear servo that was included with my age old 27Mhz transmitter, still working today, though if I would buy a new one now I'd get a metal gear, or at least a spare set of gears.
Hey buzz,Just wondering what your settings are on your 780 gyro?I have these comming and plan on using the same gyro for my 500 any info would help alot
6 thumbs up!
Bought this servo for my trex 450 pro which I fly a lot. It work fine BUT...
After about 10 hours of flying the servo died during flight. I was lucky to be half meter from ground and avoided crash.
I do not recommend this servo. It dies after short time.
Does anyone knows if the futaba 9257 live longer?
10 comments. Reply..
5 thumbs up!
Bought this digital servo labeled GS-D9257 GOTECK. Specs allow 6v so tested under 6v with HK-401b. Tested on a HK-500CMT electronically & mechanically set up perfectly. Heli itself, flies with no abnormal vibration. In the Initial test, the tail does not well, got some side to side slide. Servo died electronically after 4 minute test flight.(Gears good, receiving power, reacts when physically moved but dead to any command from receiver and/or gyro. (2 other reviews stated the same problem) This is the second servo (same type) that has died after a few minutes of test flight using a second HK-401b. (Please know that some HK-401b gyros need components to be secured inside case with glue which has been addressed for this test)
A lot of reviews state this combo works well, perhaps their system is running on 5v.
Will examine the anomalies between the good reviews and bad reviews to determine why with some folks this combo works well others the same exact combo does not.....or perhaps some reviews are not true.
Will put on the bench for analysis. Possible suspected problems for now: -Servo designed for 5v and burns on 6v although specs allow 6v -Gyro frequency on DS "Digital Servo" to high for this servo.
Will post again after bench testing and substitution method to trouble shoot the problem. Any other tests/comments are welcome, please reply.
9 comments. Reply..
4 thumbs up!
Fast, precise and smooth at first glance.
Used as tail servo on HK401b gyro at 6.0 volt on HK450pro Belt.
The first couple of flights it was fine, but then I got a slight tail wag.
Turned down the gain and it was fine again.
Then, after only 10 flights or so, it broke mid flight.
Tail going randomly from left to right.
Tried to auto it , but failed.
After inspection I saw the gears are still good , but the servo did not move at all.
As I did buy two, I will give it another try to see if the first one was just a dud or if they systematically fail under these circumstances.
Will report back after testing it.
6 comments. Reply..
4 thumbs up!
put one of this servo on my gt500 tail, after 3 flight it dead in the air, but my gt500 only die when it hit the ground. so i think i will get a futaba next time.
No comments. Reply..
3 thumbs up!
I have 2 of them.Hk 401 gyro on blade 400.After 20 sport flying the servo died.I was going for landing so i save it.
For hover is perfect but more ..... .Finally you got what you pa