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.
I have these in my hk500 with the Robird G31 controller.
I need to specify the properties of this servo but I can not find the values:
The options in the RObird setup are:
What is the correct value?
I have the same servo and gyro. I use at 125Hz and until now (30 flights) was great.
I found this information (you can google it) "This servo must be set at 1520US and 333Hz , gyro incorrect settings may cause the servo burn".
Im using this servo as my rudder servo with hk 401b gyro and its rock solid. Im using tgy306s as my cyclic which is over kill but they are strong smooth and responsive. I really like my combo at the moment and have had many flights with no problems.
Wouldnt change a thing!! Hope this helped
Servo strepitoso! Molto preciso e molto potente!Alimentato con bec 5,2v , NON SCALDA e ha ottime,super prestazioni per figure come caos e piroflip sulla coda di un 450pro.
Adesso bisogna vedere quanto dura prima di morire!
Speriamo bene! *)
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?
12 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.
12 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