Gyro comatiability with servo question.

[jamseyboy5]

Hi guys, i have just purchased a DS95i tail servo, as my servo packed in last week, is this servo compatiable with the sl420 gyro which is what is on my 450 now?? Thanks

James

[nightstalker]

That servo Working Frequence: 760μs / 560hz so will not work with that gyro only the ones below

Suitable Gyros

Spartan DS760、Spartan Quark、Futaba GY611、GY601、GY520、ALIGN GP700、GP750、Mikado V-Bar Tail、Microbeast, Align 3GX, CSM SL720、Curtis Youngblood Mini-G 、Solid G、Thunder Tiger TG-7000

[cjcj1949]

The 420 has a super servo setting. The servo frequency is only a maximum and the 420 supports over 200Hz. It is true that to get the best out of that servo you will need to use the max frequency. I'm not sure you will notice the difference.

[jamseyboy5]

The 420 has a super servo setting. The servo frequency is only a maximum and the 420 supports over 200Hz. It is true that to get the best out of that servo you will need to use the max frequency. I'm not sure you will notice the difference.

So you are saying it will work with it? im confused

[trillian]

If the 95i is 760μs pulse width it will not work with the SL420 as the 420 will only work with 1520μs servos.

I had a DS95 (not the 95i) on my Trex 450SE tail with a GY401 gyro and it was simply amazing, so fast, the amount of tail control was really incredible with that servo.

[cjcj1949]

I thought the Super Servo setting meant a shorter pulse width, but in other information they do say it only gives a 1.520ms pulse, but at 250Hz. Does the MKS servo not work with the standard pulse width? I don't think it would do any harm to try. The main problem is the crude design of analogue servos causes them to overheat with higher frequency update. Servo and gyro specs are not very clear though. My Assan Gyro instructions say that most digitals will work in analogue mode. Certainly my DS520 does

[nightstalker]

I put a list of gyros that servo will work with as it's a 760ps (like the bls251 servo) your gyro won't work and if did will most probably burn it out

[trillian]

I thought the Super Servo setting meant a shorter pulse width, but in other information they do say it only gives a 1.520ms pulse, but at 250Hz. Does the MKS servo not work with the standard pulse width? I don't think it would do any harm to try. The main problem is the crude design of analogue servos causes them to overheat with higher frequency update. Servo and gyro specs are not very clear though. My Assan Gyro instructions say that most digitals will work in analogue mode. Certainly my DS520 does

What will happen if you plug a 760 pulse width servo into a gyro or RX that is outputting at 1520 is that it just wont work at all, you'll think the servo is dead, it will not move or make a sound it just won't do anything.

[cjcj1949]

There's no reason why it shouldn't work. But if they don't they don't. There is enough intelligence available, but perhaps it's not used.

[trillian]

There's no reason why it shouldn't work. But if they don't they don't. There is enough intelligence available, but perhaps it's not used.

In my experience with the 760μs servos if you connect them to a device running at 1520 they simply won't function. This has been the case with the Futaba BLS251 and MKS980, if they don't 'see' the right pulse duration they just won't respond at all.

[cjcj1949]

I used logic, definitely a mistake. Worth getting a gyro capable of driving a good servo fully. I've found a post that explains what the pulse width and frequency mean.

Basic (and less basic) stuff about servos, radios, pulse width and frame rates - HeliFreak

From my measurements on Multiplex and Spectrum the height of the pulse is just over 3V. I did have problems driving my Align 520 servo from an Assan 250 and concluded it was the servos fault. A second Assan 250 gyro does work ok though, even though Align say it needs 5V and Assan say it needs a servo amp or level shifter to give a 5V output.

[cjcj1949]

The cheapest option is the Assan GA250 which supports your gyro fully. It is a new mems gyro. Gyros have fallen in price recently.

[KevDavies]

Just get a Quark gyro to go with it, Best gyro out there and you can get em for £30!

[trillian]

Just get a Quark gyro to go with it, Best gyro out there and you can get em for £30!

Yeah, a Quark and the DS95i I would imagine would be unbeatable.

When I was flying my Trex 450SE I was always tweaking it to get it to fly better and trying different things. I had it flying pretty good with just a GY401 gyro and an Acerlab tail servo, I really thought I had a solid tail as it worked very well. Then the Phoenixtech guy was promoting MKS servos and I bought a DS95 from him and fitted it on in place of the Acerlab servo and it was so fast you could actually induce too much hold, it was astonishing how much difference it made. I was able to raise the gain to 100 without wagging! But it was too harsh with that much gain so I think I ran it around 80 in the TX. It made me realise just how much control the humble little GY401 could exert with an optimum tail setup.

Anyway, the other option would be to swap the 95i for a 95 if you want to keep the SL420 but it might be easier to change the gyro.

[kieranar]

Gyro comatiability with servo question.

+1 on a quark , won't fit any other gyro there the dogs gonads !