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MKS 9910 servos in jets
Hi everyone,
I'm just about to take delivery of my comp arf ultra flash evo and I'm thinking about servo choices. I'm thinking of using the MKS 9910 servos but haven't used them before. Does anyone have any experience using these and if so, would you recommend them? Thanks in advance! Steve |
In my manual for the Ultra Flash (Not EVO) they wrote that I had to have JR, If I recall correctly, 8411s for the Horizontal Stab, due to the thin stabs. After playing heck trying to find some, I tried Hitech 5585MHs and they still fit. Point being, maybe you should check with the manual, then get the servo dimensions for what they suggest and then start looking for options? I wish I had done that because I would have just used the 5585MHs in the first place.
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Dee Force Aviation sells JR 8411's and they have HV versions of them as well.
Just FYI. Bob Neal |
Hi Bob, thanks for the reply, I had an ultra flash years ago running 8411s the stabs on the UF EVO are now thicker to accommodate other servos I believe. But in the UK I think it's nearly impossible to source 8411s now, guess I could have them shipped into the UK,
Thanks for your time, Steve |
Jr servos
JR servos are available from rcdiesel in Slovenia. Great prices, great service, free shipping. 4 x 8931 servos for 399 euros. rcdiesel.eu |
Thanks David,
I'll take a look, Cheers Steve |
Originally Posted by David Gladwin
(Post 12547928)
JR servos are available from rcdiesel in Slovenia. Great prices, great service, free shipping. 4 x 8931 servos for 399 euros. rcdiesel.eu Do you happen to know if the 8931s run on a futaba and power box mercury set up or does it have to be run on a JR bus setup? setup? Thanks in advance Steve |
I was very impressed indeed with the 8931 and converted my Hawks and Sabre to use them on primary flight controls. They will also be used on my new SeaFury. Particularly like the softstart aspect. They automatically recognise the incoming signal so can be used as conventional ppm servos or on x bus. Doubt if they will work on s bus but see no problem with a Futaba rx and Mercury. Of course, other good choices for high performance are the Ditex programmable servos, 2612s, and the Futaba HPS A700, hugely powerful and precise servos with very low current drain. I use both types. Your choice ! D. |
Thanks David,
Appreciate your time Steve |
Steve You can use 8935’s too, plenty of power Dave |
Anyone had issues with MKS 777+ servos jerking a bit with with fast stick movements? changed to Ditex and the issue went away. Chatty. |
Originally Posted by c_makhija
(Post 12548215)
Anyone had issues with MKS 777+ servos jerking a bit with with fast stick movements? changed to Ditex and the issue went away. Chatty. The issue is that the servo requires higher drive current for the signal line. I am guessing that instead of using a MOSFET on the PWM signal input, they are using a transistor. The industry standard is to use 1K ohm series resistors for each signal line from the receiver. At 3.3v this means that the servo's signal line has up to 3.3mA of drive current. Whatever the servo is using for triggering the PWM pulse internally is marginal at that max drive current, and outside interference (like a HV ignition system) can cause the PWM signal to be corrupted. |
Originally Posted by Edgar Perez
(Post 12548292)
I copied and pasted from another forum. Here is the XPS24 designer explaining the issue with the 777 :
The issue is that the servo requires higher drive current for the signal line. I am guessing that instead of using a MOSFET on the PWM signal input, they are using a transistor. The industry standard is to use 1K ohm series resistors for each signal line from the receiver. At 3.3v this means that the servo's signal line has up to 3.3mA of drive current. Whatever the servo is using for triggering the PWM pulse internally is marginal at that max drive current, and outside interference (like a HV ignition system) can cause the PWM signal to be corrupted. |
Seems to b specific to the 777. He indicated that MKS is working on a fix. Lastly from what I read the issue don't necessarily show up in every installation. Maybe MKS can share their official position...?
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I had the problem on long leads for the elevs and rudder. Changed 20 20g wire all the way and problem went away. 777A+
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I’m running the MKS HV9930’s in my large Havoc ... these have control loop tuning specifically for jets. Some other good features as well. Noticeably smoother than the 777A+ that I’ve been using recently. Really like them so far. JS |
Originally Posted by Steve Moore
(Post 12547993)
Thanks David,
I'll take a look, Cheers Steve Today would be good since you have nothing to do today Ahahaha! John |
Originally Posted by JohnMac
(Post 12549233)
Steve, If you want to know about MKS servos give me a call. I have been running them for years.
Today would be good since you have nothing to do today Ahahaha! John Yeah I will give you a call, be good to catch up, Speak soon Steve |
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