Mi Digital High Torque MG Servo 6.0kg / 0.11sec / 26g

 Qijia 1 points

I set it up as 1520us on my beastx and works fine

 pr0fab 440 points

Jeż*eli tyle podaje specyfikacja to raczej tak.

 Ivan_B 38 points

Does HK sell the servo shell...any one?...any one? screw threads stripped, all I really need is the top part of the shell, does anyone have one or two they don't need?

 Ivan_B 38 points

Just found out from HK support, There are NO PARTS available for these servo's...basically when you strip a thread or gear, throw the $30 servo away.

 Ivan_B 38 points

After hours of research and dismantling, I found Futaba s9257 servos are compatible.

 Ivan_B 38 points

Yes, you can use futaba s9257 gears and shell.

 =Gor= 28 points

****

 Egg Man 26 points

Don't run these at over 280hz, the digital amplifier can handle the frequency (as per the specs on blue Arrow's website) but the servo's heat dissipation isn't enough to get rid of the excess heat and it will cook itself to death, especially if used on a gyro. Stay at 250hz and it's a good servo.

 Egg Man 26 points

Actually I take that back, they seem to run fine at 333hz with no overheating. It may depend on your gyro. I would try running it at 333hz and if it starts getting too hot drop down to 250hz YMMV

 beenfly'n 463 points

I can answer this now. Output splines are the same as futaba, so the same as DS510 and MG930. Align 500 servo arms can be used.

 davidgeorge212 20 points

for the amount of torque it has I would say its pretty cheap if it works good.

 Sawdust 1605 points

It's not an ordinary servo either. The HK Mi Series servos represent the next break through in high precision servo technology. Using Magnetic Induction, rather than a potentiometer, for an unsurpassed level of accuracy and performance.

 Darivi 101 points

not is an ordinary servo, is magtetic

 phillip 12 points

Manufacturer specs found elsewhere on net are:
> "zero dead zone" less than 0.001ms dead zone
> "zero error" travel accuracy
> "zero error" centering accuracy
> all-digital circuit processing
> 360 degree output gear (2BB Rotation 1BB)
> Coreless motor
> Copper/Titanium/Aluminum alloy gear tooth(most aluminum's have ti in them naturally)
> O-type rubber ring, for shock, dust, and oil.
> J-Plugs.

 Bojan 10 points

Inside there is AS5043 8-bit analog output encoder.

 Mgp1970 10 points

And its the slowest site to load on the planet!!! (Especially if you try to look at the 280 servo)

 pauljurczak 8 points

They are using a magnet on output shaft and sophisticated hall effect rotation sensor. You can see similar devices at austriamicrosystems with 12-bit resolution per turn. This kind product is way overdue, but I'm happy they finally made it.

 crawlspace 69 points

4.8V and 6V represent voltage of a four and five cell receiver packs, all servos are rated for these voltages. It is also typical output range of a BEC which would be used in lieu of a receiver pack whether a separate component or built into the ESC for electric models. You can't run a receiver on 7.2V

 Sawdust 1605 points

Some servos are starting to come out rated for 7.2 volts and I'm not sure but I think some receivers too. It sure would be handy if everything new coming onto the market was. No more worrying if the bec can handle the job, reduced weight and one less thing to go wrong.

 JeffBr 252 points

Dear all, the 4 and 5 (old NiCD or Nimh) cell standard is from way back, representing 4,8 and 6 volts. Indeed most receivers and servo's are still max powered by these voltages. Pls. note that a fresh charged 4 cell NiCD or NiMH pack contains approx. 5 volts and a 5 cell pack approx. 7 volts. So when you switch your fresh charged 5 cell pack on, this means that your servo's and receiver can handle approx. 7 volts. This drops later on when power is consumed. When not used, the voltage and capacity from NiCD and NiMH cells tends to drop by itself. This could even be to approx. 30% afer a day. Luckely servo's that are powered by 2S (7,4v) or 3S (11,8v) Lipo's or 3S LiFE (6,6v) are offered more and more. To my knowledge most $pektrum (DSM2) receivers can be powered by 2S lipo's at the moment. Needless to say that this makes life a lot easier and cheeper to use ie. a 2S lipo as Rx power pack. Lipo's are more than 30% lighter in weight. Pls. note that a fully charged 2S lipo contains 8,4 volts and a 3S lipo 12,6 volts. But the good thing is that Lipo's and LiFe's hold their voltage and capacity, so even after a year they would still be 8,4 or 12,6 volts. LiFE's are a little heavier than Lipo's, but can be charged at very high rates, can be fully drained and charged at maybe 1000 times, and still be happy. Lipo's cannot be fully drained, you must keep approx 20% or they might get damaged. Just my two cents. Cheers, JeffBr.

 RW-Jets.de 58 points

Jepp I fully agree with JeffBr (was thinking this is a old story) Thats the reason why Im asking...I use Life in all of my models this year with no issue (when little bit more weight doesnt hurt). You dont need any BEC or something else (ok some plugs *) ) between the receiver and the Life - Lipo. But not all Servos handle the more Voltage...

 Sawdust 1605 points

Thanks for the good up to date information JeffBr. I like the idea of just running the whole system straight off a 2s lipo but even better the 2s Life a123s. Much safer than the lipos and as you mentioned they can be charged very fast so you don't necesarily need a huge pack to last a whole days flying since it's practical to recharge between flights with them. I've recently made a flight pack with a balance charge cable out of 2 of the smaller cells sold here. I haven't used it yet but it worked out something like 30 grams lighter than my 5 cell Eneloop nimh pack, less amp hours of course but I only need enough for one flight at a time with a safety margin left over.

 Swashplate 17 points

JeffBr made one small err: a 2s (not a 3s as JeffBr said) Life/A123 battery has a nominal voltage of 6.6v! I run my nitro 50 helicopter with a 2 cell a123 rx pack and love the simplicity of not using a regulator!

 Jed 7 points

I've been running 2S lipo unregulated in almost all my stuff w/o any receiver or servo issues for about 3 years now. I wouldn't do it with Futaba servos, but my Hitec servos have held up just fine for quite a while. My receivers are XPS and Hitec. No issues. Lipos are much lighter than A123's as well.

 Busard 11 points

Me Too *-)

 scatcat1 663 points

It's only a mini servo, not full size!

 muchomor84 174 points

Probably this servo will be comapable with Align DS510 or PowerHD3688HB (but with MG) and Savox 1250MG. Well, the metal gears are must have in every heli. For me even in F3A competition airframe. These could be good as the elevator servos each one in horizontal stabilizer halves. Wondering if tey have coreless motor or not. Please HK give us more info about this servo.

 H-KING_SCOTT 5160 points

These are Magnetic Induction servos. Don't compare them to old-school models such as Savox and Align's OEM'd servos.

 chewy 153 points

Do you really need titanium alloy for 5.0kg torque?

 kyalamikid 31 points

Ever heard of crashing heli's and stripping gears? *-) Ever heard of gear slop from wear? Sheeeesh? Look awesome to me!

 muchomor84 174 points

God! Have you ever seen hobby servo with gears made of titanium itself??? Mostly there are two steel gears and other gears are aluminium with titanium coating, making them lightweight and yet strong with low moment of inertia. This servo is smaller than standard size. So gear have smaller module, it means that they breakable in easier way. I would not use this size in plastic i 57-60" wingspan class 3D airframe cause about 10 years ago i broke gears in HS-225BB on ailerons during flight without any crash.

 UL 32 33 points

Just use Frsky made Futaba receivers and 2S servos. Then you don't need Becs.

 Arjuscha 38 points

Digital?

 Grzegorz 198 points

they are more digital then the other digital servos, because there is no analog potentiometer in it

 K-man 41 points

4.8V/6V SUCKS!!! Who uses NiMH these days, anyway? If HK is to offer a new servo, shouldn't it be either a 3.7 or 7.4V for one- or two-cell LiPo operation???

 Birdy 23 points

Some Rx like the Xtremelink can handle 30V so it will be an advantage if servos are made to handle higher voltage.

 ethan 5 points

$30 is too high for 5kg of torque, what a waste. Get 15 - 20 kg of torque and then it would be worth it. Good idea, needs more...

 K-man 41 points

Yes, Birdy, exactly my point! HK should roll out 7.4V-compatible servos, then 7.4V-compatible recievers, and so on. If I had to pick between 3.7/4.8/6/7.4V, I'd choose 7.4V anytime**more power transferred with thinner wires.

 Birdy 23 points

I still like the idea of Magnetic Induction, like it is said - one less wear point on the servo. Old pots were and still is why most servos fail other than abuse.

 Birdy 23 points

Why complain about 5kg on new technology for RC. It is the start of something good. Even if there might be some shortcomings, I am willing to support new ideas.

 Lojik 25 points

The idea is a good one and with more units being made they will improve and eventually match the current market in stats vs cost. being a new tech though you would expect to pay more at the start. Great little servos, we need some decent full size ones now for us F3C Heli nuts :)

 Geoff 5 points

How do you extent the degree of rotation? are they programmable? Where is the programmer? If I adjuste the endpoints on my radio the max I can get is about 90deg. These servos say they can rotate 360deg and thats what I want.

 Richard 5 points

Not a new idea. F&M Electronics had a magnetic encoder about 40 years ago. Kraft had a servo that used a variable capacitor in place of the potentiometer. Both of these servos proved to be more trouble than the servo with the potentiometer.

 lolipop202 195 points

* Richard==> brushless are also not a brand new technology but sold as if it was a brand new tech. since maybe 5 years ... BTW* High Torque ? 4.20kg.cm (4.8v) - 5.0kg.cm (6v) this is absolutely not a hi torke with the actual things aviable on the market :=)

 K-man 41 points

> this is absolutely not a hi torke... ... if you compare it BIGGER servos. Considering its own weight of 26grams, I'd say it is damn good "Mini High Torque" unit!

 Jeff 5 points

Let me know when they release a 10 - 15kg version at a decent price...

 K-man 41 points

> Let me know when they release a 10 - 15kg version at a decent price... ...I doubt there will be such strong 26gram mini-sized servo anytime soon. They might release bigger 70gram version in this torq range, definitely NOT "mini" sized :)

 Jeff 5 points

Standard size would be fine...

 Egg Man 26 points

This is actually a Blue Arrow DMS28013MG. Control System: PWM Pulse Width Control Processor: Digital IC Required Pulse: 3 to 5 V Peak to Peak Square Wave Working frequence: 1520 μ*s /333 Hz Rotation angle sensor: MAGNETIC INDUCTION Rotation: Left Rotation: 46, Right Rotation: 46 Voltage: 4.5V to 6.0V Temperature Range: -20℃* to 60℃* Driver Type: MOSFET Operating Angle: 45 Deg. one side pulse traveling 400μ*s Direction: Clockwise/Pulse Traveling 900μ*s-2100μ*s Pulse Width Scope: 900-2100μ*s Neutral pulse: 1500μ*s Resolation: Minimum resolution:0.088°*/0.9μ*s Maximum resolution:0.350°*/4μ*s Rotational speed of magnet: Maximum 600RPM (r / min) Magnetic offset: ±*10mT Magnetic input field amplitude: 45 to 75mT Speed:(No-load ): 0.14sec/ 60°* * 4.8V 0.11sec/ 60°* * 6.0V Torque:(Stall Full load): 4.50 kg . cm * 4.8V 5.00 kg . cm * 6.0V Idle Current: <0.05 A/ 4.8V <0.05 A/ 6.0V Running Current: <0.10 A/ 4.8V <0.20 A/ 6.0V Stall Current: <0.10 A/ 4.8V 1.2 A/ 6.0V Motor Type: Coreless Motor Bearings: 3 Ball Bearing Bearing Type: MR74 (4mmX7mmX2mm) MR106 (6mmX10mmX2.5mm) MR06ZZ (6mmX10mmX3mm) Gear Material: Titanium Gear Servo case: （*Aluminum Radiator）*Metal Center Plug: "J" type Connector Wire Length: 260.00 mm Connector Wire SPEC: OD1.2mm/30 x 0.08mm 3p x 260mm "J" type Weight: 26.00 g Dimensions (L x W x H): 35.50*15.00*30.00 mm

 Egg Man 26 points

JR uses this technology (hall effect sensors) in their high end servos and charges a premium for it, which is bull because these hall effect sensor chips were developed to provide a lower cost alternative to high quality pots in consumer electronics not because they're more accurate.(they aren't, just better price vs performance and they last longer)