Anyone use MKS HV-787 servo's

[Jamin_00]

I recall seeing a few reports of people trying these servo's but not heard anymore since.

Any good or not?

[GravityKills]

tried, no, but they do look promising.
A German MKS distributor was present at 3D masters, and AFAIK, the Outrage TORQ servos are rebranded MKS.

[rapt50]

A buddie of mine at the wanstead club (angelo) swears by them he has them on his two N9 running them at 8 volts (doing all the out of control 3D malarky)

[GravityKills]

just wondering... the torque and speed make it look almost like a tail servo, instead of swash. I considered to give it a try, but changed my mind when looking at the low torque (8.44 kgcm) compared to the JR DS 8915 (12 kgcm at much lower voltage)

[PsiLo]

The Outrage servos ARE made by MKS but they are not the same as any of their own as they have a higher spec.

I have gone for the HV 767's on my 6HV @8v but that is still in build stage so no reports on them yet.

I have heard reports that some of the MKS sponsored pilots have gone back to the 767's after using the 787's and reporting they are TOO fast! Don't understand how they can be too fast but that is what I have heard!

[sacko]

HobbyKing Online R/C Hobby Store : MKS HV-787 Digital HV-2S Servo 8.44kg/ .033sec / 79g

Is that them?! Bargain.

£145 delivered for all three.

[Jamin_00]

Thats em mate, or these HobbyKing Online R/C Hobby Store : Turnigy HV-767 Digital HV-2S Servo 31kg/ .118sec / 78g


Look,

787 spec
Dead band: 0.0008 ms (Default)
Control System: +Pulse Width Control
Working frequence: 1520μs / 333hz
(RX) Required Pulse: 3.5 ~7.4 Volt Peak to Peak Square Wave
Operating Voltage: 6.0 ~7.4 V DC Volts
Operating Temperature Range: -10 to + 60 Degree C
Operating Speed (6.0V): 0.041 sec/60° degrees at no load
Operating Speed (7.4V): 0.033 sec/60° degrees at no load
Stall Torque (6.0V): 6.85 kg.cm (95.1 oz/in)
Stall Torque (7.4V): 8.44 kg.cm (117.2 oz/in)
360° Modifiable: NO
Motor Type: Coreless Motor
Potentiometer Drive: Indirect Drive
Driver Type: FET
Bearing Type: Dual Ball Bearings
Gear Type: Titanium Gears
Programmable: NO
Connector Wire Length: 15.0 cm (5.9 in)
Dimensions: 40X20X43 mm (1.57x0.97x1.69 in)
Weight: 79.5 g (2.8 oz)

767 spec
Dead band: 0.0008 ms (Default)
Control System: +Pulse Width Control
Working frequence: 1520μs / 333hz
(RX) Required Pulse: 3.5 ~7.4 Volt Peak to Peak Square Wave
Operating Voltage: 6.0 ~7.4 V DC Volts
Operating Temperature Range: -10 to + 60 Degree C
Operating Speed (6.0V): 0.145 sec/60° degrees at no load
Operating Speed (7.4V): 0.118 sec/60° degrees at no load
Stall Torque (6.0V): 25.00 kg.cm (347.2 oz/in)
Stall Torque (7.4V): 31.00 kg.cm (430.5 oz/in)
360° Modifiable: NO
Motor Type: Coreless Motor
Potentiometer Drive: Indirect Drive
Driver Type: FET
Bearing Type: Dual Ball Bearings
Gear Type: Titanium Gears
Programmable: NO
Connector Wire Length: 15.0 cm (5.9 in)
Dimensions: 40X20X45 mm (1.57x0.97x1.77 in)
Weight: 77.9 g (2.75 oz)


767's are the ones to go for then.

£123.41 delivered to you door

[sacko]

Thats not bad at all.

Is there any difference between the MKS ones
HobbyKing Online R/C Hobby Store : MKS HV-787 Digital HV-2S Servo 8.44kg/ .033sec / 79g

and the Turnigy ones
HobbyKing Online R/C Hobby Store : Turnigy HV-767 Digital HV-2S Servo 31kg/ .118sec / 78g

Got to be worth a try surely.

Even these look suitable for the Pro
HobbyKing Online R/C Hobby Store : HobbyKing 929MG Metal Gear Servo 2.2kg/ 12.5g/ 0.10sec

Which works out at £10 deliverd for all 3! Lol

[GravityKills]

...
I have heard reports that some of the MKS sponsored pilots have gone back to the 767's after using the 787's and reporting they are TOO fast! Don't understand how they can be too fast but that is what I have heard!

A possible explanation:
The slow maximum speed of conventional servos dampens oscillations from the driven mass.
For example, imagine we attach a small weight like a saucer or whatever to the servo. It takes a while to accelerate, but it can never exceed the maximum speed of the servo. When it then stops, it stops from a relatively low speed.
A high-speed servo, on the other hand, is able to accelerate the same mass to a higher speed. When it stops, it will overshoot more.
In other words, the inertia of moving parts becomes more important, when the servo is faster.
This is a guess only.

[PsiLo]

Well i got the Turnigy HV767's form hobbycity. They were actually £129.36 delivered to my door, chose normal airmail rather than EMS and they were sent by Hong Kong post instead of that crappy swisspost Arrived in 5 days

As I understand it the Turnigys are rebranded MKS.... I asked their support if they would restock the MKS versions they told me the Turnigys are made by MKS so they won't stock the MKS anymore (they used to have the MKS 767 but now don't).

I did look at the 787 but felt the 767 is plenty quick enough for me and has 4 x more torque than the 787 which I felt would be needed on the 6HV with it's long servo arms.

I am fairly sure that Grant_Beltcp has some 787's coming this month for testing so he will be able to give a report on how they are on his N5, he will also have a fly of the 6HV when it is built and can give his opinion of how the 767s perform (he is a much better flyer than I am and therefore will be able to comment better than I!)

One important factor as I have found on the 6HV build, they are a good bit taller than a normal standard servo so mounting could be more of an issue, bear this in mind!

[Jamin_00]

I would prefer the torquier of the 2 myself

[PsiLo]

You looking at these for the Avant 90E build Ben?

[Jamin_00]

The next heli yes, what ever that may be

[sacko]

Is there an MKS Tail Servo on Hobbycity?

Anyone know what model number it is I should be looking out for?

[Jamin_00]

I could never find one myself.