Overkill? 30kg/403oz servo
 

i need at least 18kg servo for my heavy truck with bigjoes on commandos

I have Proline Steering kit
The new JR looks very good but it might be overkill.

DS8711 ULTRA TORQUE SX
Specs
Type: Digital Ultra Torque
Torque: 347 oz/in @ 4.8V, 403 oz/in @ 6V (30kg@6V)
Speed: .19 sec/60° @ 4.8V, .15 sec/60° @ 6V

Milder version

DS8611A Digital Ultra-Torque MG Servo
Torque: 260 oz/in @ 4.8V, 320 oz/in @ 6V
Speed: .18 sec/60° @ 4.8V, .15 sec/60° @ 6V
Gears: Alloy w/ metal/nylon B1 gear

Or the classic Hitec HS-5955TG
Speed: 0.19 / 0.15 sec @ 60 deg.
English Metric
Torque: 250 / 333 oz.in (4.8v/6v) 18.0 / 24.0 kg.cm
Size: 1.57" x 0.78" x 1.45" 40.00 x 20.00 x 37.00mm
Weight: 2.18oz 62.00g

Weakest and cheapest

Motor Type: Coreless
Bearing Type: Dual Ball Bearing
Speed: 0.24 / 0.19 sec @ 60 deg.
English Metric
Torque: 200 / 250 oz.in (4.8v/6v) 14.4 / 18.0 kg.cm
Size: 1.57" x 0.78" x 1.45" 40.00 x 20.00 x 37.00mm
Weight: 2.18oz 62.00g

Or am I just crazy and Futaba S9351 High Torque will do?
FUTM0236
Volts Torque Speed
4.8V 153.0 oz-in. 0.16 sec/60°
6.0V 192.0 oz-in. 0.13 sec/60°

I just cant decide. JR servos are supposed to be one of the best.

Personally, if money were no object, I'd get the strongest one if you have a high steering load. Also, be aware that the higher torque servos will require more power from your BEC; I wouldn't be surprised if that 403oz-in servo can take 2-3A average with 5-6A peaks.

333oz of power will be enough.

I run a JR Z9000T in my Muggy with 40 series Mashers. My servo puts out around 300 oz/in. or torque. It does the job, although I don't think that a 400 oz/in servo would be overkill. Just make sure that your BEC can keep up with the current draw.

UBEC can handle 3A cont. with 5A peaks. I dropped JR email asking for detailed specs of the DS8711.

Can reciever handle so high current going through?

It would depend on the thickness of the traces on the PCB, but I would say yes since they are kinda short. I would also keep the servo wire short to reduce resistance since it is pretty small wire.

would it be ok to do connect servo directly to UBEC? (+ and - to UBEC and - and signal to reciever) of course UBEC to reciever as well :)

There are ubecs that can do more than 3A continuous. They just cost a lot more.

I am quite happy with the Hitec 5955-TG I have in my Revo. It turns the tires with lots of authority. And it helps that I got it brand new for $75 (my employee price is $82).

^^ same here

I would have to vote for the 5955TG. I have one in my G2R and its plenty.

Also, even though JR's new servo has a whopping 400oz+ of torque, it has "just" metal gears. In my opinion, once you hit the ~200oz mark, you really need Titanium gears, and thats just what the 5955TG has.

The 5955TG should pretty much outlast your truck.

As I am still bit afraid of Hitec reliability a decided to go for 320oz JR 9000T - all gears metal

the 8611A is AIr version thats why one gear is plastic.

LOL! I guess this poll was quite useless then.. Look at the results /posts and what you bought.. :)

The hitec has got tough gears.

well the Z9000T has same parameters as HS-5955TG so everyone wins :)