High Voltage Servos?
 

I asked this question on the radio and electronics forum and got 1 reply, so here it is,,,,,,,,going to be running a D8(Tekno V4) with Tekin RX8 with 4s lipos,,,,looking for options on a steering servo that is high voltage and has the torque,,,,,,,,thanks for the help!

Seems there are a variety of them out from a lot of companies.

I would say in general having 200oz of torque and .15 sec transit time are what I require for 1/8 buggy as a minimum.

I am curious though, are you going to be using a separate receiver pack or BEC to get the voltage up higher?

hitec 7950 is your best bet, or a spektrum 6090

Cain, cant they be powered from the lipo it self? Never gave that any thought, Im new to the 8th scale electric game, Nitro guy going electric(just wanted a change) i need help!

yes, however you mentioned a 4S lipo which is 14.8V . I haven't seen or heard of a servo that can handle that, only 7.4V servos. Now, that DOESN'T mean that no servos that can take that exist, but I just hadn't heard of any so I assumed you mean 7.4V .

If you are running 2 7.4V lipos, yes technically you can, however, personally I wouldn't as now you have one lipo getting drawn harder than the other and can get some weird balancing issues etc.

Best bet would be to use an external BEC in my opinion that you can dial in the voltage you want.

We used to do it all the time back when 1/8 electric got started to have a cheap ESC (the Mamba Max) that could handle 4S usage.

I would contact Tekin and see what they recommend on using a BEC with there RX8.

Personally though, I haven't see the need for more than 6V using a servo that has the specs that I mentioned at a minimum.

A nice very high torque servo with decent speed on 6V is this one:

http://www.servodatabase.com/servo/hitec/hs-5955tg

I just sold one as I got a faster servo, but the guy who got it is extremely happy with it.

I run savox 1268MG's in both my nitro and electric cars they are the best bang for your buck servos out!

Wow, im so GREEN to this High voltage electric game, its getting alittle overwhelming to me,,,,have no idea what a BEC is? If i decide to go with a power pack, where does it get mounted in the buggy and what type?

Can i use the same servos that I had in my Nitro (Associated XP 1015)?

yep;)

I was getting thrown off by High Voltage crap and getting ready to spend 100 bucks on a new servo and i can use the same ones i had in my nitro!!!!! thats good news for sure, this board is awesome, thanks for the help!

Same question here...

Hitec 7954sh for a Caster EX-1 powered by 2x 2S batteries.

I was thinking about wiring the servo power directly to a batteries and the signal cable in the RX but it would probably unbalance one of my batteries.

Options left:

- An external BEC
- A dedicated 2s battery just for the servo (I don't like this option)

Crazy ideas (not sure if possible...)

Is it possible to connect my batteries in parallel using the balancing cables while they're serially connect by the main cables to the esc? (i guess not...)

1. Get a BEC.
2. Get a Savox SB-2271SG "High Speed" Brushless Steel Gear Digital Servo
3. Enjoy!

Seriously this is one bad azz servo.

.06 with 277oz of torque. Also it's brushless.

Also you can make an adapter to plug into one of your 2cell balance leads, and power it directly off 7.4volts.

Get radiopost servos! Unlike Savox and some of the other High Current servos, they require less voltage from the bec. So, At most a capacitor is needed. I run the Caster EX1.5r, and I am using the green multi servo and 5ch receiver. I have zero problems with brown outs and such.

There is really no need for a receiver battery or an external BEC (battery eliminater circuit). All speed controls have a built in BEC capable of delivering 5 to 6 volts constant to the recreiver and steering servo. It does not matter what the input voltage is from the main pack. With a 2s, 3s, 4s, 5s and 6s battery, the speed control steps the voltage down to a constant voltage, 5 to 6 volts. Check the specs on the speed controls BEC if you want to know the voltage it will supply to the steering servo.

For e-buggy, high voltage servos are a waste. That is because the BEC is only supplying 6 volts. They will work, but you will not be maximizing their potential like you do with a 2s lipo receiver pack in nitro.

I agree with the recommendation to use a servo with at least 200 oz-in and a transit time under 0.15s at 6 volts.

Personally, I have a Hobbywing Xerun 150A speed control with a DS1015 steering servo in my Tekno converted D8 running on 4s.