DS3400G Tail servo on 6V

[Silenus]

I am starting a build on a new Mini Titan this weekend and I'm just a tad concerned about this one point. My setup using 3 DS285's and one DS3400G, a Castle Creations Phoenix 35 ESC, and a separate SportBEC BEC. The SportBEC has a switch for the option of running 6V to the radio system.

I have heard 6V is fine on the cyclic and powering the gyro, but I been seeing and hearing all this talk about using step down regulators on tail servos so they don't run at 6V. However...I see JR's specs specifically show both 4.8 and 6v ratings for the DS3400G. I shouldn't have to step down the voltage to that servo, right? Just wondering what experiences others have had with this. Thanks.

[Coolice]

Hey,

Your using all JR servo's looking at the servo numbers listed?
If so dont use 6 volts at all as JR servo's are not designed to run 6 volts, they are all rated to 5 volts max.
Futaba's run happily on 6 volts but JR's do not and so I would not risk it.
.

[Silenus]

So...if they are not meant to run at 6V then why does JR specifically show on their website speed and torque ratings for 6V on both those servos? :-/
http://www.jrradios.com/Products/TechnicalSpecs.aspx?ProdID=JRPS285
http://www.jrradios.com/Products/TechnicalSpecs.aspx?ProdID=JRPS3400G

[Pinecone]

The servos that have problems running on 6V on the tail are Futaba servos.

The S3154 micro, S9253 and S9254 tail servos, etc, are not rated at 6 volts. The S3154s WILL burn up run at 6 volts. People have reported tha the S9254 will work on 6 volts REGULATED.

Realize that when they talk about 4.8 volts and 6 volts, they are talking the nominal voltage for 4 cell and 5 celll NiCd/NiMH packs. A 4 cell, 4.8 V pack will be around 5.6 - 5.7V off the charger.

[Coolice]

Hey,

Ah, thats different as most JR's do not like 6 volts.

As can be seen from teh specs then I got this wrong, run the little JR on 6 volts without problems.
.

[Rocket Man]

I have been running a JR 3400 in my Lepton all year with zero problems.

I am using a small 2s Li-po radio pack with the Align 3 amp regulator. It powers my RX, Hi Tec servos, Futaba 401, and the 3400 - no drop down diode is necessary. I checked the specs and this is one reason I set it up this way.

Enjoy,

Ron

[Silenus]

Thanks guys. Sounds good. I will set up at 6V and let her rip! :thumbup:

[fsusmithc2]

Yes, 6v is a-ok with those JR servos. I've been running them just fine that way in my 450.

I think most good digitals these days are 6v ok except for tail-specific ones like the 9254 and 9256 or 8700G and 8900G for example. I'm looking at re-doing my 600N with 8717s and the G7703D gyro with the 8900G. Should be fun! Some people are running the 8717s at 7.4v (probably not recommended).