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View Full Version : Traxxas servos on VXL compatibility with Futaba


RMJ22
05-11-2009, 07:44 PM
Hey guys - On the E-Revo VXL I plan to replace the TQ Tx and Rx with my Futaba radio (T7C heli radio - I grew running 2-stick Tx before they came out with pistol grip and prefer it). Will the Traxxas servos match up with my Futaba R617FS receiver if I replace the connectors with Futaba connectors? i.e. do the run the same voltage and work the same way? :unsure:
ProcessRacing
05-11-2009, 07:51 PM
Don't Helis run off of 4.8V? That may be an issue. Connectors should work, if not you can just shave off the orientation tooth on the servo connector.
filmmaker
05-11-2009, 08:14 PM
Yes they will work just fine..
But you should run a non 2.4g air radio for surface use
RobWilJas
05-11-2009, 08:31 PM
Yes they will work just fine..
But you should run a non 2.4g air radio for surface use

Did you type that wrong? It is perfectly fine to run a 2.4Ghz air radio with a surface vehicle, it is however illegal to use a 72Mhz AM or FM radio with a surface vehicle.
filmmaker
05-11-2009, 09:42 PM
Yep kinda messed that up,
you shuld not use a non 2.4g air radio for surface use..
Shelby VNT
05-12-2009, 11:05 AM
Heli radio gear can run on either 4.8 or 6 volts, so that is a non-issue. You'll just fine using any Futaba gear with these new trucks. I'll probably switching the radio gear over to Futaba equipment right away.
filmmaker
05-12-2009, 12:44 PM
most all radio gear can run on 4.8 to 6v
Cirkus
05-14-2009, 10:57 PM
It's the gyro's in heli's that run on 4.8v. The servos all run 6v just fine and your Rx will drop in no prob.
ProcessRacing
05-14-2009, 11:00 PM
It's the gyro's in heli's that run on 4.8v. The servos all run 6v just fine and your Rx will drop in no prob.

I didn't know it was the gyros that needed the 4.8v. Thanks for the info.
Cirkus
05-15-2009, 09:08 AM
I didn't know it was the gyros that needed the 4.8v. Thanks for the info.
no problem.
buzzsaw 46
05-17-2009, 12:06 PM
It's the gyro's in heli's that run on 4.8v. The servos all run 6v just fine and your Rx will drop in no prob.

Not entirely true some gyros do require 4.8v but I have quite a few gyros that run fine on 6v. I have a CSM SL720 gyro that can take 8.4v.

I have also burned up a few tail servos trying to run them @ 6v, one only lasted about 5 min in a hover. That was a drag, $50 LTS-3100G digital tail servo gone in less than 5 min. The servo was over 150F on the case after the motor froze.
Shelby VNT
05-17-2009, 12:55 PM
Exactly. It's the gyro servos, by Futaba, that you need to watch. They aren't rated to run on 6 volts. The gyro itself can, but the servos cannot. There are step down regulators that allow you to run the gyro on 6 volts, and the power for the servo is stepped down to 4.8 volts, but that is getting a little off topic.
buzzsaw 46
05-17-2009, 02:13 PM
It is off topic but misinformation is almost worse than no info.
BP-Revo
05-17-2009, 02:33 PM
Most voltage limits are on the servo's themselves, not the receiver. The receiver usually just passes through whatever the input voltage is, and either has a small linear voltage regulator to power itself, or it just runs on a variable voltage.

For example, the Spektrum RX work with anything from 5 to 9 volts. So you can easily power them with 2S lipo (7.4V Nominal, 8.4V fully charged). The question is whether your servos will hold up to that kind of voltage.

Hitec has a new set of servo's out that are designed to work with lipos and put out a whopping 400+ oz of torque at that voltage.
Peowraaku
05-17-2009, 04:39 PM
we're talking about an electric vehicle here. the esc has to be regulating a lower voltage for the rx and servos or else you couldn't run 12 NiMH/3S LiPo.
Shelby VNT
05-17-2009, 04:53 PM
we're talking about an electric vehicle here. the esc has to be regulating a lower voltage for the rx and servos or else you couldn't run 12 NiMH/3S LiPo.

Moot point, in my opinion. The fact remains that there are receivers and servos that can still run directly off of LiPos, without any internal or external BEC regulators. JR servos are also compatable with the higher 7.4 volt LiPos. Talk about snappy and responsive!

I know guys running 7.4 volt receiver battery packs on electric vehicles, helis, ect. Even Castle's external BEC can be programmed for 4.8 to 12 something volts of output. It's the future of RX and servo technology. It just isn't here yet with all brands and types.