Servo voltage

[Pro Driver]

This is a bit of a silly question but I have no idea about servo's, been trying to do some research about the voltage but im getting no where. I have a savage flux and I plan on upgrading the servo (bought some big joe's ) and I have found that the standard one does not cope well with bigger tires. 

 

I know that some servo's need a BEC as the mamba monster esc has 5.5v rating for servo. I want to avoid installing a BEC (because im lazy like that lol) and just want a high torq servo that I can just fits straight in, no modifications. 

 

if a servo has a rating for 6V in spec does that mean my esc wont be able to handle as it only has 5.5 rating?

 

I thought this one looks good:

 

http://www.hobbyking.com/hobbyking/store/__9765__Hitec_HS_7985MG_Coreless_Digital_Servo_10_4kg_62g_0_16sec.html

 

it has rating for 4.8V and 6V, if it has a rating of 4.8 volts that means my esc can handle it, it just wont perform as well as 6V?

 

thanks for help

 

 

 

 

[Si Coe]

Most servos can operate in a typical range of 4.8 to 6V. As noted they will run a little slower and have less torque at a lower voltage. You shouldn't need a separate BEC with that esc and a good high torque servo.

[Pro Driver]

Most servos can operate in a typical range of 4.8 to 6V. As noted they will run a little slower and have less torque at a lower voltage. You shouldn't need a separate BEC with that esc and a good high torque servo.

 

Thanks for comment, Its just that I have read about people using BEC with savox servo's because they can be glitchy. I guess it will be fine anyway

 

ive just seen this Alturn USA servo on modelsport. looks pretty good, you recon it would fit in savage?

 

http://www.modelsport.co.uk/alturn-usa-high-performance-race-servo-high-torque-/rc-car-products/359784

Edited April 27, 2014 by Pro Driver

[Hyper-d]

Not sure about the flux but I have an alturn in my savage x and is more than good enough for the job.if you do go for the alturn go for the aas780.much better than the 750

[shdaxner]

The two which you have linked to, I would of thought would not really be strong enough for a Savage Flux.

 

I had the Alturn one on my Hyper ST and found it to be a little lack lustre at times so I would imagine it would be slower/weaker than desired in the Savage.

I would personally look at something around 15kgs or more for the steering Savox's 1256 is quite highly regarded but pricey.

 

Something like this would be ideal - http://www.hobbyking.com/hobbyking/store/__16272__HK15298B_High_Voltage_Coreless_Digital_MG_BB_Servo_66g_20kg_0_16s.html super cheap too.

[Tug]

You're running the risk of browning out your BEC, this will be caused by using a power hungry servo. If you don't want to fit a uBEC, try using a Rx cap. These are cheap and can solve the problem.

[SirusDviruS]

Power hd 1501 is approx 15kg and

[Pro Driver]

thanks for the replies,

 

Is there any soldering involved with a RX cap?

[jony nitro]

Normally they come with futaba plugs, and plug in the Rx port Aux

[fatboyneil]

For a savage running big joes you want 20kg at 6v or better like the savox 1256 or 1232 but basically 20kg or higher but with a max voltage of 6v the power caps are easy to get or even make I do my own at a fraction of the cost http://www.ebay.co.uk/itm/251505764718

[Tug]

As above! On my Maxx trucks I have hitec servos that produce 24kg of torque at 6 volts, so a single servo is enough. On my ERBE I have two Savox 1258s rated at 9kg each at 6 volts, so 18kgs combined.

I have them all running on uBECs.

[Pro Driver]

For a savage running big joes you want 20kg at 6v or better like the savox 1256 or 1232 but basically 20kg or higher but with a max voltage of 6v the power caps are easy to get or even make I do my own at a fraction of the cost http://www.ebay.co.uk/itm/251505764718

 

great thanks, that looks like a perfect solution  

 

So this plugs straight into the receiver, then I wont have to worry about any servo glitching?

[Pro Driver]

As above! On my Maxx trucks I have hitec servos that produce 24kg of torque at 6 volts, so a single servo is enough. On my ERBE I have two Savox 1258s rated at 9kg each at 6 volts, so 18kgs combined.

I have them all running on uBECs.

 

I wont be aiming too high, I dont really want to spend much on a servo. the stock one is only 7kg in savage so double the amount should be good enough? say round 15kg like this one: http://www.modelsport.co.uk/alturn-usa-high-performance-race-servo-ultra-high-torque-/rc-car-products/371394

[Tug]

I'd say 15kg is the bare minimum, certainly no less.

[tonysmini]

I know you are trying to save money, but you are making a compromise that may just end up costing you more in the long run.

With the servo, go for the best one that you can. With a savage I wouldn't go for anything less than a 20kg, that way you have power with enough to spare should you get in a bit of a bind. As JC says on top gear, you can never have enough power.

As far as the cap or the BEC goes, try the cap first, it may work okay and you will be fine, but if you find your servo is a bit glitchy or your truck starts to stutter on steering or just acts odd, then you need the BEC. Even though your ESC can throw out 6v, it's busy powering itself the RX and the servos (plus lights and anything else you have running from it) Ask it to provide too much current and it may start browning out or even pop the internal BEC.

.you can wire a BEC with a Y lead so the ESC can power itself and the RX, and the full 6v/5 or 10a (depending on the BEC used) goes to the servo, really bringing it alive.

I build scale rigs and any servo over 12kg gets it's own BEC , once you try a servo on one you'll wonder why you never did it before.

[tonysmini]

http://www.msuk-forum.co.uk/topic/107870-bec-faq/

If you haven 't already, spend ten minutes reading through this. People ask this question all the time and eventually end up fitting a BEC.

As long as you can solder it's literally a ten minute job, plus the Castle 10amp jobs are adjustable with a CC link. If you need help there are lots of people here who can do it for you.

[fatboyneil]

Pro driver you look like you want a cheap bargain but something strong enough for a savage with big joe tyres then forget the alturn rubbish also the power hd your best bett is hobbyking servo finder but most are coming up like this http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=50467 now most you will need a bec to be safe just remember the old saying you get what you pay for and putting a

[Buggy4wd]

The high voltage servo seems able to use on lower volts.

XQ-S4116D for example,are good to use on 6.6V,although the torque are

down 5 to 10%.

[tonysmini]

It can but you're not going to get the best out of it, it will be weaker and slower and before long you'll end up wanting more from it.

[Pro Driver]

http://www.msuk-forum.co.uk/topic/107870-bec-faq/

If you haven 't already, spend ten minutes reading through this. People ask this question all the time and eventually end up fitting a BEC.

As long as you can solder it's literally a ten minute job, plus the Castle 10amp jobs are adjustable with a CC link. If you need help there are lots of people here who can do it for you.

 

Thanks for sharing this link, great stuff very helpful   I think after reading this a BEC is the safest thing to do if I am to spend