Servos .... booster or Rx pack ??

lordnikon · #1 31-01-2013

I'm having trouble with my core esc what appears to be shutting down and resetting with heavy servo and throttle use on 1s lipo. I've tried a capacitor in the rx which helped a little but not cured it.

So is the solution to add a booster in aswell to bring the voltage up or to run a seperate rx (life) battery pack ? I wanted to run the car on Sunday and am rapidly running out of time to order whatever is needed to sort it out.

Anyone add some options or give any other ideas, not sure what others are doing when running with a 1s on 1/12th

levontraut · #2 31-01-2013

hi m8

on the rx i am running a cap and on the lipo side the esc comes std with one of those bank things... this it like that i find the servo and motor do very well and i do nto get any brown outs.

what servo do you have in your car??

lordnikon · #3 31-01-2013

Hi, the esc has a couple of caps attached to the + and - accordingly.

I've tried a savox, bluebird and a cheap hobbyking one, ironically the cheap one runs perfectly, but is quite slow !

I've ordered a couple of LIFe rx battery packs to plug straight into the rx and see if that sorts it. Fingers crossed.

sosidge · #4 31-01-2013

My suggestion would be to get a better servo. A Futaba 12th servo (eg 9650) would be ideal and is a long term investment that won't cause any troubles and won't need an extra rx pack.

lordnikon · #5 31-01-2013

Its 100% the servo's i have. I put a 6.6v LIFe batt into the rx directly and it all works perfectly. Ironically the cars were slightly under weight so this has balanced them up nicely

mark christopher · #6 31-01-2013

yup defo servo, futaba as sugested above!

JimboJames1972 · #7 31-01-2013

Savox servos (especially the 1/10 scale sized ones) are famous for being thirsty on current. Sure, they are good value and have good specs, but they seem to achieve these specs by throwing current at the situation...

Futaba versions are more current friendly, but less friendly on the wallet.

Most speedos with inbuilt voltage boosting circuitry put out between 2A and 3A to the servo and receiver. However, some speedos are not always able to maintain a steady voltage to the receiver and servo if you push the currents close to their limits.

So, if you have the "wrong" combination of speedo with poor voltage/current output and a thirsty servo you will almost definitely get problems.

My suggestion is that a receiver pack might offer a better solution that a separate booster. Boosters only offer the same 2A to 3A as your speedo so adding one won't really get you any further. I'm guessing that a receiver pack can supply more? Just keep on top of charging it between racing and you should be ok.

Hope this helps,

James

SlowOne · #8 31-01-2013

What you have experienced is typical of not running an Rx pack or booster with a 1S cell through a '2S' speedo. Either a booster or an Rx pack will fix it. It seems the system will work without an Rx pack/booster, but the servo runs very slow.

Having a better servo will make no difference to this situation. You have done exactly the right thing by fitting the LiFe Rx pack. You could also try an RC Dynamic booster instead of the receiver pack, but since you've got that now... HTH

mark christopher · #9 31-01-2013

Pete think you got that wrong, the core Speedo that the thread starter has is 1s comparable and many have found on the fb group that they don't like power hungry servos.

Gareth273 · #10 01-02-2013

Mark, what would you class as a power hungry servo?

mark christopher · #11 01-02-2013

Savox full size and low profile are worst, small 12th size are OK.

reg · #12 01-02-2013

Try running without the fan on to,that makes a difference,i run the small savox,with the powercap and no fan its fine with he Core speedo,i could be wrong but the spec on the power hungry ones state a speed at 6v and 4v or just 6v,the ones for 12th do 6v and 3v,dont quote me on theat though

dale · #13 01-02-2013

Quote:

Originally Posted by reg

Try running without the fan on to,that makes a difference,i run the small savox,with the powercap and no fan its fine with he Core speedo,i could be wrong but the spec on the power hungry ones state a speed at 6v and 4v or just 6v,the ones for 12th do 6v and 3v,dont quote me on theat though

+1 to this.

Core ESC
Savox 1251 Low Profile Servo
Cap on receiver
No fan

Works perfectly. Without the cap it was useless.

lordnikon · #14 01-02-2013

Didn't think about the fan guys, worth a punt thanks !

lardy37 · #15 01-02-2013

I know it might sound stupid, but what receiver are you using as I know a few guys at my local club had same problem when running savox servo with specktrum receiver and they had to use a really big cap to sort problem, I just put life battery in my sons and its fine

reg · #16 02-02-2013

I run a spektrum

lordnikon · #17 02-02-2013

Yeah spectrum micro rx with savox or bluebird servo

SlowOne · #18 02-02-2013

Thanks, Mark - my mistake. Yes, Savox and Spektrum is a bad mix, lots of forums have people saying that combo gives problems. No idea why since Savox seems to work with other receivers.

Gareth273 · #19 02-02-2013

Hmm. May have to rethink getting my lad a Spektrum radio then.

RogerM · #20 02-02-2013

You'd probably be better getting a different servo, Spektrum stuff is very robust. I'd never put Savox in any of my cars no matter what the rest of the kit is.

If you want a cheaper servo look at the Alturn ones, if your willing to pay a little more than Orion do some very nice servos.

I will say I run Futaba and yes they are a bit more again BUT I have never, ever had one pack up on me.