1/4 scale servo to run straight off 2s Lipo?

[newth]

OK, I'm sick of burning out servos. (Melted 1 of the 2 chips on PCB :( )
I've now got through 3. I keep robbing the good remaining chip, but I've now run out & another one has fried.

I think it's to do with the voltage dropping & then the current increasing to compensate for this & things melting.

Anyways......

Since I've already modded my axles to take 1/4 scale servos, is there a 1/4 scale servo that I can run straight off a 2S LiPo & throw the BEC in the bin.
Incidently, I went with stupid big servos to deal with my stupid big tires.

Thanks inadvance for any help.

Newth

[ik632]

Servo City has a few nice charts showing servos and acceptable voltage. Their prices are good to. Just pick if you want Hitec or Futaba and scroll down.

[newth]

Thanks for the reply. That's great.
I've been having read up & it sounds like its not uncommon for the hitecs to burn out.
I'm a little bit confused though on the servo specs. A few are stating Lipo ready, but the voltages are charted at 7.4v.
A fully charged Lipo is at a much higher voltage than that. What am I missing?

[ik632]

You know, I ran into that issue as well and couldn't get a straight answer. I guess it's probably worth emailing customer support at the manufacturer.

What I keep seeing is that all the "LiPO ready" servos that say they run off of straight LiPO also list 7.4v for the voltage. Technically a fully charged 2S is 8.4v and that's a bit higher than 7.4. I still run a BEC to my servo and let my ESC supply power to receiver.

I know this isn't a good answer but I guess if the servo says it's direct 2s capable then it should run at that and if it burns out send it in for warranty.

[newth]

I spoke to one of the shops I use in the uk, they seem to think it'll be fine. I've sent an email to savox to see what they say. I'm currently looking at their 0236mg servo.
It's a little bit bigger than my old hitec servo & I only just managed to get onto the clod axles! So I'm not sure it's the right one to go for yet.

I just like the idea of ditching the voltage regulator which feeds my servos. Be nice to clean up my electronics & get some reliability back.

[Charlie-III]

Originally Posted by newth

Thanks for the reply. That's great.
I've been having read up & it sounds like its not uncommon for the HiTecs to burn out.
I'm a little bit confused though on the servo specs. A few are stating LiPO ready, but the voltages are charted at 7.4v.
A fully charged LiPO is at a much higher voltage than that. What am I missing?

From what I've seen/read/heard, the spec is saying that it is OK to run off a 2S LiPO direct since the pack voltage will drop a bit quickly and then taper down to LVC. The 7.4VDC is a nominal voltage.
If you were to run off a decent external BEC, I would set it to 7.4VDC, or close to it, since the voltage should not vary much if at all.

Originally Posted by ik632

You know, I ran into that issue as well and couldn't get a straight answer. I guess it's probably worth emailing customer support at the manufacturer.

What I keep seeing is that all the "LiPO ready" servos that say they run off of straight LiPO also list 7.4v for the voltage. Technically a fully charged 2S is 8.4v and that's a bit higher than 7.4. I still run a BEC to my servo and let my ESC supply power to receiver.

I know this isn't a good answer but I guess if the servo says it's direct 2S capable then it should run at that and if it burns out send it in for warranty.

+1....also see my reply above.