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3s vs 4s battery
#1
Hey guys,

I´m flying with a 215mm frame using 30a 4x1 ESC and Racerstar 2205-2600kv motors with 3s batteries.

I would like to buy a 4s to see the difference, and I have few  questions:

1 - Is there any setting required other than the battery settings for the alarm on Cleanflight ?
2 - What should I expect in terms of performance ? is this a huge difference ?
3 - Any hardware change required for this ?

Thanks
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#2
Don't know how you're powering the FC or what it's requirements are, but make sure the FC is not over powered, this goes for your video equipment, both VTX and camera as well.....you don't wanna let the magic smoke out. The motors and ESC's should be fine. You will notice quite a difference on 4S.
"Damn the torpedoes!!!  Full speed ahead!!!"
[-] The following 1 user Likes sirdude's post:
  • flabombarda
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#3
(07-Jun-2017, 12:48 AM)sirdude Wrote: Don't know how you're powering the FC or what it's requirements are, but make sure the FC is not over powered, this goes for your video equipment, both VTX and camera as well.....you don't wanna let the magic smoke out.  The motors and ESC's should be fine.  You will notice quite a difference on 4S.

Hi Sirdude, 

FC is currently powered by BEC (ESCs), this should be ok, I just noticed that the Leds I have are 12v (regular strip leds) I guess they will support this extra voltage (I guess or I hope !)
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#4
If you are using any throttle expo on the PID tuning tab, you might want to reset your throttle_mid (you'll hover at a lot lower throttle input).  If you find the quad too "hot", you can try a shallower pitch prop for awhile (what fun is that though?)  Tongue

You'll probably love it so much that your 3S cells will start collecting dust...
[-] The following 1 user Likes sloscotty's post:
  • flabombarda
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#5
Thanks for the advice about the PID, at this point I have very aggressive PID for Rolling especially I´m curious to see what happens :-)
Will give it a try !
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#6
On 3s you might not notice too high PIDs that much... 4s makes a big difference, so maybe be careful at start. Also depending on props, the amp draw might increase a lot especially on those high kV motors
[-] The following 1 user Likes fftunes's post:
  • flabombarda
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#7
(07-Jun-2017, 02:54 AM)fftunes Wrote: On 3s you might not notice too high PIDs that much... 4s makes a big difference, so maybe be careful at start. Also depending on props, the amp draw might increase a lot especially on those high kV motors

Hi fftunes, 

Yes, in this case I´m using  2205 2600kv motors
And yes, I´ll use a different profile at the begging as the response on 4s should be fairly different !

Thanks
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#8
Yes 4s feels PUNCH love it much better then 3s

4s gets you from trouble quick by punch or wise versa

Regards
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#9
On my first few flights I had both 3s and 4s batteries and very quickly found that I was better with 4s batteries. The reason being the responsiveness. The quad did what I wanted it to do when I wanted it to do it. If you've got a quad with rates turned up real high but it doesn't have the power to deliver those kinds of rotations then it's harder to predict what it'll do. Eventually I gave away the last 3s battery that I had on here to xtopher cause it just didn't make sense to keep trying to fly it.
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
[-] The following 2 users Like Carl.Vegas's post:
  • flabombarda, Drone0fPrey
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#10
I started off on 4S Lipos and I don’t have a real comparison to 3S (only 2S on a RTF Walkera).
For your electronic parts just check what the max voltage is for each part. Start from the outside and work your way in (I find it also helpful start from the PDB, because here you have the full voltage from the lipos):

Motors?
ESCs?
PDB?
FC?

Then:
VTX?
Camera?

Possible LEDs?
Ore other components

And if you have a voltage down stepper for FC or camera etc. check also what the max. voltage is for this.

You can usually find all the specs online.
- Kleinerbug_FPV


Quad Garage: 1x KISSed QAV 210 on RS2205, 1x Betaflight ARC 200 on RS2205, 1x whooped FuriBee F36
[-] The following 1 user Likes Kleinerbug_FPV's post:
  • flabombarda
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#11
My PDB supports 2-4s, the same for motors and ESCs.
FC is powered by BEC (ESCs).
LEDs are the only concern as they are powered by the PDB on the same rail that comes from battery (in this case max 16.8v on 4s considering each cell giving 4.20v)
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#12
I haven't added LEDs to my custom build or the second ARF that came with a ton of them partially because I don't fly at night where it would be cool to see the zippy little lights... but also because they're a pain to manage when there are so many other things to manage.

I hope you figure it out though!
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
[-] The following 1 user Likes Carl.Vegas's post:
  • flabombarda
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#13
1 question about motors.
2205 2600kv vs 2005 2300kv -> witch one is more powerful ?

I understand the kv measure how many RPM you get applying 1volt, does that mean than the 2600kv is better in terms of power ?

For instance, I´m using on my 215mm build 2205-266KV with double blade 5030 carbon propeller. Do you think changing props to something like 4045 would have any benefit ? I have this propellers here so I may try during the weekend just in case.

thanks
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#14
(08-Jun-2017, 03:11 AM)Carl.Vegas Wrote: I haven't added LEDs to my custom build or the second ARF that came with a ton of them partially because I don't fly at night where it would be cool to see the zippy little lights... but also because they're a pain to manage when there are so many other things to manage.

I hope you figure it out though!

Carl, if you are flying FPV, Leds are not as important as they are on LOS mode . for FPV flights, flying solo, my view is that leds are more cosmetics than an actual need, unless you lose video and need to revert to LOS.
[-] The following 1 user Likes flabombarda's post:
  • Carl.Vegas
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#15
(08-Jun-2017, 03:54 AM)flabombarda Wrote: Carl, if you are flying FPV, Leds are not as important as they are on LOS mode . for FPV flights, flying solo, my view is that leds are more cosmetics than an actual need, unless you lose video and need to revert to LOS.

That's a good point... 

I fly LOS very little but I can see how it would be a big help for identifying which quad is yours and which way is forward.
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
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