Spartan on 4s?

[Smoothops]

So what is holding me back is getting the Spartan and wanting to go fast and it seem new prop and 6s lipo cause bad problems... So the question is if I was to get 4s lipo`s would i get fast speeds and no problems with the ESC and motor?

[Wade]

you know...that seems to be something that not many have tried...well at least i have not seen any threads about it. I have thought about going from my 6s to a 5s set up. but also heard that you should have the same amount of cells and not mix them (I.E. 2s + 3s) unless someone makes a 2 -1/2s battery

[Smoothops]

yo

Well we need the head honchos word of mouth in here then. I would be happy with 45-50 mph on 4s if it did not consist of me burning something up. So the question is would 4s 5000 mAh work? I mean we all want fast but I have a jato 3.3 and 55 mph is to fast unless you just trying to show off and do speed runs so i would imagine it would be the same on the water.

[dag-nabit]

you know...that seems to be something that not many have tried...well at least i have not seen any threads about it. I have thought about going from my 6s to a 5s set up. but also heard that you should have the same amount of cells and not mix them (I.E. 2s + 3s) unless someone makes a 2 -1/2s battery

I haven't tried it but here is a quote from an RC battery discussion that may be helpful.

Quote
Cells (or batteries) in series must be just about identical in all respects, except cell count. The use history must be the same. Why? Because the same current flows in all elements of a series circuit.

Batteries connected in parallel do not have to be identical in capacity or use history, but must be of the same cell count. Why? Because the same voltage appears at all elements of a parallel circuit.

I think Brushless has some experience with this, hopefully he can give you the skinny.

Kevin

[Smoothops]

thanks

Thanks for the input but was you saying that it would not work? I did not really understand.

[dag-nabit]

Well we need the head honchos word of mouth in here then. I would be happy with 45-50 mph on 4s if it did not consist of me burning something up. So the question is would 4s 5000 mAh work? I mean we all want fast but I have a jato 3.3 and 55 mph is to fast unless you just trying to show off and do speed runs so i would imagine it would be the same on the water.

Running 4S will take the load off the stock components which should help.

There are fewer reports of problems on the stock nimh batteries and 4S setups, but there have been failed components even on stock nimh batteries.

I think it is doubtful you will get 45-50 on 4S with the stock electronic components, If you prop up enough to get those speeds you will put the load back on the components.

With the right prop and trim settings I think you could possibly see mid to high 30's, maybe even 40 on a good day.

I haven't tried 4S, so I am speaking based on rough calculations and guesstimation, not experience.

Kevin

[dag-nabit]

Thanks for the input but was you saying that it would not work? I did not really understand.

No, I was responding to Wade's question, my response to your question is above.

I think you can run 1 2S and 1 3S battery in series for 5S and make it work as long as the capacity, discharge rating, and number of cycles (age) of the batteries are the same.

But I have no experience with this, so wait until someone confirms.

You can buy two 5S batteries and run them in parallel with no problem. That would give you lots of capacity for longer run times.

Kevin

[Alexgar]

Seems like alot of boat and money to do what a 270$ pb or aq can do 30-40 mph that is

[Smoothops]

yea

well money is over rated anyways, i ordered a UL-1 instead of the Spartan but it is a hydro and wanted to have a boat for the rough also. So if i can get someone to confirm that a 4s would work and me being a Traxxas owner on land i would love to be on sea as well.

[dag-nabit]

well money is over rated anyways, i ordered a US-1 instead of the Spartan but it is a hydro and wanted to have a boat for the rough also. So if i can get someone to confirm that a 4s would work and me being a Traxxas owner on land i would love to be on sea as well.

GoeVW27 has been documenting his runs on 4S and 6S in his thread: http://forums.offshoreelectrics.com/...ad.php?t=22331

Read through it, this will give you a realistic idea of what to expect of the Spartan on 4S.

Kevin

[Alexgar]

I will work on 4s it comes with 2 pack that are pretty much equal to 4s

[Smoothops]

I will work on 4s it comes with 2 pack that are pretty much equal to 4s

works on 4s, equal to 4s is this typo or am i just a newb.. And thanks for the info kev on that link couldnt really make out what was going on, but thanks.

[Alexgar]

the 2x 7 cell pack that come with it are 16.8, 4s lipos charge full to 16.8 so they are equal voltage but the lipos will be faster because they can discharge faster and more consistently

[Diesel6401]

you know...that seems to be something that not many have tried...well at least i have not seen any threads about it. I have thought about going from my 6s to a 5s set up. but also heard that you should have the same amount of cells and not mix them (I.E. 2s + 3s) unless someone makes a 2 -1/2s battery

You can run 5s. Many including myself do it ALL the time. As long as the packs are the same mah and c rating (i also prefer same brand and same number of cycles) you won't have a problem.

[Fluid]

As above, you can run a 2S pack and a 3S pack in series no problem, we do it all the time. The cells just have to be the same. Don't charge them in series unless you know it is safe to do so.

Running that big boat on 4S may be just as much of a problem as on 6S. For the same speed you will pull 50% more amps than a 6S setup - that is HARD on the electronics. If you prop so you pull the same amps with the 4S setup then your power is down by 33% and speed will be down 20-25%. The stock ESC will run on 2S so 4S is fine, but watch the amp draw - who is happy with a boat capable of 50+ mph but running just 40 mph?


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