Who has the best Lipo's

[RandyatBBY]

I like RC Polly and TP

[Punisher 67]

Anybody not checking lipo temps while setting up a boat...just like you would a ESC, should not be running lipos! We all get a bad one...even the big names do.

Sure, if you know you are running peak amps for the ESC and cells you then take the risk of cooking any packs out there....HK or any other. 2p is minimum with hot setups.

Does any one truly belive you can pull 90c from a cell that says that is its peak? Come on. 450 amps....for even a brief moment???

Good set ups should be able to run any decent 40C lipo....or your set up is way overboard or again...you should not be playing with lipos.

Hello Jeff

I am anal about checking , temp , amp , volt and with what prop on setup and logging the changes as I go up in prop or cells , true enough nobody's going to come anywere near spiking at 90C without a mushroom cloud looming over the boat but running 22C with 20/30C cells is really pushing it compared to running 22C with 45/90C cells . theoreticaly maybe they could breafly take the load ( nanosecond.... )

two banks of 45C cells is what I am looking at , it will certainly work better that my 20/30 polyrc's

[Brushless55]

I hear ya fluid, and I know you are a racer so you have been there done that.... but, I only run the better of the HK cells in my high amp big boats... the newer 40-50c packs.... I've had good luck some have had bad with many different lipos.... I don't race either, maybe if I did I would notice more of a difference... but I still hold my boats to the "pin" the whole time shes on the water so they get run pretty hard.... some have good luck and some have bad luck with all sorts of things... my 40-50c turngys cost around 25% of the comperable Thunder power....

that's what I've bought because the price was so dang cheap!
5000mah 2s hard packs for 18bucks each

[Jeff Wohlt]

I know you watch your stuff, Peter. My point was bascially your information. Running hot set ups should not be a problem for most as long as you check your stuff and monitor temps. Most people have no clue how many amps they are pulling...until POOF and then they wonder why.

Yes, many people think they can pull 100 amps constant for 4-5 minutes out of 5000x30C and it just wont happen...at least not a propped up system.

Who would have thought you could run 140 on NMHI? I also think lipos from HK have gotten considerably better since the 25C poofs. There are certainly many more HK lipos out there than probably any other cell but that would be just a guess...just from shear price. I just bought more 5000 40C HK cells for $24 each. I pull 125-130 amps and feel plenty safe.

[Punisher 67]

Jeff as always your info is well noted and appreciated.......................

[Jeff Wohlt]

Jay T. has mentioned many times on this forum...a good set up should not need so much safety margin....he has even spoken of no water cooling with the right set ups. Of course, he has the history and experience to know what is not a good combo. Most of us just do the old fashion way. Check and re-check after a minute, etc.

20=25C cells are so yesterday....40-50C is now the norm for most of us.


Many of the big name cells come from the same place (not from the USA) but nobody wants to tell you that info.

Probably my biggest safety factor is FEAR!! LOL.

[bigwaveohs]

Good luck. Here is what happened when a club member ran his first mile race with HK cells. They were in a 10S Hurricane mono with Schulze 40-160 and Lehner 3060. This was a top-end build that had raced for a couple seasons with ThunderPowers. The only change was to the HK packs - 25C rated same as the old TPs. One pack of the four was sorta undamaged....

What happened to the boat?

[Anbjorn]

Hello Peter,
I don’t have much experience with other brands than Hyperion.
But the few runs I have been able to do with my Sniper 45 the 35C Hyperions certainly looks promising. Also the price on these packs are now quite reasonable.
I have not been able to log what current I draw yet, but what I have seen is that the packs keeps the voltage up very well, even under hard acceleration.
Even at very little capacity left, the voltage did not go below 40volt on 12S.
Temps are very low, about 42C (107F)
I would say that if you are to use a LVC on these packs you need to use no less than 3.4volt pr cell.
For next season I am going to get myself an EagleTree system so I can get proper log data from my setup. I will post the results here at OSE
If you are going to use your Schulze 40.160 on 12S I think you will be very close to its limit with the 3080/7. I would certainly use a smaller prop than the X460 for the first runs until you know where you are.
I assume you will use your current EagleTree setup in this boat?

Here is my 12S Sniper 45 setup:
Lehner 3080/7 with your very nice mount
Schulze XXL 40.300WK
Schulze 300amp connectors
4 x HYPERION G3 VX 22.2V 6S 5500 MAH 35C/65C (12S2P)
5mm wire drive
M&D Strut with a 1/4" to 3/16" stub shaft.
Prop X460/3
Some of you have probably seen this before and this is maybe not the right place to post a video link but anyway here it is again.

http://www.youtube.com/watch?v=aDIZx-rwxHI

This is from the second time I tried the boat, trying to figure out the correct CG.
In the video I had quite a lot of lead weights taped to the bow of the boat so the CG was way too high. With no weights the CG where to low.
I have done a few runs afterwards with less weight, but the water where rougher and no video.
It would be interesting to hear how you plan the lay out of your build.
I will put the packs back into the boat and do some measurement regarding where I think the correct CG is for my boat.
Happy New Year to all!
Anbjørn

[sailr]

don't forget, I offer a great deal on the hyperion packs to OSE members. PM me. You'll be pleased by the prices.

[Punisher 67]

Great info Anbjorn

The lay up will be identicle to my Neu 2230 powered Sniper and for now I will leave it at 10Cells like the red boat , I just want to duplicate what I did in the Red Sniper into the Orange one , maybe just a hint faster with the Lehner..........

Beautiful lake your video is at

Jim thanks for the heads up on the cells

[Fluid]

What happened to the boat?

We filled the hull with water to protect everything from the fire. The packs continued to burn until they cooled off enough to stop - water will not extinguish a LiPo fire immediately. After everything dried out he was able to salvage almost everything but the packs. The Schulze went back to Germany but is now powering the boat to speeds above 75 mph. He did buy decent packs this time....





.

[bigwaveohs]

I've been wondering what to do if we ever had a problem with the HK packs...sounds like you submerged everything to keep it cool until packs burned out. I'm sure it's just a matter of time before we have a LiPo fire. Good input...thanks!

[rawsonreyes]

great story they never seem to end if i did not know better i would not ever buy a lipo pack but it's just what you use it for, it's physics not magic for the years i have been on forums i would say some stuff is just not good and some great but it's about the use of the packs in which project, as fluid says don't mix and match, competition setup high end lipos /fun run best bang for the buck.