Rustler VXL Trailer
 

Just wanted to show you my Rustler VXL Trailer. I will make a longer and better video in the future. (It's a bit short, but it's a Trailer)

http://www.youtube.com/watch?v=D3QeGykTbcU

Will definitely be looking forward for the whole thing! Nice editing and great clips of the VXL!!

A 1350mAh 3S Rhino powering a Velineon motor? Really? I'm hoping that capacity is a typo.

Great video! And really nice colors. What camera do you use?

Yeah that doesnt sound right to me either. How much run time are you actually getting?

It was a camera of my friend, I dunno which one he has. But the colors are made like that by editting it. I editted it with Adobe Premiere Pro CS3.

A 1350mAh 3S rhino didn't sound good to me either. But I thought I would just try it out. (A few months ago) And the LiPo didn't get above 90F, which is great I think? The runtime is something like 15-20 minutes. (That's long for a 1350mAh LiPo, isnt it?)

EDIT: Btw, it was my first movie made with Premiere Pro, so better editting of the next video will be for sure!

It's gotta be mismarked. There's no way that a Velineon motor is going to pull so little current that 1350mAh will last that long.

Well it definately is a Rhino 1350mAh 3S 30C LiPo. Yes, it's very very small. And as I said, it doesn't get above 80F, that's good isn't it? (After 15-20 minutes of running)

The Rustler does wheelies on EVERY speed and topspeed is 76 km/h (48mph) Measured with radar gun...

Interesting, but I'd say pickup a ~4000-5000mah lipo of the same spec for future use.

Great trailer though, very very pro looking, like something you'd get on one of these DVDs featuring the r/c equivalent of bmx and skater stars. :yes:

In a few days I should get my Eagle Tree V3 Logger, I will do some measurements with it and post it.


Wow, thank you for the compliment. I really didn't expect such comments :yipi:

+1

I but Zippy 2650 MaH 3s packs because the 5000 MaH ones are always out of stock. I am very happy with the run time. No idea how long I get but its plenty as I have at least a quarter of the battery left(when I charge it on my onyx it shows how much MaH it put back into the pack).

btw I am also running this in my vxl slash and I will see how it does come this winter in racing in my 13.5 xxxt and my stock spec slash...I have high hopes for them.

As for the video, I am really impressed. Great camera work and I will as I think many people here, will be looking forward to your next video. Keep up the great work!

The 5000mAh 3S packs should be awesome for a long runtime! Maybe some Turnigys, they are in stock now IIRMC.


And another compliment, damn. Thanks! :yipi: (I really didn't expected that)

To get 15 minutes on a 1350mAh pack, you'd have to be drawing an average of ~5A for the entire run and depleting 100% of the capacity. I'll have to see an Eagletree plot to believe it. The math just doesn't add up at all.

The Eagle Tree should come next week. I'll make a log and post it here on RCM :yes:

i thought you ment, like trailer, towing and such, but thats nice too! lol, vid does look great!

Nice vid...especially like the end when the truck is sliding on it's roof for what seems like forever:lol:

Thank you. My whole body looks like shit now because the car slided to oft on his back :lol:

My stock Rustler did it's highest speed (50.1 mph GPS) on it's roof!

Very nice vid

Well, I just drove with my Rustler. Same setup as in the video. And now I know my Rhino can deliver 60C peak! This is incredible, isn't it? And what about the pack voltage? The minimum is 8.87, is this critical or is it good? And why doesn't my LiPo cutoff comes in? It's set to 3.0V so that would be 3 x 3.0 = 9V and the LiPo got under 9V?

Anyway:

http://img139.imageshack.us/img139/7913/rustleret.jpg

Your packs are definitely not 60C, not even a 60C burst. If it were a 60C burst pack, your voltage would not drop below 3V/cell at that load level. 8.87 is definitely not healthy for that pack.

From what I see, you're pushing the very maximum limits of that pack and will be lucky if they last very long before puffing, especially when you start dipping below 3V/cell.

I would need to see seperate volt,watts and amps graphs to give an accurate C rating judgement (the overlaid graphes obscure the voltage lines when its dipping low).

On the LVC issue, it seems it just isnt sensitive enough- I would raise ot to 3.2v per cell, maybe even 3.4v.

I was just looking at the graph again. But the LiPo only got 2 times under 9 volt. And I was driving in grass hill up and down. Maybe because of going full throttle up hill got the LiPo beneed 3.0V/cell?

http://img70.imageshack.us/img70/7913/rustleret.jpg
http://img90.imageshack.us/img90/7913/rustleret.jpg

As you see it sometimes get over 80A and the voltage doesn't drop below 3.0V/cell

i dunno!
i'd say it's doin a pretty darn good job!!:party:
yeah so it's pushing the limits...but it weighs what? fark all and i bet it was super cheap too:party::yipi:
looks like a heap of fun, the worse thing i did for my rustler is use the 3s 8000m,ah packs, too heavy but cant argue with 1 hour runtime under race conditions (that's how i got 2nd in the MT unlimited 1 hour mains :rofl:, all the nitro's broke down/ran dry)

What is bad/normal/good for a LiPo? A voltage drop under 3V/cell is bad? Exactly 3V/cell is normal and 3+V/cell is good?
It weights... well... yes, nothing :lol: It costed 15 dollar!
And yes it jumps like hell because it's awesome light! And I get a runtime of 15+ minutes. As you see in the graph I was at 13:30 minutes or something and I used 1050mAh of the capacity.

Wow, 1 hour... That's damn long, but I still like my 15+ minutes and super light car :) But for a 1 hour race that's perfect ofcourse!

Going under 3.0V/cell on a Lipo is not good at all. You'll shorten the life of the battery at a minimum. While you may be getting away with less battery, you're certainly not promoting a long lifespan of the battery running the way you are. IMO, it's just not safe to run a battery in application where it will be routinely subjected to currents beyond it's burst rating.


Also, IMO, if the Lipo was an optimum choice for the application, it should not drop consistently below 3.5V/cell until nearing the end of the run.

~9.7v @ 80amps = 60c.. ermmm.

It is actually putting out 60c bursts- the voltage stays around 3.3v per cell, the current being drawn is up around 75-80amps, so 80amps / 1.35amps (1350mah pack remember) = 59.xxx. If you go by the heavier bursts, then its putting out around 40-50c bursts.

The weird thing is that some of the smaller bursts around 65amps are what cause the voltage to drop down to around 3v per cell. That I dont quite understand myself, could do with some more expert input & interpretation of the graphes.

It is still very impressive for such a small pack though, would love to see how a larger version of the same cell will perform. :yes:

I'm not sure where you see it staying at or above 9.9V at 70+A? It's routinely under 9.9V at most any current over 40A.

I'm not saying it's a crappy pack by any means. I just think it's way overtaxed in that application. Hitting peaks of 40C+ on every trigger pull is not a safe use of a Lipo, period. I stand by my comments that this pack is not being used safely and if it goes poof, it's absolutely the fault of the user for putting it in the wrong application.

Its around the 375 second mark- but that is a fairly isolated incident. It does drop down around 9v with most 50amp bursts, but thats the thing- it isnt consistent. One 70amps burst drops it down to 9.7v, another a few minutes later drags it down much lower...

I would like to see a couple of these pacsk in parallel, that would boulster the performance for sure.

Oh, no doubt. I'd bet that if the capacity of this pack was doubled, the voltage would be maintained to 3.5V+/cell for just about any peaks.

I say it's a TEASER .......:yes:

Well, I got 2 of those packs. I use them both in the Rustler VXL so they have about the same cycles. Maybe I should try it once and log it?

If you've got the time and don't mind, it would be a great reference point. Also, can you plot the voltage and current on the same graph for it?

+1, that would be great. Just need a parallel adaptor for the packs.

I can make a parallel adapter for those packs. But what about charging them? How should I do this? My father and me got a conversation about this and can't get it how to make that work...

I woud just charge them seperately like you would normally, otherwise you have to make or buy a special charging harness to charge them in series- depends if you're the impatient type of person, or dont mind waiting a couple hours between runs.

Byte, sup with the full version of this movie ;) ?