Quark 125 & Lehner 1950/8
 

Hi Guys,
I just want to make you know how this configuration rocks.

I'm really near to finish my S-G Maxx and I'm using it as a 2WD Truck
(missing front center bone) while waiting for my order.
It has a strobe slipper with an ofna mod 1 51 spur and a 15 pinion,
it has a single speed trasmission from Gorilla/fastlane,
it has an UE 7.5 8 spider diff
it has (by now) road rage tires (40)
it's 5.2/3 Kilos of weight with batteries and body
and finally the beast:
a lehner 1950/8 with a Quark Monster 125B with two pack in parallel of
flight power EVO20 5S 3700 lipos.

It's a BEAST ..... Really impressive I must take a video ...
I reached 54C° for the motor and 53C° for the controller with the
softest setup for lipo and with the manual cutoff at 3V per cell (ambient
temperature = 30C° ... very hot).
Over 1880 watts, 97 Ampere, 35 minutes of bashing on the road and on
a dirty yard and stopped due to a servo arm problem.
When I went to charge the batteries, they were at 19.4 volts !!!!!!!!!!!!!!!!!!!!
Only about 1800 mah per battery of charge.
I think I'll be able to bash for over an hour !!!! Impressive !

The controller is refreshed from 2 fan and 2 heat sink. And it lies on the
alluminium with some silicon paste (the one you use for the PC cpu).
The motor has a fan under pushing air, and it will have other 2 fans on
the heat sink for the motor pulling the air to the sky. So I will have a
general airflow from the bottom of the model to the sky. I will also cut
the body on the top of it to make air coming out.

Here you'll find some photos of the story of the truck:

http://chroot.penguin.it/gallery2/ma...g2_itemId=1373

GO BRUSHLESSSSS !!!!!!!!

:)

Ciao,
Daniele

Looks good. One question though. Why Road Rages? Bow ties or Crime Fighters may have been better for bashin...IMO. Anyway, very nice! Would like more pics of the fan and motor set up! : )

You are surelly right. I just received a pack with inside 4 crime fighter 40
tires with velocity wheel with 23mm hex. And the motor fans/heatsinks.
That Road Rage tires were the first I had: I had them from a very great friend
of this forum. Anyway I was able to reach over 1880 watts only on the road,
not in dirty bashing, due to the better grip :)

Ciao !
Daniele

I run the crime fighters and love'em! great all around too. Waer fast oin pavement, so try to stay off that as much as possible, can be done, but hard on the tire. You'll really like the crime fighters! can't wait to see your final project!

I'm waiting some stuff from Mike, at this point I hope to hear him
on monday.
With a 2WD bashing is pretty uncontrollable.
I was wondering if with the 40 tires I would do better buying the gorilla
extension of the chassis.

BTW other photos within some hours :)

Ciao !
Daniele

I run the extension and like it a lot. U can use an mip center shaft like i do for the front. I have the bone to put in, but haven't becasue the MIP has held up so far and i won't replace it until I break it! I run the extended steel from Mike for the rear.

I like that 1950 8t myself. I run mine on a 6s system. It is great.
I average about 30 mins with a 3800 pack so you should be able to hit an hour with 7400 mah. Can't wait for pics.

The very same setup (batts and all, to the point) that I have lying here to put on a current project! :) Looking forward!

Cheers
DAF

Dafni you probably already have seen that racerx arms, that shocks, and so on :)
Serum sold me that !

Ciao :)
Daniele

How is it that the 3700s are enough for 97A draw? Is it that they are wired in parallel?

I have a 7XL Wanderer that gets pretty hot, would the 1950/8 run significantly cooler due to efficiency? My 9920 and batteries are pretty cool, but if I gear up at all they get hot. Present gearing only motor gets hot after 18 minutes -- 183f!!

The lehner should run significantly cooler due to efficiency yes, gearing makes big difference in that though too, gearing is touch and go, try a few up and down and see how she does...IMO 183F is toooo hot!

Yeah, I tried up and down. Down 1T and motor gets even hotter. Up 1T and ESC and motor get to 160f and it shuts down after 5 minutes. At 14T with UE diffs and the big mashers it goes for 8 minutes or so before thermaling, then will run another 8 or so before the batteries dump.

I have a fan on the esc, but only a heatsink on the motor. I need a fan on there too, but need to hook up a mount. Maybe Mike could make an integral motor heatsink/fan mount thingy.

My tires might just be too heavy also, this weekend maybe I'll try a lighter setup...

standard_63, this battery setup gives you 20C continuous, which results in 148amp! (and 222amp peak) Should be enough, eh? And yes, Daniele said 2 in parallel.

Cheers Daniele, so the stuff stays in the family! Nice to hear Renes parts found a good home. Keep it up!

How many cells there standard?

Speaking about nominal data, we are about 16 cells nimh.
But I see my lipos, nominal 18.5 volts, stay without trouble between
21 and 19 volts for at least hald of the charge. This make them very
near to 18 nimh cells.

Some other photos of my truck in a short time :)

Daniele

Leroy, 5S of those cells, especially in 2P, feel like 20 Nickel cells to me. Keep in mind Ni cells drop voltage under load. And with almost 150amp as a continuos rating on Danverz' setup, he won't have to worry about voltage drop.

Sure Dafni you are right, but there is a bad face of the coin, the weight.
The truck is about 5.2 5.3 Kg . Not really light.

I just posted some other photos in my album.

http://chroot.penguin.it/gallery2/ma...1373&g2_page=9

I added the antenna support, the servosaver, some blu alloy screw caps
(I love them, they make everything cooler) and the 2 motor heat sink with
fun.
I have to say 3racing 3x3 fans sucks a lot :) Really more and more better the
muchmore ones (we are talking abut 5/6 volts fans).
I cannot wait for the roll cage, it's on the way :)

Ciao !
Daniele

I think you got the wrong question out this. It was for standard_63.

I would probably guess close to a 18 cells with out the voltage droping.
20 cells at 1 v is 20 volts and it takes some serious draw for that. I caught the 5s 2p configuration. The 5s 2p is probably just as light as 20 nimhs but more run time for sure.

Ops :)

With my setup and on the road with the road rage tires I saw a peak of 97
Ampere and a peak of 1880 watts. And I'm running 2WD.
I think with the second differential and the with the grip of the front tires,
on the road, I can achieve 120 130 Ampere. It seems to me to be reasonably.

And sure, it's a huge draw :)

Ciao,
Daniele

I'm running a 4s lipo -- 2x 2s1p 5000mah PolyRC packs.

My run did consist of a backyard track session with some wheelies and roostertails, then immediately out to the street for 10 or so full speed passes, and then back to the yard for more jumping and roostering. After 18 minutes of that on my 12lb. truck with heavy tires, I'm not sure 180f is so out of line for the 7xl? I need to try a fan on it next.

A 8XL would certainly fix part of your problem. Thats alot for the 7XL. A 8XL will have more torque and handle the heavy truck better.

Hi guys,
this morning I broken tooooo many items in a tooooo high jump with a toooo
bad "landing".
My Maxx hit the groud with the front skid plates, and it curved it, broking the
servo carbon fiber servo plate of the gorilla chassis.
I think, do I make it again by myself with a bigger carbon fiber, or do I
buy the alloy one ? I don't know yet.

BTW my dpr-100 is not able to record more than about 24 minutes, using
a resolution of 10 records per second and 2 temp monitor.
Here's a graph of my first 24 minutes of bashing.
As you can see I surely will achieve the hour. And I am very very happy
with the temperatures. Red one is the ESC and yellow one is the motor.

Ciao,
Daniele

http://chroot.penguin.it/maxx001.jpg

This is a bit off the topic, but how do you get the graph? I'm thinking you have something wired in to collect the data? what is it? thanks, sorry for the hijac!

Eagle tree will record the data for you.

Hey Leroy, where do you get the set up though? You must have to connect it to the system some how...

Go to eagletreesystems.com and check out the Micro Power E-Logger. Just plug a Deans into, and the battery into it, and it records all the stuff you have sensors for. Metalman has one and loves it. They also have a LCD panel for it now so you don't have to use a comp.