***__ The 1/8 Onroad Think-tank __***

Here are a couple of pics under the hood. It's a bit agricultural (as I like to call it) but for testing purposes that is all I needed. The next stage will see a CNC'd engine mount with integrated heat-sink fins, and the aluminum battery tray will be replaced with a carbon fibre. The wiring is very messy atm and as you can see I have an Eagle tree data logger in there to monitor the current draw, engine RPM and temps while testing. The ducting over the speed control was due to help the speed control keep cool (I was testing in 35-38 Deg. C ambient) It also looks agricultural but did its job well.

[Sammus]

Wow that thing rips! nice work mate!

[pipeous]

sounds like a friggin jet coming down the front little straight. dam that's impressive. a few of us have been talking about building some 8th scale brushless on roads. now that looks like something that'll scare the pilot (can't call it driver at those speeds ;) )

[Sammus]

If these are just for the serpent then maybe http://www.hobbycity.com/hobbycity/s...idProduct=6421 would be nice. Some people don't like them because theyre cheaper and chinese made, but for around $100 for a 2500 6s pack you probably can't do much better. The seem to fit your size constraints stated earlier, it could mean making up a different mount though as you'd only need two. or do go a 3 pack setup they make them in 2s too, thin as well for lower cg.

[captain harlock]

Wow!

This thing is a rocket!

I just got my MRX-4X from Serum a few days ago.

I'm doing some tweakings here and there and I'm also waiting to get a nice highend motor with a good esc.

I haven't made much progress on the project, I have only just received my speed control back from MGM after having the latest firmware installed.
Attached are a couple of 3D drawings of my motor mount I want to have machined up. There are a couple of minor details missing from the drawings but they are the first drawings before revision.

Cheers Andrew

Took it out for a run at the local RC drag club today. Best run was a 1.9?? @110KM/h.
The local guys said they had seen plenty of nitro 1/8 onroad cars go down the strip, and even though top speeds were similar my ET was 3-4 tenths quicker due to how hard it was leaving the line.
Overall I'm very happy with the top speed as with this project my goal was a similar top speed to my nitro counter parts, now if I can only shed 1Kg of weight out of this thing to get it down to 2.5 Kg it will be a force to be reckoned with.

It's been months now since my MGM failed I then ordered a V2 MMM and it failed within seconds of turning it on. But the good news is my MMM V3 just turned up woot woot I have tested it in the car on the bench. It powered up and calibrated as it should and I can't wait to hit the track (when it stops raining).
I need to get a new video up on youtube for all the non believers.

http://au.youtube.com/watch?v=gGlx5_-r1rU

[auto2]

just curious with the MMM v3 why dont you try gearing it up to do 75 with a one speed and see if it handles the 180's OK. that would save some weight. i cant hear in your vid where it is shifting.

Originally Posted by auto2

just curious with the MMM v3 why dont you try gearing it up to do 75 with a one speed and see if it handles the 180's OK. that would save some weight. i cant hear in your vid where it is shifting.

It does change very early for a reason. The reason I went with the 2 speed was to reduce some of the currant draw (less heat) being produced when accelerating from low speeds and to hopefully slightly increase runtime.

Not sure what you mean by "180's ? But I intentionally limited the top speed achievable by the car, hence the top speed wouldn't exceed that of a gas powered 1/8th onroad. This way they can't complain that it is too fast to race against them at my club

I would at some stage like to reverse the pinion and spur eg. 20T spur and 48T pinion. That works out to a theoretical top speed of 643.06 km/h (400.33 mph) or drag adjusted 221 km/h 138 mph - 66% loss (Thanks to BrianG's calculator) That would be a handful!!!

[Ryu James]

Countryhick,
i love that you have stuck with this project for so long. i have 3 that i am working on now that will most likely take a few months to get them all done. one of them is a 1/8 scale on road with a 3speed tranny(strictly going to be a top speed runner). anyway, the car looks great. cant wait to see more vid of it. you MUST check out this post. it was the first post i ever saw here at RC MOnster and it's why i joined. when i saw how clean this conversion was i knew the guys here must know what they are doing. it is a brushless Serpent posted by Serum. tons of pics and an absolutely beautiful build. maybe give you some ideas for your carbon fiber work if you havent completed already.

http://www.rc-monster.com/forum/showthread.php?t=6281

Originally Posted by Ryu James

Countryhick,
i love that you have stuck with this project for so long. i have 3 that i am working on now that will most likely take a few months to get them all done. one of them is a 1/8 scale on road with a 3speed tranny(strictly going to be a top speed runner). anyway, the car looks great. cant wait to see more vid of it. you MUST check out this post. it was the first post i ever saw here at RC MOnster and it's why i joined. when i saw how clean this conversion was i knew the guys here must know what they are doing. it is a brushless Serpent posted by Serum. tons of pics and an absolutely beautiful build. maybe give you some ideas for your carbon fiber work if you havent completed already.

http://www.rc-monster.com/forum/showthread.php?t=6281

Serum is the man around these boards!!! Funny you say that thread was the reason you joined the Monster forum as it is the same reason I signed on . I haven't seen him around much lately but I'm sure in his lab somewhere, he is building something new to blow our minds

Is your onroad setup a Shumacher??

I will take some new pics in the next few days now that the MMM is in and the MGM is out! It looks a little neater than the last pics I posted.

If you have some build threads for your projects, "link me up"!!

[Ryu James]

Originally Posted by Countryhick

Serum is the man around these boards!!! Funny you say that thread was the reason you joined the Monster forum as it is the same reason I signed on . I haven't seen him around much lately but I'm sure in his lab somewhere, he is building something new to blow our minds

Is your onroad setup a Shumacher??

I will take some new pics in the next few days now that the MMM is in and the MGM is out! It looks a little neater than the last pics I posted.

If you have some build threads for your projects, "link me up"!!

how did you know my on road was a Schumacher? it is! its the Menace GTRe 1/8 buggy-chassis-turned-onroad with a 3speed tranny. it is not as nice as a Serpent by far but it should be a fun car. i ordered a Neu motor for it but the wait was 6 weeks so i am holding off on that and i just went and got a Castle motor today. we'll see how it does. i am hoping to get it running today. i am waiting on some carbon fiber but i am just going to use wood or alum for temp purposes today just to see how it runs. i will post some pics when i get it setup.
another fun project right now is a custom Assoc. RC8T. hoping it turns out. going all out on this one.
here is the thread of my Losi 8T i recently did. i love this truggy. it does over 60mph(i think that is around 120kmh) and is a blast to drive!

http://www.rc-monster.com/forum/showthread.php?t=15876

[What's_nitro?]

Very nice build, Countryhick! I can't wait for the new video!

Took it for a test spin today. First thing I looked for after giving it a boot full was the punch control!!!! (to turn it down) It's incredible the amount of torque these NEU 4 pole motors produce. So after getting a feel for the car again, I gave it a couple of flat out runs WOW!!!! I forgot how fast this thing is...

So after a few speed runs I bring it in just to keep and eye on temps. I was surprised at how cool the MMM runs (compared to my old MGM) the speed control was lucky to be a couple of degrees above ambient, needless to say the fan was not running either. The next thing I wanted to test was how smooth the MMM was from a stand still to a slow crawl, again WOW!!! This thing feels like one of my old sensored motors from my touring car (they were super smooth down low) there was not even a hint of cogging. So after keeping an eye on the temps for while longer (still barely above ambient) it was time for some more high speed passes. On about my third pass (@ around 120Kph) I ran over a piece of bark on the road, this was enough to allow wind to catch under the front of the body and over she went. I pretty much wrote of a near new body due to it sliding on it's roof for around 25-30 meters.

I know it's early days but I think the V3 MMM is going to be one solid controller.

I'm going to the local RC drags on Saturday, I will be taking my video camera so I should have some new footage up after the weekend.

Here is a pic of the body (after the roof slide)