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  1. #1
    RC Racer
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    Smile DIY Low CG chassis!

    I got tired of flipping the truck and have bad corner handling.

    Searched around and found Thunder Tech's Outlaw chassis and got very interested! What did not interest me was the price tag, $135 + shipping to Sweden + custom fee! I dont think so....


    So, lets bring out some aluminium, jigsaw, ruler, calippers..

    This is not a copy of the TT outlaw, but many ideas are borrowed from the images I could find. It seemed as a simple and good chassis for DIY!



    A big sheet of 3mm aluminium.




    The base of the bottom plate is cut out and drilled.


    A lot of measuring later:


    Found some brass bushings I used for steering posts.
    I also swapped out the stock nylon bushings for ball bearings.


    My modified 2075 servo. I fitted the metal gears from a HX12K in the traxxas housing and switched the top and bottom covers to make it fit.


    Cut out for the lipo


    Made 4 stand offs and screwed the two chassis plates together


    Started fabricating the spacer for the battery holder. Its made out of nylon


    Next up was fabricating the frame to hold the lipo in place



    More to come...

  2. #2
    RC Racer
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    The tray cut out and mounted.


    I made the battery tray a bit longer than needed so in case I get longer lipos they will fit with no modifications needed. A foam spacer is mounted in front of the ******* lipo. The foam and lipo can be moved to adjust weight bias, but if I want the lipo more forward I have to cut the tray to make room for the cable coming out the side of the pack.





    Painted the chassis black with regular spray paint. Lets see how long it stays on







    After a couple of runs I hade a lot of heat issues with the small VXL motor. The sun has been cooking us here in Sweden for some time now. About 30C (86F) in the air.
    I hade the motor just above boiling point once. Thats no good.

    Time to swap it out for the big guns!

    A leftover XL 1900kv motor and a big cooler with 40mm fan.
    I also switched over to 32p and choose 22t/54t which gives a theoretical top speed of 70km/h or 43MPH.



    Now it rocks!! Yes it does
    Ive gone through at least 20 packs since I finished the build and I am very very pleased with the outcome.

    I'll post three clips I have on youtube.
    First of is running a 3S 5800mah 25C on tarmac with Pro-line Caliber SC M2's, trying to flip it.
    The second clip is running on grass.
    The last clip is the same setup running paddles on the beach today! Man that was a lot of speed and fun

    http://www.youtube.com/watch?v=XVD9ZkbmhDI

    http://www.youtube.com/watch?v=aw3eklkvkAk

    http://www.youtube.com/watch?v=ad4W7k53gsE

  3. #3
    RC Racer
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    very nice!! i wish i had some talent(and money) to make a handmade lcg chassis.

  4. #4
    RC Qualifier
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    looks exactly like a metal version (even down to the cutting/shape) of the thundertech one

    looks good though and looks like you did a good job with it

  5. #5
    RC Turnbuckle Jr.
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    Wow! I'd buy that if it was in production :P
    EMBE/ Savage X
    x2 BL slash
    Ultra lx1e

  6. #6
    RC Turnbuckle Jr. pavmentsurfer's Avatar
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    NICE JOB... on of the best home made chassis ive seen on the forums since i started...

  7. #7
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    very nice job!
    It looks quite professional. I have always wanted to build one of these myself, but I don't have the resources...yet
    I am lucky I don't have any money.

  8. #8
    RC Racer
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    Thank you so much guys!

    Telnets: The shape is copied as good as I could from the original chassis. Just to make the nerfbars fit as the original.

    Im already planning a fiberglass version of this one, just to get the weight down further.
    The alu is twice as heavy (500g) as stock chassis (250g)

    pavementsurfer: Thank you very much! Very nice to hear someting like that!

  9. #9
    RC Champion
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    looks great!

    a quick suggestion, maybe drill out a few lrger holes to dish some weight out on the top plate
    Lead, follow, or get out of my way!

  10. #10
    RC Racer
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    Thank you!

    I thought about making a few bigger holes in the top plate, like TTs alu chassis, but I think it will weaken the chassis.
    Just a few small drilled holes probably wont make any difference Im afraid.

  11. #11
    RC Turnbuckle Jr. rag6's Avatar
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    Sweet mod. Really like the finish. Hope it stays black!
    Ya can't polish fertilizer...

  12. #12
    RC Champion
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    Thought about simply cutting some weight relief holes in the upper deck to reduce the weight and get it closer to stock?

    Similar to this:

    http://www.fastlanemachine.net/prodd...lm21600&cat=17


    Edit: Would help if I read all the posts in here. I don't think it would significantly reduce strength, otherwise why would FLM and other brands that make aluminum chassis do that?
    Last edited by orion; 07-12-2010 at 08:57 AM.
    E-Maxx 3905 - Rustler 3707 - Slash 5805

  13. #13
    RC Champion
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    Im impressed, mark. Wow! Very nice!

  14. #14
    RC Racer
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    Thanks rag6 and super Z!

    orion: I dont know how hard the aluminium I used is.. im pretty sure its not as hard as the real chassis which is 6061, thats why I dont like the idea of cutting it to reduce weight. I think it will also reduce strenght and bend more easy if I make an ugly landing.
    The fiberglass version will be alot lighter I hope.
    Or shall I make it carbon fiber?

  15. #15
    RC Racer
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    VERY AMAZINGLY PERFECT! All the credits man... such a peice of art.

    Can you provide drawings for the chassis in scale so that we can copy it for our slashes over here?

    Tack sa myckett!
    The Most Bashable/Washable Truck of the Year

  16. #16
    RC Racer
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    Thank you!
    I dont have any drawings on this project.. Maybe I can make one while I make the new CF or GF chassis, then Ill post it up.

    You've got pretty good swedish going on there
    Var så god!

  17. #17
    RC Qualifier
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    if you get a metal tranny case the whole chassis would act like a heat sink
    E-maxx 3905
    outlaw RPM VXL Slash
    summit

  18. #18
    RC Racer
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    Good thinking! To bad they are a bit expensive though..
    Ive got plans on a sand rail build which will have alu tranny case for cooling.
    Maybe Ill buy two while my wallet is open

    I see in your signature you run the Outlaw. Is it the GF version? What do you think about it? Does it crack/wear or is it holding up good?

  19. #19
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    no i got the cheap one

    http://i198.photobucket.com/albums/a...0713102316.jpg

    Edited for image size.
    Last edited by cooleocool; 07-14-2010 at 09:19 PM.
    E-maxx 3905
    outlaw RPM VXL Slash
    summit

  20. #20
    RC Racer
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    Thats the one I meant, GF, glassfiber.
    So what do you think about it so far?

    You have a nice and clean install!
    What rear springs are you running?

  21. #21
    RC Qualifier
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    I got them in December, but i think they are losi blue springs.

    EDIT what radio are you running
    Last edited by Omega Convoy; 07-14-2010 at 01:06 PM.
    E-maxx 3905
    outlaw RPM VXL Slash
    summit

  22. #22
    RC Turnbuckle Jr.
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    Chasis looks good, I run a long kd motor with that same heat sink.

  23. #23
    RC Enthusiast
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    What if I got some CF, it would be lighter than this, and how strong do you think it will be? I'm am so doing this.

    Or is there such thing as high impact Nylon sheets?
    Last edited by KillaGeek; 07-16-2010 at 02:06 AM.

  24. #24
    RC Competitor
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    I am going to draw on my old rc rock crawling experience and cut an lcg out of acetal (delrin) sheets. Will be a dual deck design based on the rustler chassis.

  25. #25
    RC Racer
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    Omega: Its an Eurgle 3ch 2.4GHz system. Works good after some fixing
    I run E-maxx red springs in the back and it softens up the truck a whole lot. Makes it more predictible than stock progressive.

    Ducati777: Tnx What temps do you get with the L motor? And what kv are you running?

    KillaGeek: I talked to a guy in our swedish forum about CF and he thinks the bottom plate should be 60 or 70 aluminium to withstand impacts and wear. The top plate can be made in CF.
    Accualy I got some CF and epoxy today and will soon start rebuilding my top plate to save some weight.
    Ill post pics and measures when I get to that.

    Shadowwalker: Sounds interesting! Is delrin stiff enough?
    Post a build thread on that one, Ill check it out!

  26. #26
    RC Turnbuckle Jr.
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    2700 kv, used to run HOT HOT HOT, but I put that big heatsink on, now mid 140's is my top.

  27. #27
    RC Racer
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    Ok, thats not bad at all for an L motor.

  28. #28
    RC poster
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    how do you cut aluminum safely, and where can i but a sheet like that

  29. #29
    RC Racer
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    If you have a new , sharp, semi coarse blade on a bandsaw-any craftsman bandsaw or something similar.....it will rip through 1/8" or even 3/16" aluminum like it is paper. You should also use a bit of beeswax on the blade. This will help to keep the blade teeth clog free. I work in a metal fab shop and am constantly amazed at how easily you can cut aluminum on a normal , non-heavy duty bandsaw. If the blade is nice and sharp, it cuts it like its wood and you can carve it out just like wood (laterally). You can buy a sheet of aluminum from any metal fabrication shop, or maybe even a hardware store. 6061 is tougher for sure and not much harder to cut with the band saw. You can probably buy a square foot for 20 bucks or less?. Just call some fab shops for prices before you go out. When a blade at work is new, I can cut up to 3/4 inch thick aluminum like it was butter. I would even imagine a little table top bandsaw with the right blade would work wonders on 1/8 or 3/16's aluminum. Remember, beeswax helps alot to keep teeth from getting gummed up with aluminum after a while.
    Last edited by defeatest; 08-14-2010 at 10:41 PM.

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