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RPP Cross 2018
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Thread: Race Tractor tribute build

  1. #1

    Default Race Tractor tribute build

    I've always loved the 1:1 Race Tractor truck.
    build thread for that can be found here
    https://www.pirate4x4.com/forum/gene...cetractor.html






    - I started a few weeks back on my own Power Wagon build - but that ended up being bought before I'd finished it by a pal.

    thread for that build is here http://scalebuildersguild.com/forum/...-d-Power-Wagon

    Anyway - after he took that truck off my hands I immediately ordered up another proline power wagon body to start another - to keep this time.

    Decided to copy the Race Tractor a bit more closely this time.


    Parts List so far:

    • Front two thirds of some SCX10 chassis rails
    • SCX10ii Skid Plate
    • SCX10ii Kit Transmission
    • VP Transmission top shaft
    • Motor / ESC - undecided at the moment
    • RC Nerds 3D printed accessories / grille
    • Shocks - final choice not decided on but a mixture of Traxxas and Dravtech shocks so far for mockup
    • Vanquish Portal Axles with overdriven front
    • Power HD Servo for the time being
    • CNC Custom Wheels 1.9 beadlocks
    • LockedUP RC wheel rings
    • PitBull 1.9 Rock Beasts
    • Crawler Innovations Foams
    • VP Twin Hammers Trailing Arms
    • VP Currie Anti Rock Sway Bar



    The chassis rails have been chopped off just behind where the skid plate finishes - they were left overs from when I chopped them up to use the rear half of them on a 6x6.

    The skid and trans have been flipped 180 degrees and I've bent up a couple of simple brackets for a front trans support.


    The VP Portals will be running axle mounted servo setup and I've made up my own M4 stainless links for it.

    Out the back I'm going to try using some VP Vaterra Twin Hammers length rear trailing arms to allow me to run the Race Tractor style twin rear shocks.

    [SIZE=1]- - - Updated - - -[/SIZE]

    I've realised I've not taken any decent photos yet of the chassis setup - will get some shortly - but this is the general idea





    [SIZE=1]- - - Updated - - -[/SIZE]

    If you've seen any of my previous builds then you'll know I have a bit of an addiction to making roll cages
    and this truck is no exception!

    I've made a bridging plate that runs between the 2 x chassis rails at the back of the skid, and this acts as one of the main mounting points for the rear cage structure.

    There's still a bit more bracing to add - but you get the idea.

    All the cage is made out of 4mm outer diameter, 2mm inner diameter Stainless Steel tubing.

    The joints are all "filleted" together and then either silver soldered or stainless mig welded together.

    Also put a couple of tabs on the back to let me run the rear sway bar.














    I've tried "loosely" copying the general cage layout of the 1:1 truck - and will ultimately make some rear side panels too





    [SIZE=1]- - - Updated - - -[/SIZE]

    For the front end I was lucky enough to get a pre-production sample of the RC Nerds 3D printed front grille for this body - and wow! it's awesome.


    2 piece part with crazy details - available here if you are interested
    https://www.shapeways.com/shops/rc_n...ower+Wagon&s=0










    The front tube work was a bit of a pain to make.
    Again - loosely copying the 1:1 truck but without hiding quite as much of that awesome front grille.










    Made the main front lower bar of the bumper out of some steel C channel with a triangle out out of each end, then tapered round and silver soldered shut the cut line

    the main headlight surround was the toughest bit to get right!






    Things still to do:

    • make some tabs for bolting the various front headlights / spotlights too and soldering them on.
    • sort battery mount - will be running twin 2200mah 3S batteries, one on either side of skid
    • fully brace up the rear cage
    • solder on captive nuts for rear body panel mounts
    • sort out a fuel cell / rear radiator
    • rear lights maybe??
    • decide how to mount the body - on the last power wagon I used some rare earth ring magnets which seemed to work well
    @ScaleBuilt on Instagram

  2. #2
    Join Date
    Dec 2017
    Posts
    389

    Default

    Looks awesome!

    I didn't know you could solder stainless... how strong are the joints?

  3. #3
    Join Date
    Apr 2017
    Posts
    148

    Default

    Looking nice.

  4. #4

    Default

    Quote Originally Posted by dagabba View Post
    Looks awesome!

    I didn't know you could solder stainless... how strong are the joints?

    yeah - you sure can
    http://www.harrisproductsgroup.com/e...be-brazed.aspx


    I've done quite a few full on cages like this and never had a joint break once. And I let my 5 year old son drive them so they've taken some abuse!

    I use 55% pure silver solder on the joints. But i do take quite a lot of care to fillet the joints properly using a 4mm chainsaw file by hand, so I get quite a lot of contact area.

    On joints that aren't so visible I tack the joint together with stainless Mig and then will finish it off neatly with silver solder later on.

    the final soldered joints end up looking so neat after a clean up. On the joints that have purely been soldered together I also hardly need to do any tidying up work at the end of it. I usually just end up vapour blasting (a really gentle form of sand blasting) the finished cage solely for the purpose of getting off the burnt on flux residue.


    The only downside is that 55% silver solder aint cheap! But on the flip side you also don't need a super expensive torch setup - I just use a MAP gas plumbers torch

    this is what one of the cages looks like after blasting
    @ScaleBuilt on Instagram

  5. #5

    Default

    Quote Originally Posted by valheru View Post
    Looking nice.
    @ScaleBuilt on Instagram

  6. #6
    Join Date
    Apr 2017
    Posts
    148

    Default

    Quote Originally Posted by 55ovalcharlie View Post
    yeah - you sure can
    http://www.harrisproductsgroup.com/e...be-brazed.aspx


    I've done quite a few full on cages like this and never had a joint break once. And I let my 5 year old son drive them so they've taken some abuse!

    I use 55% pure silver solder on the joints. But i do take quite a lot of care to fillet the joints properly using a 4mm chainsaw file by hand, so I get quite a lot of contact area.
    I have a follow up question, which flux are you using with the 55%Ag solder or are they of the flux coated type?

    Personally, I've been using bronze flux coated rods to do my brazing with decent success, but tends to produce big fillet joints.

    Thanks

  7. #7

    Default

    Quote Originally Posted by valheru View Post
    I have a follow up question, which flux are you using with the 55%Ag solder or are they of the flux coated type?

    Personally, I've been using bronze flux coated rods to do my brazing with decent success, but tends to produce big fillet joints.

    Thanks
    I use Johnson Matthey “easy-flo” flux with 1.5mm thick silver solder rods

    I’ve never liked the flux coated rods personally
    @ScaleBuilt on Instagram

  8. #8
    Join Date
    Dec 2017
    Posts
    389

    Default

    That's really helpful, thanks!

  9. #9
    Join Date
    Dec 2016
    Location
    NoVa
    Posts
    626

    Default

    Really cool rig!

  10. #10

    Default

    thanks guys
    @ScaleBuilt on Instagram

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