Guido: Scale TTC Bronco 2015 Scale Nats Updates
 

Many years ago I spotted a rig on the internet that I fell in love with upon first sight; it was John Reynold's Fat City Bronco. Then I saw it in the 2002 Four Wheeler Magazine Top Truck Challenge and ever since I’ve wanted to build something similar for the day when I enter TTC. That day is not going to be anytime real soon so I decided that I would do the next best thing, build a scale version of my TTC Bronco.
The name of this rig is Guido. 8)

Even though JR’s Bronco is the inspiration for what I want to build there are some things I would do different on my 1:1, you will see those things come up in this scale build.

I always work better under pressure so I decided that the Montana scale comp put on by Unimoger would be the perfect deadline to shoot for. As of this time I have 16 days until I leave. :shock: I actually started this a few weeks ago so I will try to bring this up to speed fairly quickly.

Pictures:
First is the inspiration for this build:

Let’s see how close it ends up. Thanks for reading and I hope yall like it.8)


First off is the suspension design. I am not a big fan of coilovers, the reason being that if you break a link and the axle rotates you can toast a coilover and then yer done. With coil springs you can repair the link and continue on the trail. This has happened on the trail before with my friends and in TTC it is important to be able to repair things quickly. Another thing I like about coil springs is that if they are captured on both ends they provide some resistance to the axle droop, coilovers do not. Plus, it's been a long time since I built a coil spring suspension RC and I just love the way they look and the realistic performance.
For these reasons I decided on coil spring suspension front and rear. Now, on most TLT rigs I have seen people mount the coil springs under the frame because that is where the holes in the axle housing are to mount the coil. On my 1:1 I would have the coils on the outside of the frame for two reasons. Putting them out closer to the tire gives you better stability and you can run a longer coil spring which means a softer spring rate for the same amount of travel.
To get the springs out further on the axle I made these mounts out of 22ga steel. These move the springs out enough to run them outside of the frame rails.


That brings us to another point. Since I would be building the 1:1 in my garage I would start with a ladder frame rather than building a full tube chassis. I say this only because it would be easier for me to build with a known starting point rather than starting from nothing.
I chose to use 1/8” thick aluminum for the frame rails, I would rather use ¼” but it is hard to find at the hardware store. I had this particular frame laying around from another Bronco build I started last year so I decided to save time by using it. There's alot of extra holes in it but I'll have to live with that for now. After Montana I'll cut out a new frame since I doubt I'll have enough time before. :lol:


Index:
Phase 2 start 2008
ready for chassis paint
Phase 2 finished for MSD Scale Nats

Phase 3 start 2010
steering servo and engine mount fab
chassis painted
Phase 3 finished for MSD Scale Nats

Phase 4 start 2012
Custom AR60/10 axle fab start
new interior fab start
machine work on axles and steering box fab
front suspension and steering fab
scale calculations and interior assembly
Electronics waterproofing
front AR60/10 axle finished
Phase 4 finished for NWSC


2013 Update Start (Back in black and green)

Here's the mockup with the cage sitting on the frame. The cage is being made from 3/16" brake line and welded with my MIG. The cage will tie to the frame at 4 points under the cab, similar to body mounts, as well as at the front and rear. It took me days to figure out the right way to tie it together but so far it's looking good (pics of that later).
http://www.rccrawlermedia.com/rcc-al...190_9093_R.jpg
http://www.rccrawlermedia.com/rcc-al...190_9092_R.jpg
http://www.rccrawlermedia.com/rcc-al...190_9089_R.jpg
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Griz means Biz!

looks great dude;-)

:lol::lol: Thanks guys, I was torn between building a scale version of my Bronc as it is now or this one. I decided that since I won't have the 1:1 of this for a while I'll do the scale one now. I have high hopes for how this should turn out. "thumbsup"

So are you saying that you'll be turning your Bronco into the real thing?

The front suspersion is another area where I will build mine different. I have been so happy with the Duff long arm suspension on my 1:1 Bronc that I think I'd actually use it on my TTC rig. They are super tough and articulate well.

The Duff arms are based off of 2" OD tube so I used 1/4" brakeline (0.25" is 1/8 scale of 2") to build my radius arms. The short links to provide axle wrap control have some flex in them. I did this by not using the steel ball in the Traxxas rod end and replacing it with Dubro neoprene fuel line. This allows enough flex in the link to articulate pretty good.
http://www.rccrawlermedia.com/rcc-al...189_8956_R.jpg
http://www.rccrawlermedia.com/rcc-al...8955_R_001.jpg
http://www.rccrawlermedia.com/rcc-al...189_8954_R.jpg

No, my Bronc will remain mostly Bronco.
When I build my TTC Bronc I will start from scratch. I'll likely buy an aftermarket frame from Advanced Frameworks or Matkins, pick up a fiberglass tub, and get the VIN by buying a Bronco glove box door and stock frame.

I'm doing my links like that on my Scout,freakin' awesome Griz.You dah man!

:lol: Thanks DJ. Caint wait to see yours, I showed you mine. :lol:

I was flexin it out on a pop can tonight, they seem to have plenty enough flex so I think you'll be happy with them too. "thumbsup"
This thing has alot more flex than my comp rig.

This thing is looking SWEET!"thumbsup"

real nice work Griz. "thumbsup" be glad to see it done.

nice work, like the 2 linked rear.

Looking good Chris, as always.

When you get back, you need to draw up that frame and ask someone with a CNC to profile it out for ya...;-)

Looking good Griz"thumbsup"
How come you have the Radius Arms on the bottom?
Is that how your Bronco is set up?

Looks great grizz.
4WS like the bronc?

Looks awesome Chris! I enjoy your build ups, they are always top of the line "thumbsup" Cage work looks great and I like the long arms and coil springs. Keep up the good work 8)

-Mike

Wow that is a sweet looking truck and its not even finished! Wish I had your skills. Nice work!

DAYUM Griz.......

badddasss build so far man , i'm going to send you a PM about those coil axle mounts , Love'n the link design too i'm going to keep an eye on this build for sure

This is a sick build and great thinking out of the box on the links!

can you say , ambitious? wow Chris:shock: that is a hellva a build in just a few weeks, i can't wait to see it in person, hell you might win the " long haul and concourse trophies " with one rig.:lol:

awesome work as always, looking forward to it"thumbsup"

I don't like it.

Nice work!

I don't like that either.

Dirk if you don't have anything nice to say then don't say anything at all.You're a jerk Dirk!:x

I don't like that.

I don't like it either.

Now that's funny!!!

Griz,,
That looks killer man. Likin the front suspension set up and the radius arm idea."thumbsup" I have sorta the same coil set up, but, I DEFINATELY liked how you are installing your coil buckets better then mine. VERY NICE.

Man, that thing is NEATO!

Makes me think of corn, Mmmmmmmmmmmmmmmmmmm CORN.

Great thinking on the links too.

Is the body size scale write up going to be in this thread?

Holy hells, I didn't expect this kind of response. :shock: This is more replies than I got in the whole Green Bean thread I think. :lol:
Gotta love the multi-quote feature. "thumbsup"
Thanks, glad you like it L2C. 8)
Thanks clodatall, glad you like it.8) My wife will be glad to see it done as well. :lol:
Thanks Crawler Noob. The rear is a 4 link setup though, the radius arms are on the front. 8)
Hmmmmm, wonner who could do that? You know a good machinist? :flipoff::lol::lol:
What do you mean? On my 1:1 the big tube goes from the frame mount to the top of the axle. From an engineering standpoint I set it up that way so that the short anti-rotation links would be in tension when the axle tries to wrap. Putting your member in tension is always better than in compression, otherwise you could get buckling.
The other reason I did it was cuz it gives more link clearance on the rocks and looked neater that way. :lol:
I have pondered this alot. I really want 4ws but the custom axles that are being made for it will have a straight axle for the rear. At some point I could put two front axles in, and I prolly will, but for now it will be 2ws. Plus I need to figure out where to put a rear servo with my axle truss/link mount in the rear. More on that later. Glad you like it Cole. 8)
Thanks Mike, I try my best. I don't have the machining or styrene skills some of you guys have, but I can weld. :lol: I'm glad you like it so far.
Thanks Knytemare. Practice, practice, practice, I destroyed lots of tube before I got the hang of it. 8)
Thanks pro, glad you like it. PM returned.
Thanks clark, I wanted to do something different than the usual stuff.
Ambitious???? More like stupid. :lol::lol: I can only hope it turns out that nice. 8) Glad you like it Ben, and glad you OK'd it for the scale comp.
Of course not, why would you. :roll: :flipoff::lol::lol:
Thanks Brizio. 8)
Thanks SMF, it took a while to come up with that idea. 8)
Corn? There's no corn here, you posted in the wrong thread again. DJ's binder is one hallway over and a couple doors down. :lol::lol::-P

For the scale size thread I decided to do a build using every body known to man, woman, child, and you. That way there will be no confusion. This is chapter 1. :lol::lol:

Thanks for all the good feedback guys and thanks to DJ and Ace for giving Dirk a nice verbal lashing. :lol:

Oops, forgot this one.
Glad you don't like it, you gotta break a few eggs to make an omelette.
:-P:lol::lol:


More progress to come, gotta get to work now though. "thumbsup"

Copy Cat.:flipoff:
You just can't be part of the heard can you."thumbsup" Looks like I'll have to step it up.

looks great so far"thumbsup" got any pics of your 1:1 bronco?

Admit it, you just got tired of seeing the rest of us break out scale rigs at every comp:lol:

Very nice work on the suspension! I have wanted to do that for a long time but did not have the tools to pull it off.

just wow!

Thanks clodatall, glad you like it.8) My wife will be glad to see it done as well. :lol:

thats CLODSTALL lol i bet she will.mine is always wondering if i will ever get done with one before i start another one.

Never have, never will. Let's see what you got slacker. :flipoff::lol::lol:
I love all your outside the box stuff."thumbsup"
Thanks rednck21. There are a few pics here mines the yellow one.

I am jealous of you guys. I love the scale stuff. "thumbsup"
:lol: Thanks Reefer
Whoops, typo, my bad. :lol: I was told that after this one I HAVE to take a break from building for a while. :lol::lol:

Thanks for the replies guys.

Now, decisions, decisions..Hmmmmmmmmmmm...........
45T lathe, Mag Mayhem, or Revolver 1.:twisted:

Obvious!

Revolver 1