RCCrawler Forums - The short bus

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- - The short bus (http://www.rccrawler.com/forum/rcc-speed-shootout/211850-short-bus.html)

I happened to stumble on this contest sunday night while in a search. Started looking around to see what I had to do a build. I decided to do a crawler class build since I had a ax10 roller sitting here. I've been working on it all this week but have been unable to get my pics up. I will have them all up tomorrow. So here's what has been going on this week.
I grabbed the roller, an old chassis I made acouple years ago, and pulled the brushless system out of my sandrail. I had some revo push rods and some hr air shocks in a box from a previous build. Ended up staying up til 3am getting a roller built.
I grabbed 2 sets of rear jato tires from work the next day. I hooked up the vxl motor and my sidewinder to the axial tranny. Ended up pulling out one of my 3s plane lipos and tested it out. I was not impressed by the bench test. It wouldn't even ballon the tires. I knew I had to find a way to get out some of the gear reduction. I started digging around into my parts and found an old rustler tranny in pieces. After looking at it and pondering for awhile I got a idea. It just so happened that 2 of the case bolt holes lined up with the motor. Perfect enough that I could run a 22t pinion gear off the motor directing into the tranny in place of the 22t top gear. In thery this should turn the outputs at least 2 1/2 times faster. After getting it all mounted to the skid I hooked it up and what a difference!

So I was happier with the wheel speed now. I then decided on ride height and pulled the shocks off to limit them down to fit.
While at work on Tuesday I picked up a 3s 4000mah lipo for it and was debating on running a body. I went over and started to look what was on the shelf (working at a hobby shop is nice but trouble). I knew I had to run one when came across the skool bus from parma. I set it over the rig and i knew it was the one to run. Reminded me of the drag bus I saw at hot august nights in reno. After getting it all trimmed and painted, I decided it needed something, a big blower sticking out the hood! Found one I had from the hpi bronco body but wasn't happy with it. So I pulled out one of my muscle machine models and stole the blower. I also dug out some wheel wideners to get the tires out far enough so I wouldn't have to hack the body up.
I finally got everything installed enough to try some test runs. Decided to run it without the body just to be safe( chassis was enough to protect everything) and good thing did. First run up the street end with it cartwheeling. Ended up bending both rear axles pretty bad. It just didn't seem to handle well at all. My buddy suggested adding some weight down low on the chassis so i strapped an old nice pack to each side of the chassis. Night an day difference. So after dialing the steering down some we grabbed the gps and ran up the
street to sparking lot with some room. Made a few small passes to make sure everything was good and the gps was working. All was good so I made a few good passes and checked the gps. 39.81 mph. Not bad for a crawler but I still want more. Going to through In a 9t brushed and see how that does tomorrow. If that doesn't improve my speed I will look around for a higher kv brushless motor.
I'll add all my pics when I get to work later. I have to say this has been one of the funnest builds I've done in awhile! Thanks killa for coming up with this one "thumbsup"

Heres acouple pics. waiting for my buddy to send me the rest.
This is what I started with
http://i301.photobucket.com/albums/n...g?t=1258750314

the short bus
http://i301.photobucket.com/albums/n...g?t=1258750414
http://i301.photobucket.com/albums/n...g?t=1258750556

Thats bad ass man! Love it! "thumbsup"

ha mow that is what i'm talking about

those front axle extensions look scary. in post #3 you can actually see them saging causeing camber :shock:
maybe the nuts werent tight or something.

Quote:

Originally Posted by STANG KILLA SS (Post 2116632)

those front axle extensions look scary. in post #3 you can actually see them saging causeing camber :shock:
maybe the nuts werent tight or something.

Its just alittle play:mrgreen:. There not the greatest wideners but they were the only ones that would get the wheels out away from the body enough. I didn't want to hack up the front end of the body. It suprisingly still handles decent.

should make for some intresting high speed runs!

I was talking with a co-worker about doing something along those lines, only using the Pede/Rusty rear rims so it looks tubbed and have some kind of TC front end on it.

Kinda like this"thumbsup"
http://www.youtube.com/watch?v=_-Df_hnZIIQ
http://www.youtube.com/watch?v=gwZu-EGIacA&NR=1

here's the roller. The stick packs on the side were just added for weight. The 3s lipo is what powers it.
http://i301.photobucket.com/albums/n...1258788719.jpg
http://i301.photobucket.com/albums/n...1258788735.jpg
http://i301.photobucket.com/albums/n...1258788747.jpg

Just made a run for video. 46.07mph. The run ended with the rear axle housing breaking off at the rc4wd lockouts so no more runs tonight. Glad we taped the first run! Gonna get the vid up later. I'll get a new housing on tomorrow a try to get it faster. Possibly might be getting a higher kv motor to try to.:mrgreen: