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Rock Crawlers For those Rock crawling, stone sliding, body scratching, articulation crackheads; this place is for you!


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  #1  
Old 01-15-2007, 03:43 PM
little grey little grey is offline
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Default A different kind of torsion.

I have never really like torsion chassis', as they all look like any 5 yr old with a hacksaw can make, but after seeing how they performed, I started to change my mind a little. After talking with a good friend, who happens to have access to a laser cutter, I decided to take the plunge and try out an idea I have never really seen doen before. I bring you, "The Sled". (this is V1 of 3 of the design)







It utiizes a sway bar type supension. All the articulation comes from the sway bars, not chassis flex. They are just made out of some 3/32 piano wire that I bent to the right shape. It provides just enough give, while still maintaining torsion like feel. The ground clearance is somewhere around 2.5-3", I never really measured it. The WB is a comp legal 12.5" and articulation is about 3", but it will probably soften up over time. The rig is pretty light at around 4lb's fully loaded. Body posts will be added somewhere; I just don’t know where yet. I was also thinking of some custom 2/3a packs to go on the top of the axle. 2 3-cell packs, one on each side of the servo, but its works pretty good now. These are some old pictures. Now, there is front dig, and a pretty cool skidplate. It has small tabs the sit against the battom of the chassis, so there is no metal hitting the rocks, just slick cutting board. I've driven it a few times, and found a few bugs that needed to be worked out, but so far it has worked pretty well. I know the NERCC guys are jealous of what it can do. So, what do you think? You can go here for the entire buildup and more info as well as updated pictures. Version 3.0 is in the works. Hopefully it will make the chassis easier to adjust. Any questions, just ask. It's still in the rough stage, so be nice.

BTW: Here are some videos of it in action.
http://www.nercc.net/member/media/The_Sled.wmv
http://www.nercc.net/member/media/Sled_V2.wmv
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  #2  
Old 01-15-2007, 04:15 PM
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Rctrucktrialer Rctrucktrialer is offline
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Wow, ok, this is what I love to see, people taking ideas, running with them, and making them their own. Great stuff, I'm downloading the video now and will let you know what I think of it.

It's great to see people put effort into things like this, and I'm pretty sure you could start selling those if you have permanent access to that laser cutter.

Great stuff, Keep it up.
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Old 01-15-2007, 04:26 PM
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wow, a 80* 12ft wall, that was completely insane.

What's the RRP on these chassis ? and what's included.
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Old 01-15-2007, 04:59 PM
TLTcrawler06 TLTcrawler06 is offline
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Hate to break the news to ya, but the BMVII is basicly the same thing..and has been out for quite a while now. But I really like that, it looks great! nice job.
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Old 01-15-2007, 05:03 PM
little grey little grey is offline
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IMHO, the BMV2 is similar, but not the same thing. Yes it uses piano wire to create a torsion effect, but there is no real chassis to it.

I have been thinking about selling them I was thinking about 75 for a preassembled chassis with a skid, links, and the sway bars. I dont know yet though.
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Old 01-15-2007, 06:46 PM
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Sounds reasonable.

And even if it was the same as the BMVII, think about how many chassis there are that are basically the same, and how many of them differ in performance greatly.

I like it, and I'd love to order one, I just need to get my hands on some TLT axles, then I'll drop you a line.
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Old 01-15-2007, 09:57 PM
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The way it works isn't even remotely the same. The BMVII has 2 rods and those rods bend. This setup works the way a swaybar does with the middle sections twisting, unless the sides of the swaybars bend. Do the sides bend? As long as the sides don't bent then bending and twisting are completely different. Both ideas took a lot of thought and intelligence to come up with.
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Old 01-15-2007, 10:16 PM
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Originally Posted by TLTcrawler06 View Post
Hate to break the news to ya, but the BMVII is basicly the same thing..and has been out for quite a while now. But I really like that, it looks great! nice job.

Hate to break the news to ya, but its nothing alike!
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Old 01-15-2007, 10:26 PM
little grey little grey is offline
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Thanks guys. I think people think they are alike is because they both use the bending steel idea, just in different ways.
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Old 01-16-2007, 12:23 PM
TLTcrawler06 TLTcrawler06 is offline
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Hate to break the news to ya, but its nothing alike!
Nothing alike? little grey's chassis has a plate that the tranny mounts to. They're VERY similar IMO, I don't care what anyone says.

little grey, I'm not raggin on your chassis, I think it's REALLY awesome and I love to see new things, but I just think the BMVII and the "sled" are very similar, just trying to make a point.
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Old 01-16-2007, 12:54 PM
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Just love it when someone comes up with new ideas like this one.

Nice work, impressive vid and congrats with a awesome rig
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  #12  
Old 01-17-2007, 09:48 AM
little grey little grey is offline
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Well, thats your opinion.
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Old 01-17-2007, 09:58 AM
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my opinion is that you should probably send me one for some outside testing. thanks.
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Old 01-29-2007, 09:47 PM
little grey little grey is offline
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Here's a small update for ya, V3 of "The Sled":

I got this picture from the guy who cut it. I haven't personally recieved it yet though. Expect built pictures by this weekend.
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Old 01-30-2007, 03:35 PM
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I finally did some more work. The dig was buttoned up, and is almost complete. Once the truck is back together, I will make some adjustments to make it as smooth as possible. Pics will be up soon. Next I have to drill and tap some locking collars.

To be continued...

EDIT:
Continued...

Pics as promised.



Last edited by little grey : 01-30-2007 at 07:02 PM.
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