I just saw this on another board, the conversation was about hitting your head on the rollcage while getting in the rig, is this design stucturally safe???

Getting in it looks like you not going to hit you head, but while your sitting in the truck, it looks like you now have a bar right over the top of your head, so one bump and you are more then likley to hit it

I say just learn to duck. A cage is not about comfort it's about safety.

Hooder do you know what software that was done with?


Tell me if I'm wrong but wouldn't a hard crush in the direction of the yellow arrow bend the tube circled in red and pull the front hoop back collapsing the cage on the driver?
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I would hate to have that huge gap between the front and back hoops.......just imagine how much it would suck to be sliding the top of your cage against a rock and then get the rock wedged between the two. I would rather have the outer bar so it would help slide off the rocks.

I'm not liking the design of those upper tubes, they leave too much up to the sideways strength of the tubing instead of using triangulation to mimimize the stress.
probably just as good as having two straight bars on each side but not as good as a cross in the middle.

Originally posted by syko
Tell me if I'm wrong but wouldn't a hard crush in the direction of the yellow arrow bend the tube circled in red and pull the front hoop back collapsing the cage on the driver?
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The more I look at it, I don't know.........I guess it would work? The forward crush would have to pull the rear mount to bend that bar. I guess I'm full of $hit

Originally posted by HighHooder
I just saw this on another board, the conversation was about hitting your head on the rollcage while getting in the rig, is this design stucturally safe???

If you have the room, why not just make the hoops an inch or two taller? Would also help save the windshield frame.

Other than that buy some pipe insulation from home depot, or learn to duck.

The small bars are frigin stupid!!! Look at the difference of forces from where they are to running the bar from the front hoop edge to the back like you normally see them.. In fact, thats a weaker setup if you want my opinion, you are pushing forces in the center of that bar where the only stability is the ends, where if it was from hoop to hoop, it would have to pull on the triangulated upper spreader if it was a frontal hit... I just see that being stupid!!!!

I guess if you really wanted the head room maybe add two more bars

Originally posted by syko
I guess if you really wanted the head room maybe add two more bars
Then that would give the kids something to play on.:D

Syco,

yes, in your original yellow and red drawing, and impact such as you describe WOULD want to bend the bar at that intercetion.... depending on the force of the impact and the strength of the tube of course. It would need to pull the front and rear bars in... but then that the point... an impact at the yellow *could* collapes the cage on the occupants.

The addition of your green tubes would all but eliminate that.

Over all, with the green tubes it doesn't look *too* bad..... but yes the side tubes would be nice for sliding or leaning up against something.

I don't claim to have the experience or know how that you guys do, but I think that forces in the direction of the yellow arrow would be difficult to achieve, and if that situation did occur, I don't think the forces would be significant. You'd have to be falling backwards into something and just catching that lip. A rollover front to back may hit it somewhat, but I don't think it'd be a sustained force.

I agree that the addition of the green ones would help, but I'm wondering how much of an issue that would really be.

Bryan

In the Mid-west and other tree thick areas...
That cage would grab ahold of MANY trees and have you stuck as if you were strapped to them.
Or, force you to tear the crap out of the tree and earth to get by a relativly easy slider.

Just another view...

Cory

Originally posted by Lord Baskerville
In the Mid-west and other tree thick areas...
That cage would grab ahold of MANY trees and have you stuck as if you were strapped to them.
Or, force you to tear the crap out of the tree and earth to get by a relativly easy slider.

Just another view...

Cory

I've seen this happen and it was a pain in the A$$. Just my .02

NOw I don't have a little Red star so I can't modify that picture... I sure do need to get one..... But if the bar that is angled from the very back of the vehicle is mounted Higher and closer to where the yellow arrow points wouldn't that help solve some of that problem...... .just another thought

you know, looking at it closer, all the upper tubes have a "kick" in them.... ANY decent front/side impact would cause those tubes to continue bending, causing the front outside bars to fold inward.

Less than if there was no bar in there at all, but more than a strait bar....


beter to just learn to duck.

:rainbow:

After building a few roll cages I have a few thoughts on the design here. In rock crawling I really wouldn't worry too much about collapsing the structure around the driver since the impacts are not all the large, but I would really worry about rolling sideways and having a big rock going into the passenger compartment. Most racing cage specifications require side impact bars, not because the provide a lot of crush protections, but because they take the majority of the impact instead of your head. Just my $.02

Originally posted by syko
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Hooder do you know what software that was done with?


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Form Z (http://www.formz.com/)

Originally posted by weldpro
:rainbow:



YUP!