So how effective is the SD Roll Cage? - Page 2 - Defender Source
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  #21  
Old July 29th, 2015, 12:47 AM
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Oh man, that fiberglass top is ruined.

;-)
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  #22  
Old July 29th, 2015, 06:33 AM
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Raub, was the A hoop off prior to the crunch?
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  #23  
Old July 29th, 2015, 07:29 AM
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Originally Posted by rovertrader View Post
Raub, was the A hoop off prior to the crunch?
Looks like it was internal not external. Strange
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  #24  
Old July 29th, 2015, 07:32 AM
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The Tithonus is like the NAS90, internal from B rearward, but external A to B. Wondered if that A hoop was installed prior to the flop, as it is secured differently than a NAS A hoop.

Almost looks like that Wolf had an internal A to B??
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  #25  
Old July 29th, 2015, 07:56 AM
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Originally Posted by Rocky View Post
Looks like it was internal not external. Strange
Yeah X2
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  #26  
Old July 29th, 2015, 07:58 AM
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We're on the same page there Dale.

Notice to that the cab is soft top, while the load area is HT. All very interesting.
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I don't know about the brakes, only their unreliability.
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  #27  
Old July 29th, 2015, 08:01 AM
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Quote:
Originally Posted by Rocky View Post
We're on the same page there Dale. Notice to that the cab is soft top, while the load area is HT. All very interesting.
That's looks like the headliner insulation material for the fiberglass top. There was one for sale here recently.

Found it.

http://www.defendersource.com/forum/...kit-63487.html
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  #28  
Old July 29th, 2015, 11:42 AM
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  #29  
Old July 29th, 2015, 11:58 AM
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Quote:
Originally Posted by ontheway View Post
Brian (brewie) did mine - fully welded front to rear...
Your roll cage is solid.

I remember the URE trip where it hit the wall on that steep incline.
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  #30  
Old July 29th, 2015, 11:59 AM
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The WOLF cage is fully internal. The cages were a retrofit on Tithonus 110's. Hence the Tithonus cages being a little different.
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  #31  
Old July 29th, 2015, 01:18 PM
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I'm curious about liability...
For those of you who have fabricated safety cages.
This might apply to brewie but also to anyone who has made up a cage.
Did you have any engineering studies done?
What about culpability?

If somebody rolls their truck and their family is killed or paralyzed and your cage was 'sposed to protect them....who's at fault?

I'm sure SD has a contingency plan.



.
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  #32  
Old July 29th, 2015, 02:19 PM
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Liability is funny with cages, you cannot guarantee that you will save someone's life given unforeseen circumstances, all you can do is prepare for the worse... What I have to do is follow DOT guide lines on acceptable material, thickness and integrity of designs(solid one pc main hoops tied to chassis outriggers) you even have to take into consideration material thickness on bends(the wall thickness expands and shrinks). Roll cages that are completely welded are a lot stiffer and stronger then bolt together cages. SD cages do not meet NC DOT specifications to be called a safety cage, which really doesn't mean much. Material thickness from what I have seen on them is .095 which on the bends if even thinner, in NC the minimum is .120 at the thinnest portion. The entire integrity of the cage is left to its weakest link, the pure shear strength of the bolts holding it together. With this all being said, a P&P cage or SD cage are not the strongest out there in my opinion but they do give more structural integrity then not having one at all. Like Will said you pay for it once and it only has to do its job once to justify the expense. To answer your question about liability it is based off of mechanical function rather then circumstance. Someone may die but if the cage performed the way it should then no fault. But if a malfunction, improper installation or some other variable pertaining to actual function then that is where I am liable...
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  #33  
Old July 29th, 2015, 03:24 PM
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Quote:
Roll cages that are completely welded are a lot stiffer and stronger then bolt together cages
For the most part, I agree, but this statement is untrue.

Jebus. These are engineered structures. Welds are not magic, and bolted cages can have significantly higher strength than any welded structure. If you have two 1/2" 180ksi bolts at a junction of a cage, the shear strength is almost 8x higher than .125" wall DOM tube fastened with a weld.

From an engineering perspective, welds are essentially fasteners - just like bolts.

I find it bothersome that the statement "fully welded" is being used as if to say "better than bolted together". It doesn't mean that at all. Look on google images and you will see countless examples of failed cages that are fully welded but poorly engineered.

I also find it a little odd that we're discussing this as if roll cages were something that were invented in the 90's purely for NAS Defenders, and that somehow the huge body of knowledge that already exists in building cages for motorsports doesn't exist. Assuming that the welds are executed correctly and the correct fasteners are used, cage failures are almost always in the weakest parts of the cage: the long, untriangulated tubular sections.
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  #34  
Old July 29th, 2015, 03:28 PM
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A good (properly worn) helmet is just as important when on a motorcycle.
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  #35  
Old July 29th, 2015, 03:32 PM
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Originally Posted by rijosho View Post
A good (properly worn) helmet is just as important when on a motorcycle.

Wait... is that's Dave's KLR?
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  #36  
Old July 29th, 2015, 03:45 PM
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Originally Posted by JSBriggs View Post
So the 130 cage with the sleeved macoroni and cantilevered plate outriggers wouldn't qualify? It looks like this one is sleeved externaly rather than gusseted as well. Whats the story with this one? -Jeff
Let's be clear, I am not saying my cages are better or stronger... As for your snarky comment regarding Shaynes truck, it wasn't designed for roll over strength but as for a giant brush bar bC that was what the customer wanted... As for the external braces on David's blue 110, I over built it. All those support bars are welded straight to the hoops and then the extra pc was slid over and welded again.
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  #37  
Old July 29th, 2015, 03:55 PM
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Originally Posted by JSBriggs View Post
I guess i don't understand the purpose of the 'support bars' on the Blue truck. -Jeff
I guess with custom built cages you don't have to as long as the customer gets what they want.
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  #38  
Old July 29th, 2015, 03:57 PM
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Originally Posted by JSBriggs View Post
I see Dale and Goose, but who is the 3rd wheel?

-Jeff
Barry
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  #39  
Old July 29th, 2015, 04:01 PM
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Originally Posted by rijosho View Post
Barry
It was secret.
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  #40  
Old July 29th, 2015, 04:02 PM
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Originally Posted by rijosho View Post
A good (properly worn) helmet is just as important when on a motorcycle.
Goose sure looks good in blue ;-)
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