Roll cage

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FoMoCo01

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Hey guys, currently in the middle of building a cage, thought I'd post some pics! Enjoy! Also, a few extras

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FoMoCo01

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IMG_2981_zpshcf4luhv.jpg
 
99COBRA2881

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Ok you posted so that opens up the thread to questions

Why bring the rear main hoop diagonal braces to the mostly unsupported middle of the main hoop, instead of tying them in out towards the b pillar where they would butt up against the supported node?

Door bars not extending out into the door cavity, keeping the windows functional?

What rule set are you using to build your cage to?
 
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FoMoCo01

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  • Thanks for the reply. To answer the diagonal bar question, it was really just preference and ease of welding. I follow a lot of rally racing and I've seen this design on some cars and really liked it. Also, the front roof bars will connect in the center where the rear diagonals meet and run to the front windshield bar on either side. Also, I will be adding A pillar support bars running from the driver side near the mounting plate up to the windshield and overhead bars.
  • I won't be using factory windows, but haven't decided whether or not to cut out the inner door frame at this time. These cars have an extremely rigid inner door bar from the factory that I wanted to leave in place. I may look into running Pikes Peak at some point in the future and if I do, I'll fabricate some carbon doors and build a nascar style door bar outside of the existing door bars on the driver side along with a petty bar.
  • I'm building the cage to Pikes peak and NASA rule books.
  • Also in progress of building my seat mounts
  • 15781370_1482560981771439_4589065649084552697_n_zpsxzatfyds.jpg
  • 13015623_1246242192069987_8225137967534288260_n_zps3mxeigzc.jpg
 
99COBRA2881

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Where are the base plates under your main hoop you can't just put those to the stock sheet metal that will never pass NASA tech. That area is easily boxed.

Per NASA rules the cage also has to have a horizontal bar the X by itself might get scrutinized. Probably just not welded in yet but I want to make sure it's right.

I'm not trying to be an overly critical a$$ just trying to save you the headache of building an illegal cage.
 
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FoMoCo01

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Always open to suggestions. The cage currently isn't welded to the body yet. Need to get a suspension under the car and get the car sitting with all weight on the suspension mounting points before I feel comfortable welding it to the car. i built the main hoop on the rear seat support so that I could slide the cage forward and down to weld the rear bars. The mounting plates aren't in yet because I need to tack in the rear bars before I put it into place for final welding. I'm not sure what you mean about the door bars. NASA requires a minimum of 2 bars on the Driver side and 1 for the passenger side (my pass side will be identical to drivers). I didn't do a traditional X because I didn't want to do the same thing as everyone else. I got the idea for my door bars from several IMSA GTE cars that run a similar setup. If it's good enough for those cars I can't see why it wouldn't be good enough for NASA.
 
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FoMoCo01

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Were you talking about a horizontal bar in the main hoop? If that's the case, there will be. Currently working on a lower seat mount and once I get the seat bolted in, I can add a horizontal bar for a seat back mount. Need to know where the seat back mount will locate before I can notch the rear bars.
 
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Ironmancuck

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When I saw that unsupported middle section, this came to mind: "T junctions are called a dead tube junction, as one tube dead ends into another. This should be avoided whenever possible, because the dead end tube will bend the other one when the loads are along the dead tube." Roll cage design is not a thing to fool around with if you don't know what you are doing.

Here is a cage with out an FIA front brace that failed in a crash
IMG_1415.jpg
 
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FoMoCo01

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Ironmancanada said:
When I saw that unsupported middle section, this came to mind: "T junctions are called a dead tube junction, as one tube dead ends into another. This should be avoided whenever possible, because the dead end tube will bend the other one when the loads are along the dead tube." Roll cage design is not a thing to fool around with if you don't know what you are doing.

Here is a cage with out an FIA front brace that failed in a crash
IMG_1415.jpg
Click to expand...

Interesting...so is this cage wrong as well? Goodwood festival of speed winner and time attack car built by the Ollie Clark.
http://www.speedhunters.com/2013/09/gobstopper-2-ultimate-impreza/


I agree with your statement. Dead end t joints are extremely unsafe, but there won't be any once the cage is done (which it's not yet). Look through my post before you post comments like this. Exactly why I stopped posting on this forum before...
 
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iismet

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Don't get upset. While the whole "your going to kill yourself is a distraction" the point of the node is important. The car you posted is dead ended into a node from both sides. Look at the tubes approaching the joint from the A pillar. I tried to mark them in red. You can easily adapt this to your design if you have not already.

One will always get called out for dead ending into space.

chr

iNSmsr.png
 
MFE

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You posted a cage thread, in-progress, and you're getting butthurt about people making solid technical suggestions. I don't know, but it's starting to sound like what you were really looking for was "cool cage, bro". There's facebook forums out the ass for that stuff.
 
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FoMoCo01

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Not butt hurt man
Solid technical suggestions and creative input are welcome. However, I don't need input from someone looking to call someone out for instant gratification on something that's clearly already there. If I was looking for "bro nice cage" I would've bought a bolt in roll bar and steedas whole catalog and entered the next car show.
 
WutApex

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I'm a bit late to the thread, but have you chatted with Hank (Hanksville Hotrods)? He's the NASA Rocky Mtn region Safety/Tech Chief if you have any questions.
 

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