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Thought yall might like to know that Racefab in Rusk Texas has their roll cages on sale right now for $2,200 installed this one they put in a C4 looks pretty sweet!
That would depend on the way the load during impact was applied. They build sports racers that have a single bend hoop over the driver much like in open wheel racing. Here they have just created the same into a full width roll bar giving the driver more protection as I see it. Like two hoops in one.
That would depend on the way the load during impact was applied. They build sports racers that have a single bend hoop over the driver much like in open wheel racing. Here they have just created the same into a full width roll bar giving the driver more protection as I see it. Like two hoops in one.
If the "second hoop" diagonal continued (more or less) straight down past the harness bar, I'd be inclined to agree that there's more protection since it would be channeling the forces in compression along the axis of the tubing . As it is, the diagonal's load will hit the harness bar with a bending force and not much in the way of support below it since the second half of the diagonal goes off at a pretty steep lateral angle.
BTW, is this your cage or just a pic you ran across on their FB page? I wonder if this design would make it past SCCA/NASA tech?
If the "second hoop" diagonal continued (more or less) straight down past the harness bar, I'd be inclined to agree that there's more protection since it would be channeling the forces in compression along the axis of the tubing . As it is, the diagonal's load will hit the harness bar with a bending force and not much in the way of support below it since the second half of the diagonal goes off at a pretty steep lateral angle.
BTW, is this your cage or just a pic you ran across on their FB page? I wonder if this design would make it past SCCA/NASA tech?
Christian
I agree that the 'diagonal' bar would not do anything, as it is not connected to the nodes, so it serves no purpose in distributing load across the cage. This would be one of the reasons why the roll cage would not pass the NASA tech (and probably SCCA tech), as they require a diagonal bar to be connected to the main hoop on both sides.
The door bars are also not very functional, as they don't connect the hoops. Would they help in case you get hit from the side... probably, but won't be as effective. At least they are anchored to the frame.
I am not a structural engineer, but recently did have a cage done and learned a lot about what is required and what works. And this one does not follow the right recipe, sorry to have to say that.
The S hoop and the door bars compromise this cage quite a bit, not sure why a cage builder would do this unless the client requested it. More work and not as structurally sound.
Looks like stock seats in there which makes me think this cage is for a street car. Nobody would go this far and keep the stock seats in a racecar.
That 'diagonal' is spooky For NASA SCCA it's supposed to be one piece and straight, with the harness bar split to intercept it. It's for good reason, as that bar is supposed to give the cage much of its strength through triangulation of the main hoop.
Looking at the engineering/layout, I'm guessing that's why the price is so cheap...you get what you pay for.
Not a chance in hell I would trust that with my life in a roll-over. There's a 50/50 chance it will fail...and probably the ratio is worse than that, but I'm not a structural engineer.
04-14-2015, 09:51 PM
custom rollcage
For NASA SCCA it's supposed to be one piece and straight, with the harness bar split to intercept it. It's for good reason, as that bar is supposed to give the cage much of its strength through triangulation of the main hoop.
