#8 at Hallett claims another throttle-lifter v.mustangcarnage
10-27-2009, 10:32 AM
#22
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There used to be a billboard frame off in the distance one could use as a marker when going CCW through #8. Is it still there?
BTW, I doubt with a hard dog style bolt-in setup that it would punch through the floor of a Miata like that. On the Mustang, it looks like it is just a regular large expanse of floor pan that the hoop is attached to, judging by the upside down picture. On the Miata, it is at the intersection of the vertical section of body right behind the seats, and the horizontal pan that forms the trunk undertray. If you have installed a Hard Dog you know what I mean. That should result in a very strong structure, especially since the vertical section would be loaded in-plane (mostly), and not out-of-plane (like the Mustang floor). Plus, the Miata is much lighter of course.
Glad the driver and passenger made it out OK. It is amazing they were not hurt. The roof crushing and the tearing out of the roll bar must have absorbed a tremendous amount of the energy.
BTW, I doubt with a hard dog style bolt-in setup that it would punch through the floor of a Miata like that. On the Mustang, it looks like it is just a regular large expanse of floor pan that the hoop is attached to, judging by the upside down picture. On the Miata, it is at the intersection of the vertical section of body right behind the seats, and the horizontal pan that forms the trunk undertray. If you have installed a Hard Dog you know what I mean. That should result in a very strong structure, especially since the vertical section would be loaded in-plane (mostly), and not out-of-plane (like the Mustang floor). Plus, the Miata is much lighter of course.
Glad the driver and passenger made it out OK. It is amazing they were not hurt. The roof crushing and the tearing out of the roll bar must have absorbed a tremendous amount of the energy.
Last edited by ZX-Tex; 10-27-2009 at 10:43 AM.
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10-27-2009, 12:56 PM
#27
The force of swinging a 3400lb vehicle about it's nose is much more than you could possibly design a standalone bar place 10ft out from the axis of rotation to withstand. At that point you should be considering a full cage to spread some of that impact force.
On the fence: I don't think it played much of a roll in flipping the car...they were already digging in for a pole-vault maneuver.
Good to know those guys are ok...can't believe it...but happy nonetheless.
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10-27-2009, 01:21 PM
#28
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Like I alluded to, the roll bar clearly should have had larger base plates (doublers) to distribute the force over a larger floor pan area and/or been tied into the frame (unibody) rails. No reason why it should have failed just because it was a 'flip' and not a 'roll'. Rolls can get pretty violent as well. But I agree a full cage would be even better. The load would have been distributed over twice as much area, all else being equal.
I think the fence/tire wall induced the airborne-ness that created the nose down orientation resulting in the nose plant.
I think the fence/tire wall induced the airborne-ness that created the nose down orientation resulting in the nose plant.
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