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fractoid Regular Location: Perth Registered: September 2004	Re: popup headlights no longer allowed? Tue, 16 November 2004 09:44 FWDboy wrote on Tue, 16 November 2004 17:19 I think that's a little overly simple. The BEST case scenario is rolling over the entire car - chances of that happening are fairly remote though. I think you are failing to take into account the force related to the twisting moment as your head slams into the bonnet! Seeing as the axis of revolution is around about knee or upper thigh height (for an adult) you will find that your head will generally slam extremely fast into the bonnet, and generally at such an angle to cause neck/spinal injuries and with enough force to cause severe enough brain trauma that could result in death. Also I don't think you are taking into account the difference in materials used for the front of a 4WD vehicle and a bull bar. Chances are a bull bar will absorb little or no energy of the impact via deformation or flexing/heat, that is why they are dangerous, the impulse related to the collision is much much shorter than when you hit some plastics and sheet metal. When the impulse gets shorter and shorter, and more energy is being transferred to the pedestrian, you will notice that it hurts a crapload more. Uh-oh, mechanical engineer alert! this is starting to bring back my dynamics lectures... He speaks truth though, if your legs get whacked out from under you at 60, chances are you're going to be spun around fast enough that you'll leave a head-shaped dent in the bonnet. Helmets should be compulsory for all pedestrians. The whole thing with impulses is also important - you know how computer hard drives are rated at some ridiculously high accelerations (100s of Gs)? Well, that acceleration only occurs over the deflection distance of the casing (bugger all, on the order of microns) and so that big impressive number boils down to 'if you drop it from 2 foot, it'll break'. Same thing applies here. A collision with total deflection (your head + bonnet) of 20mm is going to do 1/2 the damage of a collision with total deflection (your head + bullbar) of 10mm. [Report message to a moderator]

	Subject	Poster	Date
	popup headlights no longer allowed?	fractoid	Sun, 14 November 2004 08:03
	Re: popup headlights no longer allowed?	ae86drift	Sun, 14 November 2004 08:15
	Re: popup headlights no longer allowed?	shcao	Sun, 14 November 2004 08:27
	Re: popup headlights no longer allowed?	dimmy77_03	Sun, 14 November 2004 09:00
	Re: popup headlights no longer allowed?	ae86_boy	Sun, 14 November 2004 09:31
	Re: popup headlights no longer allowed?	TRD_Celica	Sun, 14 November 2004 10:02
	Re: popup headlights no longer allowed?	fractoid	Sun, 14 November 2004 10:19
	Re: popup headlights no longer allowed?	RWDboy	Sun, 14 November 2004 10:20
	Re: popup headlights no longer allowed?	ae86drift	Sun, 14 November 2004 10:22
	Re: popup headlights no longer allowed?	RWDboy	Sun, 14 November 2004 10:22
	Re: popup headlights no longer allowed?	bathurst-91	Sun, 14 November 2004 10:23
	Re: popup headlights no longer allowed?	RWDboy	Sun, 14 November 2004 10:26
	Re: popup headlights no longer allowed?	pr1nce	Sun, 14 November 2004 10:27
	Re: popup headlights no longer allowed?	ZZT231	Sun, 14 November 2004 10:36
	Re: popup headlights no longer allowed?	RWDboy	Sun, 14 November 2004 10:42
	Re: popup headlights no longer allowed?	Arch	Sun, 14 November 2004 11:16
	Re: popup headlights no longer allowed?	Hawk	Sun, 14 November 2004 22:37
	Re: popup headlights no longer allowed?	MR 1JZ	Sun, 14 November 2004 22:40
	Re: popup headlights no longer allowed?	Jag7799	Sun, 14 November 2004 22:46
	Re: popup headlights no longer allowed?	draven	Sun, 14 November 2004 22:52
	Re: popup headlights no longer allowed?	Evil_Foetus	Mon, 15 November 2004 12:03
	Re: popup headlights no longer allowed?	RWDboy	Mon, 15 November 2004 01:47
	Re: popup headlights no longer allowed?	fractoid	Mon, 15 November 2004 01:54
	Re: popup headlights no longer allowed?	RAV-GT4	Mon, 15 November 2004 03:18
	Re: popup headlights no longer allowed?	Jag7799	Mon, 15 November 2004 03:19
	Re: popup headlights no longer allowed?	fractoid	Mon, 15 November 2004 03:53
	Re: popup headlights no longer allowed?	shaneblack	Tue, 16 November 2004 07:39
	Re: popup headlights no longer allowed?	toof	Mon, 15 November 2004 06:03
	Re: popup headlights no longer allowed?	RobST162	Mon, 15 November 2004 07:26
	Re: popup headlights no longer allowed?	jackel	Mon, 15 November 2004 07:59
	Re: popup headlights no longer allowed?	justcallmefrank	Mon, 15 November 2004 08:02
	Re: popup headlights no longer allowed?	RobST162	Mon, 15 November 2004 08:02
	Re: popup headlights no longer allowed?	EnFlaMEd	Mon, 15 November 2004 08:14
	Re: popup headlights no longer allowed?	Hawk	Mon, 15 November 2004 08:23
	Re: popup headlights no longer allowed?	Jag7799	Mon, 15 November 2004 09:20
	Re: popup headlights no longer allowed?	RobST162	Mon, 15 November 2004 09:25
	Re: popup headlights no longer allowed?	justcallmefrank	Mon, 15 November 2004 10:36
	Re: popup headlights no longer allowed?	Jag7799	Mon, 15 November 2004 11:11
	Re: popup headlights no longer allowed?	justcallmefrank	Mon, 15 November 2004 11:47
	Re: popup headlights no longer allowed?	CrUZsida	Tue, 16 November 2004 00:37
	Re: popup headlights no longer allowed?	Jag7799	Mon, 15 November 2004 11:13
	Re: popup headlights no longer allowed?	thechuckster	Mon, 15 November 2004 11:21
	Re: popup headlights no longer allowed?	RWDboy	Mon, 15 November 2004 12:35
	Re: popup headlights no longer allowed?	CrUZsida	Tue, 16 November 2004 00:39
	Re: popup headlights no longer allowed?	Jag7799	Tue, 16 November 2004 00:42
	Re: popup headlights no longer allowed?	fractoid	Tue, 16 November 2004 01:12
	Re: popup headlights no longer allowed?	RWDboy	Tue, 16 November 2004 09:19
	Re: popup headlights no longer allowed?	fractoid	Tue, 16 November 2004 09:44
	Re: popup headlights no longer allowed?	RWDboy	Tue, 16 November 2004 13:59
	Re: popup headlights no longer allowed?	shaneblack	Wed, 17 November 2004 06:34
	Re: popup headlights no longer allowed?	fractoid	Wed, 17 November 2004 07:01
	Re: popup headlights no longer allowed?	RWDboy	Wed, 17 November 2004 07:13
	Re: popup headlights no longer allowed?	shaneblack	Thu, 18 November 2004 06:33
	Re: popup headlights no longer allowed?	b1gb3n	Thu, 18 November 2004 12:27
	Re: popup headlights no longer allowed?	RWDboy	Thu, 18 November 2004 16:18
	Re: popup headlights no longer allowed?	b1gb3n	Thu, 18 November 2004 17:47
	Re: popup headlights no longer allowed?	Toobs	Thu, 18 November 2004 22:15
	Re: popup headlights no longer allowed?	Hawk	Thu, 18 November 2004 22:54
	Re: popup headlights no longer allowed?	b1gb3n	Fri, 19 November 2004 06:30
	Re: popup headlights no longer allowed?	alliance_22	Thu, 18 November 2004 23:23
	Re: popup headlights no longer allowed?	alliance_22	Thu, 18 November 2004 23:27
	Re: popup headlights no longer allowed?	Toobs	Fri, 19 November 2004 00:30
	Re: popup headlights no longer allowed?	RWDboy	Fri, 19 November 2004 01:16
	Re: popup headlights no longer allowed?	fractoid	Fri, 19 November 2004 03:44

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