You hit a mesh fence at 300kph, naked. What would happen?

[janno]

Someone could always try it, and let us know what happens...

I bet you wouldn't be letting anyone know anything anymore if you tried it . . .

[90s]

A motorway cop in Belgium showed me an accident scene that made my eyes water. On a long motorway sweeper at high speed a sportbike rider lost it, skidded 20m or so in his leathers, flipped up "star jump" style over a post before coming to rest on a soft grass covered verge. No damage to his body whatsoever because of his gear & leathers.





Oh, except he left his bollox on the post. I think I'd rather go for the wire fence.

[Steam]

or 1333 kgs for those non standard people amoung us.

so yea, in conclusion i think the fence would break.

I don't reckon, that's only a ton and a bit. I reckon the fence would hold, be bowed inwards but I don't think the wires would break.
Hmm...

[Crasherfromwayback]

I'm talking about your normal wire mesh, but this sure would have an effect... High-tensile Welded Razor Wire Mesh!

Someone teach Sue Bradford to ride a bike.....I'll lend her our GSXR1000K7.

[rwh]

I don't reckon, that's only a ton and a bit. I reckon the fence would hold, be bowed inwards but I don't think the wires would break.
Hmm...

I think I agree at a ton and a bit - but I think I disagree with the assumption of half a second to come to rest. The fence wouldn't stretch far enough for that. So either the forces will be greater when the limit of stretch has been reached, or the limit won't be reached because the body has failed to decelerate ... and gone straight through.

I gather a pig is the standard experimental body ... talking about neither of the standard euphemisms here.

Richard

[Steam]

Cool, now, all we need for an experiment is a pig, a sturdy fence, and a Hayabusa.

[sAsLEX]

Someone teach Sue Bradford to ride a bike.....I'll lend her our GSXR1000K7.

I would think a k4 ZX10 with a 1/4 turn throttle would be better......... she aint likely to survive that!

[90s]

Actually some of our engineering friends could work out the forces applying through the mesh of the fence to its fixings, which could be of various types. I think many fences would give at the fastening to the post. The post in soft soil etc (along with a concrete block about the post end) might also be ripped out bringing down the fence.

I was awed by the show of math earlier so no somebody might like to prove me right. (which would be nice ... )

[rwh]

Cool, now, all we need for an experiment is a pig, a sturdy fence, and a Hayabusa.

I was thinking it might be easier if you accelerated the fence as well - say, strung between a couple of V8 utes - but yeah, sturdiness might be a problem. You don't want to end up sanwiching the pig's vehicle between the fence's ones ...

Richard

[ZeroIndex]

Yes it's in bad taste, but really.
Would you be minced into a hundred diamond-shaped bits like a chip-slicer, or just be stuck half in it, or crash straight through it and make a big hole? Or bounce off, or just be crushed like hitting a concrete wall, because maybe the body is too solid to be sliced up like that.

Why is everything with you about ugly rat bikes that wouldn't even see 200kph, or naked people?

[Drunken Monkey]

The Mythbusters team couldn't cut a pig with a steel wire snapping under tension (8 tons on a 5/8 steel cable at one stage). Wires cutting people looks dramatic in films, but is likely to stay within the realms of Hollywood physics. The fence would bend, it would highly likely be a fatal impact, but you won't end up with fence-hole sized chunks in a pile on the other side.
Not sure what the deal is with that Thai story, seen it before as well. I would ideally like to see a genuine report of that 'accident' scene, you can never trust the BS that gets attached with most images distributed on the web.

[Whynot]

Actually some of our engineering friends could work out the forces applying through the mesh of the fence to its fixings, which could be of various types. I think many fences would give at the fastening to the post. The post in soft soil etc (along with a concrete block about the post end) might also be ripped out bringing down the fence.

I was awed by the show of math earlier so no somebody might like to prove me right. (which would be nice ... )

yea, thats more what i was thinking of when i said the fence would break.
either come apart where the mesh attaches or the whole thing come out of the ground.

[Steam]

now if we assume it takes the body around half a second to come to rest(equilibrium) after it hits the fence ....

F=ma
F=m*v/t
F=p/t
F=6667/0.5
F=13.333 kN of force

or 1333 kgs for those non standard people amoung us.

so yea, in conclusion i think the fence would break.

I think your assumption that it will take half a second to come to rest is a little too optimistic. In half a second at 300kph you'd travel over 40 meters. Assuming the fence would flex maybe a meter, you'd come to a stop in about a 40th of a second.
So if we plug 0.025 of a second into your formula, we get a force of 26668 kgs, or 26 tons!!! So yep I reckon the fence would definitely break! 26 tons, that's total mashing.

[bert_is_evil]

Those formula's made my brain bleed - can someone translate this using, say, photoshop?

[Whynot]

I think your assumption that it will take half a second to come to rest is a little too optimistic. In half a second at 300kph you'd travel over 40 meters. Assuming the fence would flex maybe a meter, you'd come to a stop in about a 40th of a second.
So if we plug 0.025 of a second into your formula, we get a force of 26668 kgs, or 26 tons!!! So yep I reckon the fence would definitely break! 26 tons, that's total mashing.

good point

Those formula's made my brain bleed - can someone translate this using, say, photoshop?

sorry i had to use mspaint, i hope its ok ....