5 ms·

A crumple material that will crumple in a car vs pedestrian collision? Like NERF foam or something?

freeqaz 4y ago
This comment actually got a laugh out of me. I truly have no idea what would be feasible in a collision like this. Probably packing peanuts? Airbags on the outside of the car that deploy when a pedestrian is detected?
- wintermutesGhst 4y ago
  Pedestrian airbags have been designed before, but don't seem to have caught on widely [1]. A more bizarre solution Google patented always stuck with me: A sticky car hood beneath an eggshell coating so that a struck pedestrian would stay on top of the car instead of falling and hitting their head or being run over [2]. 1: https://www.youtube.com/watch?v=CiiBlirAG8w https://www.youtube.com/watch?v=CiiBlirAG8w 2: https://www.popularmechanics.com/technology/a20953/google-patent-sticky-car-hood/ https://www.popularmechanics.com/technology/a20953/google-pa...
- ordu 4y ago
  Such airbags would throw a pedestrian away. A long way.
- User23 4y ago
  There are wearable airbags on the market for motorcycle use. I don't know how effective they are for their intended use or how effective they might be protecting a pedestrian, but it's a technology that exists.
homonculus1 4y ago
It's a far cry from Nerf, with fiberglass on top of it, but styrofoam is actually used inside bumpers
bch 4y ago
I recall one manufacturer popped the hood so that it could act as a shock absorber should a pedestrian land on it... Found it - Nissan has an actuator[0] that lets the cars hood be used as a damper for unlucky pedestrians in case of collision. [0] https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHIVE/PUEHFPP/ https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHI...
boppo1 4y ago
Ahaha I was thinking of passengers. Hence "how do they get eaten?" But even so, were old car shapes really worse than modern car shapes? Seems like you get hit, you're gonna have a bad time no matter what.
- consp 4y ago
  There is a reason RR and Mercedes don't sell hood ornaments any more in certain markets as an example. They first crush your legs and then shread everything above. I imagine some of the 50s and 60s designs will be worse with sharp corners and pointy spikes.
- ZeroGravitas 4y ago
  Even for people in the car, some older car designs put the drivers legs under the engine block. In a head on collision at speed, the legs were the crumple zone (meanwhile the steering column was being pushed through your torso). edit: also recently people noticed that high 'trucks' would simply miss the crumple zones in the car they were crashing into > Another problem is "impact incompatibility" where the "hard points" of the ends of chassis rails of SUVs are higher than the "hard points" of cars, causing the SUV to "override" the engine compartment of the car.[18] In order to tackle this problem, more recent SUV/off-roaders incorporate structures below the front bumper designed to engage lower-height car crumple zones
  - dumpsterlid 4y ago
    "Even for people in the car, some older car designs put the drivers legs under the engine block. In a head on collision at speed, the legs were the crumple zone (meanwhile the steering column was being pushed through your torso)." Anytime anyone waxes nostalgic about how "they dont make cars like they used" I think about this video. They sure as hell don't make cars like they used too, you can get out and walk away from a crash in your ugly newer car that would brutally end your life in one of those beautiful classic cars. For anyone that is curious the key thing to pay attention to in survivability here (besides yah know... the airbag) is.. does the interior cab of the car change shape? The cab of the old car violently changes shape in a way that would destroy parts of your body whereas the newer car's cab doesnt seem to be affected at all. Even if getting crushed between the seats and dashboard didnt kill you immediately in the bel air, I struggle to imagine how emergency first responders would even get you out of that. https://youtu.be/C_r5UJrxcck https://youtu.be/C_r5UJrxcck

This comment actually got a laugh out of me. I truly have no idea what would be feasible in a collision like this. Probably packing peanuts? Airbags on the outside of the car that deploy when a pedestrian is detected?

wintermutesGhst 4y ago
Pedestrian airbags have been designed before, but don't seem to have caught on widely [1]. A more bizarre solution Google patented always stuck with me: A sticky car hood beneath an eggshell coating so that a struck pedestrian would stay on top of the car instead of falling and hitting their head or being run over [2]. 1: https://www.youtube.com/watch?v=CiiBlirAG8w https://www.youtube.com/watch?v=CiiBlirAG8w 2: https://www.popularmechanics.com/technology/a20953/google-patent-sticky-car-hood/ https://www.popularmechanics.com/technology/a20953/google-pa...
ordu 4y ago
Such airbags would throw a pedestrian away. A long way.
User23 4y ago
There are wearable airbags on the market for motorcycle use. I don't know how effective they are for their intended use or how effective they might be protecting a pedestrian, but it's a technology that exists.

homonculus1 4y ago

It's a far cry from Nerf, with fiberglass on top of it, but styrofoam is actually used inside bumpers

bch 4y ago

I recall one manufacturer popped the hood so that it could act as a shock absorber should a pedestrian land on it... Found it - Nissan has an actuator[0] that lets the cars hood be used as a damper for unlucky pedestrians in case of collision. [0] https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHIVE/PUEHFPP/ https://www.nissan-global.com/EN/INNOVATION/TECHNOLOGY/ARCHI...

boppo1 4y ago

Ahaha I was thinking of passengers. Hence "how do they get eaten?" But even so, were old car shapes really worse than modern car shapes? Seems like you get hit, you're gonna have a bad time no matter what.

consp 4y ago
There is a reason RR and Mercedes don't sell hood ornaments any more in certain markets as an example. They first crush your legs and then shread everything above. I imagine some of the 50s and 60s designs will be worse with sharp corners and pointy spikes.
ZeroGravitas 4y ago
Even for people in the car, some older car designs put the drivers legs under the engine block. In a head on collision at speed, the legs were the crumple zone (meanwhile the steering column was being pushed through your torso). edit: also recently people noticed that high 'trucks' would simply miss the crumple zones in the car they were crashing into > Another problem is "impact incompatibility" where the "hard points" of the ends of chassis rails of SUVs are higher than the "hard points" of cars, causing the SUV to "override" the engine compartment of the car.[18] In order to tackle this problem, more recent SUV/off-roaders incorporate structures below the front bumper designed to engage lower-height car crumple zones
- dumpsterlid 4y ago
  "Even for people in the car, some older car designs put the drivers legs under the engine block. In a head on collision at speed, the legs were the crumple zone (meanwhile the steering column was being pushed through your torso)." Anytime anyone waxes nostalgic about how "they dont make cars like they used" I think about this video. They sure as hell don't make cars like they used too, you can get out and walk away from a crash in your ugly newer car that would brutally end your life in one of those beautiful classic cars. For anyone that is curious the key thing to pay attention to in survivability here (besides yah know... the airbag) is.. does the interior cab of the car change shape? The cab of the old car violently changes shape in a way that would destroy parts of your body whereas the newer car's cab doesnt seem to be affected at all. Even if getting crushed between the seats and dashboard didnt kill you immediately in the bel air, I struggle to imagine how emergency first responders would even get you out of that. https://youtu.be/C_r5UJrxcck https://youtu.be/C_r5UJrxcck