Team-BHP
(
https://www.team-bhp.com/forum/)
-
Road Safety
(
https://www.team-bhp.com/forum/road-safety/)
In the video, a Hyundai Santro can be seen toppling an Endeavour. The reason given is that the speed of Santro disturbed the Centre of Gravity of the Endeavour thus making the Endeavour to lose balance. But this still shows that having a bigger sized car can only give a false sense of security.
https://youtu.be/g0gvZ9WvBs4
Quote:
Originally Posted by gopalnt
(Post 4609453)
In the video, a Hyundai Santro can be seen toppling an Endeavour. The reason given is that the speed of Santro disturbed the Centre of Gravity of the Endeavour thus making the Endeavour to lose balance. But this still shows that having a bigger sized car can only give a false sense of security.
|
Wow, that is something I never expected to see. Shows how unpredictable an accident can be, and how the best lab tests cannot even imagine this kind of a real life scenario
Hope all the occupants were buckled up and didn't have any major injuries.
Weight X square of speed approximates kinetic energy. The Santro's speed plus it's wedge like nose which got under the belly of the Endeavour caused the roll over. We can't conclude that a bigger car gives us a false notion of safety. Just that in a particular circumstance a 1000 kgs car at xyz speed can roll over a very slow moving 2000 kgs car. The experts can add more.
More than the toppling, key thing to know is how the passengers in both cars fared. Assuming passengers were belted, I assume that the passengers in the endeavour would have had a lesser chance of injury inspite of toppling, and that is what is important.
By the looks of it, the Santro collides with the Endeavour somewhere near the rear door and rear wheel region. This makes the Endeavour rotate around the front axle, creating a moment strong enough to lift the car around the front axle (at first) and then rear axle.
No wonder the high CoG is the culprit. But I am surprised that the anti-roll bars didnt work as expected. Does the Endeavour come with one?
Despite the obvious error of judgement by the Endeavour, I hope the occupants are all safe and sound.
The Santro's wedge like nose had nothing to do with the roll over. The Santro hit the Endeavor at almost right angle and the Endeavor started to spin around. The rear right wheel dug into the ground and hence the roll over.
Surely an unexpected outcome.
The accident however, was caused by the driver of the Endeavour. He thoughtlessly turned, without bothering to wait for oncoming traffic, or grossly misjudging the speed of the oncoming car. Could be his overconfidence, assuming everyone would take corrective measures, for his "big" car :Frustrati
Quote:
Originally Posted by V.Narayan
(Post 4609463)
Weight X square of speed approximates kinetic energy. The Santro's speed plus it's wedge like nose which got under the belly of the Endeavour caused the roll over. We can't conclude that a bigger car gives us a false notion of safety. Just that in a particular circumstance a 1000 kgs car at xyz speed can roll over a very slow moving 2000 kgs car. The experts can add more.
|
I think, more than the size, it is the relatively higher center of gravity (relative to the track width) which makes a tall SUV to be less stable than a low slung sedan (sports car will be even more stable). In this case, the angle at which the Santro has struck the Endeavour could have made any other car to topple.
Quote:
Originally Posted by Rajeevraj
(Post 4609464)
More than the toppling, key thing to know is how the passengers in both cars fared. Assuming passengers were belted, I assume that the passengers in the endeavour would have had a lesser chance of injury inspite of toppling, and that is what is important.
|
I don't see the Santro's bonnet crumbling at all. The driver of that can also be seen opening the front door. We can assume that the Santro braced the impact well. And as far as the Endeavour is concerned, it has toppled but everything including the windows seem to be intact. Not sure about the passengers though.
Cant understand why people are getting surprised by the fact that, the SUV toppled !
Its simple physics.
Higher center of gravity = Less stable
Lower Center of gravity = More stable
A Honda Civic or a VW Jetta in place of the Ford Endeavour would have fared much better.
In case of a frontal head on collision between the Santro & Endeavour the result would have been different. Santro will get much more damage than the Endeavour.
Attaching few more examples-
A Fiat Avventura, T-Bones a bus and the bus topples-
https://www.team-bhp.com/forum/road-...ml#post4131639
Please view this you-tube video-
The cars and vans with higher center of gravity fared much worse than the sedans.
https://www.youtube.com/watch?v=jscp7wyMeXM
:OT The Swift Dzire accelerated at the right moment to avoid getting hit by the Santro!
Quote:
Originally Posted by gopalnt
(Post 4609453)
But this still shows that having a bigger sized car can only give a false sense of security.
|
This is a freak replication of a well trained pit maneuver.
Quote:
Originally Posted by VaidhiR
(Post 4609466)
No wonder the high CoG is the culprit. But I am surprised that the anti-roll bars didnt work as expected. Does the Endeavour come with one?
.
|
Anti roll bars would not play any role here because they are supposed to limit body roll during high(er) speed cornering. They are almost helpless at a low speed rollover of the entire car
Quote:
Originally Posted by niteshbids
(Post 4609560)
Anti roll bars would not play any role here because they are supposed to limit body roll during high(er) speed cornering. They are almost helpless at a low speed rollover of the entire car
|
True. Also, the antiroll bars are designed to limit the 'body' rolling in relation to the wheels (which are in contact with the ground). They don't help if the wheels themselves loose grip and come off the ground.
That DZire had a great escape; that said more than going into the physics of the accident, I think there must be a speed bump or barricade at such places where the vehicles are made to slow down and allow the Endy or any other car to turn safely. Fault lies with the Endy for not allowing the Santro to pass before negotiating the turn.
I am happy to see the out come of the crash. Both cars did good (at least from the visuals).
Santro, even being two decade old design shows the quality of Hyundai. Crumple zone absorbed the impact well, there are no visual indication of cabin structure damage & occupants seemed to walk out on their own.
Where as, although Endeavour turned turtle but one can clearly see the side AirBags are deployed & roof is taking the full load of this 2+ ton vehicle without getting crushed or deformed.
If the Santro had ABS (along with some good tyres) may be it could have avoided the impact.
Only thing one can ask is the Anti roll over protection for this Endeavour but I guess the road design & perfect timing of the impact & worst possible place created this unique condition to allow CG take over & cause this roll over.
| All times are GMT +5.5. The time now is 16:48. | |
