- Dec 30, 2016
- Reaction score
Door pillars don't look all that strong. I'd assumed that the car ended up being upside down when being hitched to a tow line and being winched to the beach, thus being dragged upside down in shallow water the weight of the vehicle being towed from a line attached to the chassis, the roof taking all the weight of the car and the friction of being winched in would've dug the roof in scooping sand as front windows were open making the roof a sand anchor, thus would've popped the roof virtually off the car as it was forcibly dragged to shore. Thus I think the damage was inflicted in it's recovery. The back seat probably floated out through the open window as a lot of cars of that era, the back seats weren't bolted on but clipped on for easy cleaning, like my old 1st car, a HR Holden. IMO.Spinnaker, I agree the ocean is a force and decided to try to calculate the impact of the force of the car hitting ocean and comparing to other scenarios.
The damage to the Fiat is very specific, with the roof crushed to almost the bottom of the windows, looking at the small picture of when it was dragged out of the ocean (attachment at end of this post). It looks like the point of impact was the roof. Have hardly ever heard of the damage being discussed in newspaper, let alone any investigation into this. So a while ago I decided to try and calculated the forces experienced on the car and compare to the corresponding damage to the car, all based on a 1968 Fiat 125.
Be aware serious maths ahead.
Whenever there is an interaction between two objects, there is a force upon each of the objects. Force is a quantity that is measured using the standard metric unit known as the Newton. A Newton is abbreviated by an "N." One Newton is the amount of force required to give a 1-kg mass an acceleration of 1 m/s/s. It is calculated by multiplying the mass of the object and the acceleration or deceleration of the object of something hitting the object. F = m x a.
To calculate force needed to damage 1968 Fiat 125 in different scenarios, you first need to calculate or estimate acceleration (or deceleration) for each scenario.
Acceleration is the rate of change of velocity with respect to Time.
Acceleration= (V2-V1) km/h / Time (s) required to travelling this distance.
1 The train hitting the Fiat deceleration was a = (39 0) divided by 32sec =1.219 km/hr.s
2. Fiat rolling 4 times, est. a = (100 to 0) divided by 4 sec =25 km/h.s
3. Fiat driven into ocean at Cott boat ramp est. a = (10 to 0) in 4 sec = 2.5 km/hr.s
Fiat hitting groyne while in water est: a = (2 to 0) in 4 sec = 0.5 km/hr.s
4. Fiat accelerating off groyne and hitting rocks or water est: a = (60 to 0) in 4 sec = 15km/hr.s
1. Train hitting Fiat. Hit at 39 km/hr and took 32 sec to stop.
My answer on google as to how heavy is a locomotor engine was 192,000196,000 kg.
F = m x a F = 192,000 x 1.219 = 65,013 N
2. Fiat rolling 4 times (you tube clip) Wikispecs give mass of 1968 Fiat 125 as 1150 kg
F=m x a F = 1150 x 25 = 7,986 N
Screen grab after 3[SUP]rd[/SUP] roll shows little structural damage, mostly wheels.
3. Fiat driven into ocean at Cott boat ramp
F = m x a F = 1150 x 2.5 = 798 N
Fiat hitting groyne while in water
F = m x a F = 700 (lighter in water) x 0.5 = 97N
May hit groyne more than once but may also have no acceleration, which is a change in velocity. Movement in water may be a constant velocity.
4. Fiat accelerating off groyne and hitting rocks or water.
I used a very generous 60 km/hr for this calculation as Id estimate it would need about that speed to ramp over the rocks. However it is a driverless car. It would almost certainly drift to the south and not to Cott beach if it launched off groyne.
F = m x a F = 1150 x 15 = 4791 N
Driving the Fiat off the groyne (4,800N) generates much less force and less damage than the fiat rolling 4 times (8,000N), on a road at a speed of 100km/hr. The Fiat rolling on the road had minimal structural damage despite larger estimated forces.
The actual damage to the car as shown by the small picture below, IMO caused by something is closer to being hit by a train at 39 km hr (65,000N) than any scenario entering water at Cott (1000N?) or rolling 4 times on hard surface at 100 km/ hr (8,000N).
These forces are estimates and only to give a general idea of the forces necessary to cause damage to 1968 Fiat 125. Regardless IMO, someone went to enormous effort to put the car here, for reasons very important to them.
It sends a westerly beacon, but there has to be more to it than this.
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