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Techniques Winching - Recoveries - Chainsaw Safety - Proper aproach to 4wding etc

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Old 18-06-16
spot01 spot01 is offline
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Default Experiment on vehicles crossing flooded waterways

An interesting study on the effect moving water and depth has on vehicles crossing waterways:

http://www.weatherzone.com.au/news/c...-danger/524452
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Old 18-06-16
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As the adds keep saying in Qld....If its flooded, forget it. Yet we still get people swept away in cars during floods. Darwins way of keeping the nup-nups in check.
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Old 18-06-16
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Originally Posted by Dicko1 View Post
As the adds keep saying in Qld....If its flooded, forget it. Yet we still get people swept away in cars during floods. Darwins way of keeping the nup-nups in check.
We had some pretty bad weather in NSW last week, and so many people still tried to cross flooded roads. Had 3 people die when they/their cars were washed away, and so many people getting cars stuck in the flood waters because they thought they could get through (despite there being other cars stuck in the flood waters they were about to go through!).
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Old 18-06-16
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Saw it on one of the morning shows this morning.
I thought it was pretty speccy to see the pootrol sitting in the tank with the water level at just below bonnet height and because the back end was floating, the two people in the tank with the car could push it around with little effort.

You'd think that most people would be well aware of the drama's flood waters can cause and that it's frikin' dangerous to try and drive through them, there having been heaps of rain on the east coast over the last couple of years or so, but alas it seams those that try to get through have the same mentality as those muppets on the road that just have to get there first come hell or high water.
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Last edited by dhula; 25-06-16 at 09:56 PM.
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Old 24-06-16
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Just another Darwinian moment. No amount warnings can save some people from themselves.
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Old 25-06-16
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people dont seem to be aware that a (relativley) enclosed vessel will float even if it will keep running.the big 4wd in some ways will be worse of cos they have a big volume to offset the big ger mass
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Old 25-06-16
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Default Buoyancy

It is also worth noting that once the water is even just a bit above floor level, even though the vehicle may not be floating, it is gaining buoyancy & becoming lighter. As a result, there is less weight on the wheels & less traction - I suspect this is one reason why vehicles tend to get bogged in river beds more easily. Combine this with flowing water and .
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Old 31-07-16
scribble88 scribble88 is offline
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Thanks for sharing Spot01.

That was amazing to read.

I am a city slicker from WA, we don't get flooding like you eastern state-ers do. I wasn't aware of how little water it takes to move the car.
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Quote:
Originally Posted by spot01 View Post
It is also worth noting that once the water is even just a bit above floor level, even though the vehicle may not be floating, it is gaining buoyancy & becoming lighter. As a result, there is less weight on the wheels & less traction - I suspect this is one reason why vehicles tend to get bogged in river beds more easily. Combine this with flowing water and .
Your theory makes total sense & also makes sense why tray back utes i've driven quite deep were fine, less buoyant back half of vehicle.

So that also makes sense why you see 4wd's in Cape York once the water is waist deep inside vehicle they tow out easier, they've become one with the elements
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Quote:
Originally Posted by Jasonmc73 View Post
Your theory makes total sense & also makes sense why tray back utes i've driven quite deep were fine, less buoyant back half of vehicle.

So that also makes sense why you see 4wd's in Cape York once the water is waist deep inside vehicle they tow out easier, they've become one with the elements
Not quite, Jaso.

Once there is water inside the vehicle buoyancy is lost and the vehicle can be move difficult to recover.
If the water level inside the vehicle is higher than the outside, and this can happen as you tow the vehicle out, the water trapped inside adds to the weight of the vehicle so it is a good idea to crack the doors open as the vehicle is recovered so the water can drain out.

A traytop also has the advantage of less side area down low so there is less side pressure on the vehicle if the water is flowing.

A cubic metre of water is 1000litres and 1000kg in weight.

Remember a snorkel does not turn your 4wd into a submarine, most modern cars will have their electrics/electronics drown before the engine ingest water. Often a snorkel can give you a false sense of security so you tackle deeper water crossings with less preparation. Once the water is deeper than 400mm or 500mm then it is best to fit blind to the front of the vehicle so water is not forced through the grille and radiators and into the engine bay. If the water is dirty then any water that is force through the radiators will leave a deposit of silt. This silt quick builds up and blocks the air channels of the radiator and will lead to overheating!

Those spectacular fast drives through dirty water for the classic "I am tough" photo can easily lead to overheating problems later.

OJ.
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