Event pada: 19 Mei 2007
Gambar2 berkualiti tinggi boleh didapati daripada:









Sources from http://www.fourwheeler.com

4x4 Rainforest Challenge, Malaysia

Winching and 'wheeling at the annual Malaysian junglefest
By Martin Brink
Photography by Martin Brink, Vivek Sharma
4X4 Vehicle Front View Water Night

4X4 Vehicle Drivers Side View 4X4 Vehicle Under Water Driver 4X4 Vehicles Front View Bridge
4X4 Vehicle Drivers Side Hill Pull 4X4 Toyota Front View Tires 4X4 Vehicle Passenger Side View Driver



Tempat: Kuala Nerang
Tarikh: 29 April - 3 Mei 2005
Gambar2 ini dicurik dari http://korok.fotopages.com






4x4 (four by four)

vehicle with 4 wheels powered by 4 wheels - 4WD or AWD (four wheel drive or all wheel drive).

4x2 (four by two)

vehicle with 4 wheels powered by 2 wheels - 2WD (two wheel drive).

6x6 (six by six)

vehicle with 6 wheels powered by 6 wheels - 6WD



In 2WD the traction (resistance) of only two wheels is used for forward movement. The other two tires have traction as well, but they are just rolling along. In rear wheel drive vehicles the front tires' traction is used to steer the vehicle. If more torque is applied than there is traction available, the 2 tires will break lose and start spinning. Once the tires are spinning, we say "we lost traction". So, if in need of more power/torque to move more weight or to go faster more traction is needed.

That can be achieved by sending some of the torque to the other two wheels (4WD) and using their traction as well. So, in 2WD torque is equally applied on 2 tires and the traction of those two tires has the burden of supporting the engine's power - each powered tire has deal with 50% of the available torque.

In 4WD torque is directed towards 4 tires. In 4WD the traction at each powered tire has to deal only with 25% of the torque created by engine, transmission, transfer case, and axle. Since each tire in 4WD has to carry a much smaller torque load (25% instead of 50%), it is much much less likely for the tires to break lose. That is why a 4WD can climb much steeper grades than a 2WD.

4WD was invented to use the traction of all 4 tires to either move more weight or drive on surfaces with marginal traction, or both without wheel spin.



Historians seem not certain who invented four wheel drive. According to what I found on the internet, the first 4WD vehicle was designed by Ferdinand Porsche (the founder of Porsche cars) for the Austrian truck manufacturer Jacob Lohner in 1900. The first vehicle in the history of 4WD had electric hub motors on each wheel - the engine powered a generator for power supply.

First mechanical 4WD (transfer case, drive shafts etc.) was built by the Dutch company Jacobus Spyker in 1902. Since the Lohner/Porsche four wheel drive has such an unusual status with its electric hub motors the Spyker should be considered the world's first four wheel drive.


The world's first automaker, Daimler Benz has a solid place in 4WD history as well. Mercedes started building 4WD vehicles 1903 - some of them already with all wheel steering.


The first US four wheel drive vehicle, was built 1911 by the Four Wheel Drive auto company (FWD).


"Hidup ini ibarat lautan yang luas terbentang, kadang kala tenang, kadang kala bergelora. Namun sejauh mana pun kita pergi, kita pasti akan kembali... Ibarat ombak yang setia pada pantainya...."

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