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Found 4 results

  1. While offroading, we cross dunes by using different methods, based on how the dune is formed and what the drive level is. Once you have spent some time in the desert, you will slowly start to pay more attention to the dune formations and how we cross them. Once you reach Intermediate and Advance level, you'll need to start learning how to read these dunes in order to navigate and create your planned routes in the desert. As a rule of thumb, the prevailing wind in UAE is blowing from a North-Western direction to South-East direction from 10AM onwards. At night and in early morning it will be reversed and blow from the South-East to North-West. This is something you should remember and you will notice when you zoom into certain areas with your navigation app (Google Maps, Gaia, MotionX, Mytrails,...) you will notice that the wind from that side has caused the dunes to take on their shape. This is a general rule and will not always apply, as you will see that in certain areas where wind is coming from different directions, you will see for example "star" dunes appearing. There are different types of dunes which are separately described below. As you can see in below picture, a dune is formed when the prevailing wind blows on a mound of sand, where the grain will move into the wind direction and create a ridge. The sand which falls on the other side of the ridge, creates a slipface, and this sand is not compacted by the wind. This is the main reason why we generally drive on the prevailing wind side or the convex side of the dunes on the Newbie level. "A dune is a curiously dynamic creature," wrote Farouk El-Baz in National Geographic. “Once formed, a dune can grow. It can change shape and move with the wind. It can even breed new dunes. Some of these offspring may be carried on the back of the mother dune. Others are born and race downwind, outpacing their parents. [Source: Farouk El-Baz, National Geographic, February 1982] The shape of dunes is affected by things like the strength, direction and consistency of the winds; the consistency and amount of sand; the hardness of the terrain and the amount of vegetation. Below we will describe the most common dunes found in the UAE. Different Dunes Crescent or Barchan Dune This is the most common dune. It forms the shape of a crescent moon when the wind blows from one direction. We generally use the words concave and convex to describe both sides of the dune: * Concave is a shape that curves inwards. * Convex is a shape that curves outwards. Crescent-shaped mounds generally are wider than long. On the concave side you will have the slipface. These dunes form under winds that blow from one direction, and they also are known as barchans. Parabolic Dune A parabolic dune is similar in shape to a barchan, but it is just the opposite. The tips of this dune point into the wind, and its main body migrates with the wind, forming a depression between the tips. Because of this formation, parabolic dunes are also known as blowout dunes. These dunes often occur when vegetation stabilizes sediments and a U-shaped blowout forms between clumps of plants. Example of Parabolic dunes near Faya: https://goo.gl/maps/ob8xu3y8VJJvF6hk8 Longitudinal or "Seif" Dunes They are also often referred to to as "sand ridges" or "seifs". Their length can range from a few meters to many kilometers and their height from a couple meters high to a couple hundred meters high. Wind pushes the sand and forms ridges parallel to the prevailing wind direction with slip faces either side of the crest. Linear dunes are straight or slightly sinuous sand ridges typically much longer than they are wide. They may be more than 160 kilometers long. Linear dunes may occur as isolated ridges, but they generally form sets of parallel ridges separated by miles of sand, gravel, or rocky interdune corridors. Some linear dunes merge to form Y-shaped compound dunes. Many form in bidirectional wind regimes. The long axes of these dunes extend in the resultant direction of sand movement. Barchanoid Dunes These ridges are similar to Barchan dunes. They are connected in long crescentic waves as the sand supply is much greater than that which forms a Barchan Dune. Star Dunes These dunes are formed when there are several prevailing wind directions - there is a complex wind regime. Typically there are three or more slip faces, whilst the dunes do not migrate they grow in height. Star dunes are radially-symmetrical, spyramidal sand mounds with slipfaces on three or more arms that radiate from the high center of the mound. They are created when the winds blow equally from every direction, causing the sand dune to grow many extensions and resemble a star. They are rare and are fairly stable and remain in the same place. Some are landmarks with names. Example of a Star dune: https://goo.gl/maps/jRnYghQc8ACzVz6T7 With this knowledge, the next time you step into the desert, you can start looking at the different dune formations, and this will give you lots of knowledge that you'll be able to apply in the future when leading and navigating off-road drives.
  2. Having a refusal or getting completely stuck is something nobody should feel guilty about, since it's part of the off-roading game. It’s also an essential experience in your learning. Somehow, as long as you can understand what happened so you won’t repeat the same mistake over and over, it’s a must to improve. There are hundreds of reasons why you can get stuck. Some of them don’t directly depend on the driver (it can be related to an engine issue, the terrain, the climate, etc.), while others are just mistakes. Some of them are clear and obvious, others are more unpredictable and difficult to identify… As a big fan of @Rahimdad’s What Went Wrong ? thread, it came to my mind that we could simply adapt his brilliant idea by analyzing, not accidents, but stucks, and try to make together a list of all the possible reasons behind them. Please do share here your guesses, explanations... and videos. I’ll start easy, with one of my best stucks this year, which happened in Area 53 two weeks ago (I borrowed the footage from @Javier M). So... who can tell us why I got stuck here ? Stuck_1.mp4
  3. I’ll start with the very unique Badain Jaran desert : Badain Jaran mysterious lakes
  4. Pajero flips FJ in 5 seconds!!! http://www.youtube.com/watch?v=HMLsPrRWjds A rescue mission turned out to be a display of Mitsubishi Pajero Power why do you think they named it FJ... Flip Jeep ??? Alhamdulillah there was no casuality or any major issue to the FJ apart from minor dents. Off Road Lesson learned: - To be careful in assessment of the vehicle & hook position, Should observe well when others hooks the car. It should have been hooked to the left front hook instead of the right!!! regards, Rajeef M
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