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We always hear Marshals and Experts recommend to use "momentum" while driving in the desert. As this most favorite advice is given, or sometimes shouted through the radio (“BUILD YOUR MOMENTUM”, or “KEEP THE MOMENTUM”) heads bob in confirmation, and a murmur of "yes" and "understood" runs through the briefed convoy. But how many really know what momentum is? Do we confuse it with speed, acceleration, or what else? Without going too much into the physics of it, let us see what we really mean with "momentum". THE WHAT Momentum is the product of the mass of a particle and its velocity. It is a vector quantity: i.e., it has both magnitude and direction. In other words, Momentum is the force that exists in a moving object. To make some examples, a moving truck has more momentum than a car driving at the same speed because the truck has more mass. Similarly, a fast car has more momentum than a slow truck. When you are driving, you and your vehicle have momentum force, based on the total weight of your vehicle and your speed. While you are driving, momentum keeps your vehicle moving, unless it is acted upon by something, such as your brakes, a fixed object (such as a tree), another vehicle.... or the road surface. Enter our deserts' sand: this shifty, soft surface interferes with momentum. On a flat track, sand will simply reduce the speed at which you are driving (as the vehicle will tend to sink in it and encounter more friction). The loss of momentum will make the car eventually come to a stop, much quicker than on a harder, more compact tarmac road. Much like a jet ski on water, the more momentum your vehicle has on sand, the smoother it will glide, or 'plane', across the surface. That is why it is important to keep your speed up on sand - without overdoing it. THE WHY On a dune, we will have to contend not only with the sand’s friction, but also with the infamous force of GRAVITY!! As we all know, on Earth all bodies have a weight, or downward force of gravity which Earth's mass exerts on them, proportional to their mass. The heavier the object (read car), the stronger the downward pull. An object (car) placed on a tilted surface (dune’s slope) will tend to slide down the surface. The rate at which the object slides down depends on how tilted the surface is: the greater the tilt of the surface, the faster the rate at which the object will slide down it. In physics, a tilted surface is called an inclined plane (in desert off-roading is called a …. dune). Objects are known to accelerate down inclined planes because of an unbalanced force. Determining the net force acting upon an object (car) on an inclined plane (dune) involves dividing the gravity into two perpendicular components. On inclined planes (dunes_ the force of gravity, in fact, will be equal to the sum of two components - one parallel to the inclined surface and the other one perpendicular to the inclined surface. The diagram below shows how the force of gravity has been replaced by the two components - a parallel and a perpendicular component of force. Taking a leap from the purely mathematical explanation of these dynamics to a more intuitive representation, (see figure attached) you may think of the right momentum (the car’s mass times its speed) as producing F1, that is the force that “anchors” the car to the slope/dune, being greater than F2. However, removing, or significantly reducing the element of speed, leaves only the weight of your car in play, thus prompting it to slide down the dune. Clearly, when momentum is lost, F1 will start to become smaller and smaller, and the component of gravity that will prevail will be F2, pulling the car toward the bottom of the slope. When this happens, you’ll hear the second most shouted command by a Marshal or Expert: DON’T FIGHT GRAVITY (as you’ll never win). And remember, you’d better not!!!

Dear Lislaili adventurers, The route from Lisaili to Last Exit has some of the most mazing dunes in our region, some fantastic wide swooping dunes and if we get it wrong, some of the most technically challenging dunes this country has to offer. So you better all hope that the navigation works out. So far, confirmed on the RSVP are: Jon M @Jon M Jack Thomas @Jack Thomas Nizam Deen @Nizam Deen RaYan E @RaYan E Yusuf Esaf @Yusuf Esaf luwaimn @luwaimn Yasas Dharmadasa @Yasas Dharmadasa Athula Dharmadada @Athula Dharmadada Niki Patel @Niki Patel This drive is managed by myself and @Lorenzo Candelpergher. If you don;t have the needed 5 drives under your belt (I think that's why Ken signed out), or your not ready for a fast paced, technical challenge where we will try to cover the whole route to Last Exit do think carefully about if this is the drive for you. If that's what you do want, we are going to make this an incredible drive with a few unexpected surprises to come. Tuesday is almost over - only two more sleeps till Friday. See you soon in the sand.

It’s the same principle applied to explain it . Flip or the multiple flip ( roll over and over and over ) on incline or flat . In flat there is outward force ( off set by the incline and not shown in ale’s diagram ) so the only thing what prevent the car from flip is its weight and velocity ( momentum ) ... when you are doing sidy in a pretty inclined curve you should keep the velocity constant in a steady given direction . If you slow down , then direction has to change toward and not against FII ( in the diagram ) so the trajectories are parallel or more let say convergent on one line and not divergent ) otherwise the mass of your car will come in to parallel with FII and here is exactly where you flip over because no matter how powerful is your engine to offset ( fight ) this is of no use see below this ( I have posted before also in the thread of what went wrong ) @Ale Vallecchi excellent post I have always loved applied physics , but not at times of university sure 😆

@Mohamed Abo ElKomsan and @Mahmoud Asar I have updated the meet point. @GauravSoni @Thomas Varghese you are 1 and 2 respectively on the waitlist however I don't envisage there being any issues re adding you. Unless we have a last minute stampede for the drive

The proper constant Speed is the key the higher the incline the higher the speed ( thing of a roll coaster ) . Regarding lift kit ( center of gravity ) should be offset by proper spacers. That’s why you see the army hammers already wide in platform and tires spaced properly . Regarding sand wall build beside tires that’s an additional favoring reason ( imagine on flat tarmac when drift attempt vigorously immediately flip is imminent and happens ) that’s what I think to best of what I know . sure more experienced leader comment is of more than a mine of gold to be taken in consideration 🙏🏻

Rear differential lock is always an added and expensive feature in all model of cars, so I highly doubt it can be ever become a standard feature, worth double checking it before buying. Also central differential is pretty much standard feature in most cars, which automatically get engage when you shift to LO gear. Central differential lock split fix power of 50:50 on front and rear wheels. Rear differential lock will further split 25:25 power on rear left and rear right wheels to help you get unstuck when your 3 wheels are stuck even. I have had Patrol GL swb model and I didnt had rear differential lock.

This article reminds me of my sports, I skateboard on bowls, and the speed will determine how far and how high I can go, same on surfing, I can only ride the wave and do turns depending on my speed, or I will sink... it's all in the centrifugal force to keep the gravity in your favor...

thanks for the nudge in the right direction @Niki Patel

@Alex Sidorov, If it’s a long dune climb I turn off the AC ... windows remain closed in my car even though it gets hot just to save me from cleaning the interiors again 😅 sand gets in very easily .... Learning from @Brette, I try to keep the car in 2nd and 3rd most of the time, unless a challenging dune. sometimes I Feel with the AC on I’d have to downshift sooner and often, btw I use manual/ paddle shifters as Sand mode tries to maintain the car always on higher revs ... which just puts extra strain on engine cooling system... in my opinion.

@topgear the setup is called Indeflate (South African company). If you go their actual site you will find their official UAE/Dubai distributor (we not able to name garages here). https://www.indeflate.co.za/retailers.html A lot of the usual 4*4 shops are now selling them also... try the official dealer first as they have really good after sales if needed. there are a ton of firms making similar now however this was almost the same price as the independent made ones and highly reviewed ... just under 800aed if I remember. Some great videos online to make your own however I found once you add all the parts up and the mistakes I would make the cost difference is minimal.

1st drive

It would be my 1st drive. Thanks.

That’s why I chooses to be an orthopedic ( bone ) doc as it needs ton of “physics “ 😅

I drive a LC V6 , it is a very comfortable car on the sands the crowl system is amazing it helps you a lot when you are stuck . it is a little bit under power because of it's heavy weight ..off course the v8 is much power full but the v6 would do it is job for casual off road . With LC no headache in mechanic or electric or heating . same as if you are driving in the city. Oil change , filter nothing else ....... the front pumper is not high , it comes two parts , I removed the bottom part to avoid damaging it . I am still in Fewbie level an till now i am so happy with my LC . Now I bought a Pajero 2020 3.8L 0 KM at a good deal .I will drive the Pajero in my off road drives for Fewbie plus level and higher levels hopefully if i got promoted . I will have more experience and would not be worried about damaging my LC anymore and will keep the LC for casual off road drives

Please let me know if this is your first or second drive for the week? @Pacific @GD27 As you all know, first preference will go to waitlised members who don't have any drive, and hence we request you to mention so that all have a fair chance to get on drives Waitlist 1. Gautam 2nd drive 2. Watteau 2nd drive 3. Junaid120120 2nd drive 4. Jasim Khumi 1st drive 5. Pacific 1 st drive 6. GD27 1 st drive

@Mohamed Seidam now my most important doubt. If you know all this applied physics why did you opt to become a doctor? 😅

@Mohamed Seidam my only doubt is because somewhere I read the car flips over because the sand starts to build up like a wall at the point of contact of the tires which are at the lower level. My understanding is a body over turns because the center of gravity point exceeds the critical angle. Now again my subsequent doubt creeps in my mind. If its the center of gravity point exceeding the critical angle which causes the flip isn't it more safe to keep the car at stock height rather than lifting it? I think the Marshals here can clear this doubt very easily as they know the answers to most of the reasons which cause a flip over and must have seen it all. Does lifting a car beyond its stock height really increase the chances of a flip over? Of course lifting must be helping in crossing over ridges and criss crossing.

Fantastic article @Ale Vallecchi !

Very clearly explained by @Ale Vallecchi. Just made me recollect my Eng Mechanics during my 1st year in college. It would be even better if @Ale Vallecchi can explain why the car will flip if it fights Gravity and starts to fish tail. I have understood up to the point DON"T FIGHT GRAVITY. This article will be complete if you can give the explanation to why the car will roll over if anybody fights GRAVITY.

TEAM WORK

THE MARSHAL @Chaitanya D

Thanks Brette, still waiting for my first drive...let me know if a slot opens.

Hi @Shiroy Tarapor - I got my car last November, it is a Super Safari year 2017, Short Wheel Base (SWB), and I am very happy with it. My first time in the sand with it was during a Carnity Master Class, 72 Km in a little over 4 hrs, during the trip I had a few refusals and I was able to self recover following instructions of the Marshall. Since then I've joined more Carnity drives and the experience driving it has been just great. It is a car with a powerful engine, it has just the basics, there is no additional technology, for example a TPMS that will tell me the pressure on all 4 tyres, yet I like the "rustic" vibe it has. For me it is the right car and I feel safe in it. Hope this helps and please let me know if you would want any additional information.

Time to train sales guy then, to read the website. For a moment I thought it could be new (nightmare) change to have super safari without RD, but then Nissan Dubai website shows that Super Safari has a rear differential lock. https://en.nissan-dubai.com/vehicles/new/patrol-safari/super-safari.html

Good point about leaving the hoses flat in the trunk to let them cool down. Cleaning the air filter can be done by removing it and slightly "tapping" it on the floor, you will see most of the sand will easily fall out. The 5 year warranty is a great thing and i considered a MM too, but as i am seriously impressed with the Camel brand single big piston model (160lpm) We've been using now for the third year (only replaced the hose once:60 AED), i went and bought another one yesterday for 250 AED. Fingers crossed and hope this one will be as good as my first Camel compressor.

I ended up getting the "Mean Mother" compressor as it finally arrived back in stock. 735 AED @Chaitanya D your point about giving the compressor a break - i plan to use the Indeflate 4 hose setup to inflate all 4 tires at the same time... will share my experience after this weekend.... it breaks the guidance however still stays within the Duty cycle. I did a test run with the built in compressor (NSV) and all 4 tires from 14PSI-33PSI ... it took near 20mins with the current set up and the ends of the hose was very hot. This weekend, considering the advice above, i will inflate all 4 tires at once using the Mean Mother and rather than rolling the hoses up, just lay them flat in the trunk for the drive home to cool and not risk cracking. thanks for all the tips.... the 5 year warranty was the swinger for me to choose Mean Mother over the Dobinsons (Though i am sad i don't have a little tank to aid cleaning the air filter as the force straight from the compressor is a little weak)

This drive is organized in full compliance with the COVID19 guidelines. We expect every member that joins this drive to go through below information and and strictly follow these guidelines in order not to jeopardize someone's health, and to ensure we can keep organizing these drives safely. MUST READ AND TOTALLY AGREE: COVID19 Precautions MUST READ AND TOTALLY AGREE: BAN POST Two Way Radio Guidelines Every Offroader brings his own radio, programmed to the frequencies described in below advice topic. We will not share spare radios or program your radio on the drive. If you need assistance in programming the radio, post a topic on the Carnity website with your questions and we will help you out. Make sure your radio is fully charged. It will be your only way of communication while driving. Before buying, please carefully read below advice so you are informed properly on which model / cost / shops... No radio = No drive. It is an essential tool and you should make sure you bring it on every drive and learn/practice how to use it. Drive Details Level: Intermediate When: 05 Feb 2021, Friday Meeting time: 7:00 AM (SHARP - Without any exceptions). Meeting Point: https://goo.gl/maps/eDLJG6uJmW7d4BraA Type of Car: Any proper 4x4 with front and back tow hooks and 8-10 inches of ground clearance. What to bring along: Loads of water, snacks (for yourself), smiles, face mask, rubber gloves, enthusiasm and willingness to learn. Approximate finish time: 11:00 AM P.S. Only join if you have a compressor to inflate your tires after the drive. LIMITED SPOTS AVAILABLE: Limited to 10 cars only. RSVP will close on Thursday - 9 AM. If the RSVP is full and you wish to join, please mention your name on the drive thread to add on the waiting list. Latecomers will be returned back - without ANY EXCEPTIONS. Members without RSVP will be returned back - without ANY EXCEPTIONS. Please withdraw your RSVP, if you aren't joining, so your spot can be taken by others. Repeated no-show members after RSVP will have their account suspended for a month. PLEASE RSVP ON THE BELOW CALENDAR EVENT

Hi mrs @Foxtrot Oscar I hope you doing well I have joined your drive as my first drive

@Brette @VipinShetty Guys, another quick technical question. What do you think of driving with closed windows and possibly AC running? Yes/No? I’ve noticed few cars doing so during last ride. whats your take?

Hello Frederic, I did the absolute newbie drive with @Wrangeld last Friday. I try this one on the waiting list as it's the same area I go solo, to get more confidence there.

@Chaitanya D even though I cannot join this mid week drive I love the idea so consider a +1 in spirit from me if you measuring the experiment/interest! Hope to join a future drive and this time is great ...!

Spend time doing the full comparison independent of the sales person as Gaurav mentioned many of them not always trained with all models. Below for ease is the brochure and the final pages list all the features across all models ... seems dif lock is now standard which is great but highlight the differences and bring them up here if you need opinion quick edit having gone through the brochure... like you I would be tempted by the entry level model now! Save 20-25k. I would miss parking sensors as I have terrible spacial awareness ... however those are easy retro fit if needed! This is a tougher choice than I thought/remember! Manual seats and manual temp is no issues at all.... cloths seats combined woth the absolute bare interior only adds to the car being made for the desert the one modcon I missed and spent on was decent speakers as the route to our drives are usually 3hr round trips... but that’s only a fraction of the 25k saved potentially ... good luck and keep us posted! NISSAN-PATROL-SAFARI-CATALOGUE.pdf

@Shehab Alawadhi, Me and my Jeep posed for you. Didn't that come out well?😜

Hi @Srikumar yes im in thanks c u there!

So we can join this and the regular drive on Friday too. Thanks. I'm in.

Me too

Apologies, fixed now.

It is a weekday drive my friend on Tuesday.

Pls add me to the waiting list thanks Harold

Hello @Vanessa8580 , would you please add me to the waitlist. Thanks

I have a Nissan Patrol 2020 V8 5.6L. First and only SUV I drove in the desert. I learned off-roading with her from scratch, so no terms of comparison. Nissan Patrol is a very heavy car to handle, and is certainly not the most agile one on the sand. The most frequent and nasty stucks are on flat areas, where the car sits on her belly and, being very heavy, is hard to move, especially when the spare wheel gets to tuch the sand (i.e. when you dig in with your rear wheels). As it is a long wheel base, it also requires a bit of learning in order not to get crested. In my early times I had a lot of issues with fishtailing as well, as the back is quite heavy. Having said all this, once you learn how to handle it, you can have great fun and the car definitely is a very very capable one. Further comments on the V8 5.6L 2020 version: 1. Engine is great, very generous with 400HP and 560 Nm torque. Probably more power than needed in 95% of off-road driving conditions, to be honest. But, boy, when you floor the throttle, she sky rockets (or she digs herself down to hell, if you exaggerate!!). 2. For proper off-roading the front bumper needs to be: a) the stock "off-road" and not the "city" version b) protected with a proper, very solid and well designed skid plate c) cut when you reach a level where you attack slip-faces, with the bottom protected with a steel rod or replaced entirely with an off-roading bumper (which is crazy expensive if you want it light in aluminum or crazy heavy if you want it cheap in steel). 3. The back bumper is OK, but needs protection with a light skid plate to avoid having it ripped apart by scooping the sand when the dune entry/exit exceeds the departure angle. 4. Rear mudguards need to be removed or they will suicide soon by breaking just below the bumper connection, but with that they will very likely rip apart your bumper from the side, which is quite a painful experience. 5. You will also need 18" rims with all terrain high profile tires (I have the Kumho 275/75R18 AT51) and as you learn how to handle the beast you can deflate them down as low as to 10.5psi (but usually 12psi is enough). The learning curve, however, implies a good deal of pop-outs before you get there with confidence.. The good part of this is that you will master pop-out recoveries like no-one else.. 6. Don't trust the stock hooks in the trunk to hold down your off-roading gear. They will be soon gone and Nissan seems to have a thing against replenishing their stocks. Best solution is to order a good number of spare ones, so you can replace them by yourself when they will inevitably fail. 6. About electronics... After approx 65 drives I had an issue with the electric motor starter which had to be overhauled because of some sand infiltrations which made it fail. Approx at the same time I also had to replace the crankshaft position sensor, which turned out to have a manufacturing defect. In both cases repairs were done under warranty. I also had issues with the steering wheel button to engage the cruise control, as it was stuck due to some sand having gone deep inside. I had the steering wheel disassembled, air-blown and reassembled and learned to keep the windows up when I do side slopes or attempt self recoveries to avoid sand showering the whole car inside.. 7. The rear diff lock takes a bit to engage/disengage. In one occasion, which @Gaurav probably remembers, I was royally stuck during an Advisors' drive, and was unable to get it to work. Other than in that occasion, it always did what it was supposed to do. 8. No crawling mode on Nissan Patrol. But that will give you the pleasure to listen to @Gaurav teaching you the famous (or infamous.. it depends) "blip-blip" technique, which actually got me out of trouble numerous times and ultimately works with any non-Toyota cars.. Overall, I think the car is great on the sand if you are geared for riding a big whale on desert waves.

It's so lucky you had a Camel compressor to work on this weekend