maxingout
Adventurer

DON'T DO STUPID THINGS
My first trip into the Empty Quarter of Saudi Arabia taught me the most important lesson of desert exploration that I ever learned: DON'T DO STUPID THINGS! The desert is unforgiving and doesn't treat fools lightly. Here is how I learned that lesson.
After a four hour drive from Riyadh, we arrived on the northern edge of the Empty Quarter and filled up with gas at Harad. We left the asphalt and half a dozen cars lined up on a desert track awaiting instructions for our first trip into the Empty Quarter. We stopped our vehicles and gathered around our fearless leader. Our plan was to drive south into the twilight and set up camp in the dark when we had some distance under our belt on our way to Nadqan.
We returned to our vehicles, and everyone started their engines except for one vehicle. A Nissan Patrol came all the way to the edge of the Empty Quarter only to have its starter fail. The battery was fine, but the starter was dead. Zero, zip, nada.
We were up to our axles in disappointment. The sensible thing to do would be to abort the trip into the Empty Quarter. Everyone had prepared for the trip, and this was the only time the white Nissan could go. It was at that point we decided to do something stupid. We made the decision that we would push start the vehicle and forge ahead into the desert with a broken starter. Fools walk in where angels fear to tread.
We started up our Defender and headed into the Empty Quarter. We were about to learn an important lesson. Push starting cars in the sand dunes does not work well. On a positive note, we were on the threshold of learning how to recover a bogged vehicle with no functioning starter.
The trip to Nadqan is not particularly arduous unless you do stupid things. Nadqan formerly was an Aramco outpost when they explored the Empty Quarter for oil. Large corrugated tracks took us south over the gravel plains and sheet sand of the northern Empty Quarter. As long as we stayed on the track, going was easy. If we left the track, going was more challenging mainly because we were novices and did not know what to expect or what we were doing.
We set up camp and were excited that we had actually made it into the Rub-Al-Khali. The next morning we push started the Nissan and resumed our journey south. So far so good.
Then we came to the sand dunes. That's when we realized the error of our ways. We had done something stupid.
The white Nissan Patrol got stuck in the sand dunes at least ten times. Recovering a vehicle that does not have a starter means you have to extract the vehicle from the sand with either a winch or snatch strap with no help from the vehicle that lies dead in the sand. To top it off, the ambient temperature was in excess of 100 degrees. This was the recipe for heat stroke as we recovered the vehicle again and again.
The individual driving the Nissan Patrol was a novice the same as us, and we were amazed at how many times he became stuck. After extracting the vehicle half a dozen times, he asked us whether he should put the vehicle in four wheel drive when he got stuck. Unbelievably, he had been driving in the sand dunes in two wheel drive, and the only time he put the vehicle in four wheel drive was when he got stuck. At that point, our fearless leader went apoplectic. What we were doing was dangerous because of the extreme heat. We were digging with shovels, placing sand ladders, winching, pushing the Nissan by hand in more than one-hundred degree temperatures for hours on end. My wife became overheated turning beet red, and we aborted heat stroke by loading her up with fluid and putting her in the shade.
It took a long time to recover the Nissan because when the driver stalled the engine, the only way to get the car started again was to winch it, tow it, and push it to firm ground where the vehicle could be push started once again. Sometimes the vehicle had to be moved long distances before we could reach hard ground and get the vehicle running on its own power.
We learned lots about recovering bogged vehicles with winches, sand ladders, shovels, and snatch straps. We learned that you don't go into the Empty Quarter unless you are carrying a spare starter. We learned that when you take novices into deep desert, you don't assume anything about their skills in running their vehicle. You must have them demonstrate that they know how to put their vehicle in four-wheel drive, and they must demonstrate their ability to actually do it by watching them make it happen. Finally, we learned to not do stupid things. If a vehicle does not have a functioning starter, it does not go into the Empty Quarter.

WHEN YOU ARE IN A HOLE, STOP DIGGING.
The first lesson of sand driving is that when you are in a hole, you stop digging. Whatever you were doing that got you into the hole, you must stop doing that, and start doing something positive. If you don't stop digging, you will only make vehicle recovery more difficult.
What exactly is digging? When you spin your tires without making any forward or reverse progress, you are digging.
Green Defender is not going any where except down if I continue spinning the wheels. All forward progress has ceased, and spinning the wheels only digs the Defender in deeper making the situation worse and the recovery more difficult.
The rear wheels have dug in further than the front because there is more weight on the rear axle (13 jerry cans of fuel plus water and camping gear). Since the rear wheels are following in the track of the front wheels, they are usually deeper in the sand than the front when I bog down. The rear wheels are always running in a hole created by the front wheels. Sometimes the front wheels are buried deeper than the rear, but that usually reflects an anomaly in the softness of the sand. Occasionally the rear wheels may be on firmer ground than the front, and the front sinks further down than the rear.
When we first started driving we in sand, we did a lot of digging. We would optimistically spin our tires until we were terminally stuck. It didn't take long to figure out the error of our ways.
We learned from our mistakes and changed our approach. When we drove in the sand, and it became obvious that we were going to bog down, we stopped the car before we had much wheel spin. Then every able bodied person got out of the vehicle and pushed. Sometimes the driver even pushed. He put the car in first gear low range, hopped out of the vehicle and pushed with everyone else. In first gear low range on a Defender, you can walk alongside the vehicle at a leisurely pace for hours on end, and the vehicle will never leave you in the bull dust. With four people pushing, the truck would have enough forward motion that the tires would bite into new sand, and it would move forward without digging in. We have used the pushing technique hundreds of times to get through a patch of sand that would otherwise stop us in our tracks. You quickly develop a sense of the possible when driving in sand.
The pushing technique has one limitation. It works best with white Defenders, because in the blazing hot Arabian sun, you can cook an egg on the surface of a green Defender. When you get out to push, you put on gloves so that you don't burn your hands while pushing. If it's winter, then gloves are not necessary, but when it's 100 degrees and full on sun, it's time for gloves for everyone who's going to push.
In the real world of sand driving, we did a lot of pushing if it avoided getting seriously bogged down. But even when we were pushing, if there was no positive movement of the vehicle, we stopped. It doesn't do any good to push when the tires are digging in.
Although it should go without saying, you don't push uphill. If you are going to push, you push on flat surfaces or downhill. You are not going to recover a fully loaded expeditionary vehicle by pushing up hill. There is one exception to this rule. If you drive your truck into a hole, you may actually push the truck uphill as it drives back and forth in the hole trying to get up enough speed to blast out of the hole.

TIRE PRESSURES
My first few trips into the desert sands, I followed the advice of our expedition leader regarding the best tire pressure for driving in sand. We followed a masochistic ritual of lowering our tire pressure to 25 psi and driving until someone got stuck. Then we would lower our tire pressure to 20 psi and drive some more until another vehicle got stuck. Eventually we dropped the pressure down to 16 psi, and people rarely got stuck.
I always wondered why we didn't immediately drop the tire pressure to 16 psi when we entered the dunes. It made sense to me, and finally I made 16 to 18 psi my modus operandi in the sand dunes of the Empty Quarter.
We ran modified sand tires called Michelin XS. These tires have soft sidewalls and balloon nicely when running in sand at 16 psi. Green Defender shows the appearance of the Michelin XS running in the sand. We ran on Michelin tires at those pressures for years, and we never had a tire failure or lost the bead. We never slipped a rim, and I do not know of anyone who slipped a rim at those pressures when operating in the sand.
The Michelins did well at those pressures as long as we were in the dunes driving at speeds of up to 45 kilometers/hr. If you ever ran on asphalt with the Michelins at 16 psi, you would quickly destroy them. They would get so hot that you could not touch them. One Defender in our group once had a slow leak that he did not know about, and he drove on the asphalt on a soft tire until someone noted what was happening. He pulled over to the side of the road, and we could not touch the tire without burning our hands. We had to wear gloves to take the tire off.

In the daytime, tires may be running in an ambient temperature of 100 or more degrees. At night, the temperature in the desert can easily drop 40 degrees.
When you wake up in the cool of the morning and look at your tires, they may appear disturbingly flat. 16 psi in 100 degree heat sometimes is less than 10 psi in the morning. You look at your rear tires and wonder if you have a slow leak. We never discovered a leak. The tire was down because of the cooler night air.
We got out our ARB compressor and brought the tire back up to 16 psi before we left camp. Later in the day when things warmed up, we let some air out of the tire to get it back down to 16 psi after the tired heated up.
You can tell that it got cold in the desert at night in this picture because the tire is ballooning so much, and the person sleeping on the roof rack is bundled up in a cool weather sleeping bag.

The sand equation changes significantly when you run Shaheen sand tires on your Defender. The Shaheen and similar tires do extremely well in sand. They have excellent flotation with higher tire pressures, and the situation only gets better as you lower tire pressure. White Defender is running Sumitomo Shaheens. Shaheens are great on sand, but dangerous on wet highways. They hydroplane like you are driving on ice. Scary stuff when you apply the brakes, and the Defender floats down the highway with a mind of its own.
The lead vehicle in the dunes does all the route finding. If there is a soft stretch of sand ahead, he is the one to discover it first. It's extremely helpful for the lead vehicle to be running a set of Shaheen sand tires so that he is not always getting stuck, and we are not spending hours each day recovering his vehicle. Shaheens make a big difference. A lead vehicle equipped with Shaheens and a heavy foot on the accelerator makes it possible to cover much more ground because your column of vehicles is rolling rather than recovering stuck vehicles.
The lead vehicle lays down a set of tracks that reveal where the sand is soft and where it is firm. That gives the following vehicles a great advantage. When you see a soft patch ahead, you put the hammer down and blast through. You can only do that because a route finder showed the way with his Shaheens.

I have seen things done with Shaheens that I could never do with my Michelin XS. The Toyota Landcruiser in this picture soldiers on through a sea of soft sand on his Shaheens. I watched this vehicle air down to 8 psi and drive out of soft sand. The disciplined driver does not spin his tires and dig in. He puts the transfer case into low, and slowly moves forward a millimeter at a time.
Having the ability to drive out of a bogging is worth it's weight in gold when you have lots of miles that you want to cover. If you can drive out with low tire pressures, then you abort all the drama of a full fledged vehicle recovery.
If this Land Cruiser cannot drive out, then you have to walk down from the top of the dune and tramp through all of the surrounding sand to find some firm ground. Then you have to get a vehicle to that location to participate in the recovery without getting a second vehicle bogged in sand. Once you have a plan, it's winch or snatch strap time if fate smiles favorably on you. If you are not lucky, it's time for the sand ladders, shovels, and pushing.
In ten years of driving in the Arabian desert, I have seen a Shaheen lose its bead and slip on a rim only one time. That incident did not happen in sand. It occurred on firm ground as a Defender was entering a deeply grooved track at an oblique angle, and when the tire slid suddenly into the track with a sharp lateral movement, it broke the bead and slipped the tire on the rim. Not a bad record for a ten year period.
My comments about dropping the tire pressure to 16 psi apply only to driving in soft sand. We often varied our tire pressure according to prevailing conditions. On the highway, I ran 45 psi on the rear tires, and 35 psi on the front. When we headed off-road, those levels of pressure would result in a jarring and uncomfortable ride that was hard on the truck. We could drop the front pressure to 25 psi and the rear pressure to 35 psi to be kind to ourselves and our vehicle.

When it was time to air up, we used an ARB air compressor to bring tire pressure up to 35 psi all around. It took about four to five minutes per tire when the compressor was new, and as the compressor aged, it took five to six minutes per tire.
We are sand people, and we spent about 70 percent of our desert time in the sand. Camping is better in the sand, and driving in it is pure joy. We camped in the desert between sixty and ninety nights a year, and even in the summer time, we would go up into the dunes at twilight and set up camp as the cooler evening temperatures set in. Because we spent so much time in the sand, we gave our ARB air compressors a good workout. On average we found that an ARB air compressor would last two years with that type of duty cycle. When the compressors became tired, we either rebuilt them or purchased new ones. We carried a rebuild kit in the truck in the event of a compressor failure which never happened. I did all of my rebuilds at home.