Simpson Crossing No10

Submitted: Monday, Oct 16, 2006 at 21:33
ThreadID: 38568 Views:3668 Replies:7 FollowUps:17
This Thread has been Archived
This would have to be the hardest crossing of the Simpson Desert that I have done. The weather was hot and with all the wind over the past few weeks the sand was soft.

Started out at Dalhousie Springs with a hot easterly wind blowing. Two days before that the wind was coming from the north. The wind kept the flies away but it had me a bit worried. One of the members of the convey asked me if the wind would cause any problems. I said lets wait and see.

The run out to Purni Bore was easy enough and the run down the Rig road to our first camp didn't reveal what we were in for.

Once we were on the WAA things started to get tough. Soft sand with a lip at the top of the dune that was almost vertical. The wind from the north had pushed the sand into the left side of the top of the dune. The wind from the east had pushed the sand back to form a vertical wall. The wind usually blows from the west and this makes a easy run up the dune and a steep run down on the other side. Now
we had a gentle slope with a vertical wall at the top and a steep drop off on the other side.

The only good thing about the wind blowing is that the track was not chopped up as much as usual. The wheel tracks that I would have followed were not there, so I had to stop and get out to see where the track went.

I was happy when we made it to the turn off to the Lone Gum Tree. At an average of 10km/h we were dropping behind time and the petrol Prado's were going through fuel quicker than a V8 Range Rover.

After the Lone Gum Tree we continued on the Rig Road to the Knolls Track. We had been able to make up some time but the fuel was starting to be a worry.

When we made camp on the QAA Line we took stock of how much fuel was left and decided that if we pooled our fuel that we should be able to make it to Birdsville.

The dunes on the QAA Line are bigger and getting higher with some vehicles have a few goes at getting over. Tyre pressure was lowered again but this only helped a little. At last Big Red was in front of us. It looked very different. No tracks up the straight run up the face. The side tracks were hardly visible with vertical walls of sand at the top.

I walked to the top of Big Red. The bowl at the top was also different. It was all filled in and the track from the east was a simple drive. A couple of vehicles drove up while I was there and they said it was very easy. When they saw the decent on the other side they said they would wait and see if we maid it up before they would give it a go.

After 3 attempts I asked the back up vehicle to give it a go. He made a bit further than I did but after 2 attempts he also gave up. The rest of the convey also had a go, with a petrol Pajero getting the highest but the sharp turn at the top bringing all the vehicles to a halt.

On to Little Red. Came across a vehicle at the bottom of the dune. He had been there for 6 hours. After a few attempts he was waiting for another vehicle to help him over. While he was waiting he watched the lip of the dune get bigger.

More air out of the tyres 15psi in the front and 18psi in the back. A long run in 3rd high and the first vehicle makes it with the front of the vehicle getting air and sand flying. After that it was a bit easier but sill the toughest crossing I have made.

As far as I know there were no other vehicles to cross Big Red that day and a few had to go around the end of the dune. This is why the crossing of the Simpson Desert or any remote track should not be taken lightly, even if you have done it before.

Wayne
Back Expand Un-Read 0 Moderator

Reply By: Crackles - Monday, Oct 16, 2006 at 21:42

Monday, Oct 16, 2006 at 21:42
Sounds like you had plenty of fun Wayne. Just out of interest what sort of increase in fuel usage did you have with the tougher conditions & how long extra did it take?
Cheers Craig...........
AnswerID: 199476

Follow Up By: Wayne (NSW) - Monday, Oct 16, 2006 at 21:56

Monday, Oct 16, 2006 at 21:56
Craig,

At the end of the trip it only took us an extra 3 hours, but I did change the way we normally go. We had plenty of time to do the trip so time was not as important as fuel.

We filled up at Oodnadatta with V6 petrols having to carry 160lt and the diesel 140lt.

All the vehicles had more than that on board and the worst one had 10lt left at Birdsville. We also had 40lt of petrol in jerry cans that we could have used.

The diesels used a bit more but no more than 160lt

Wayne
0
FollowupID: 458343

Follow Up By: Crackles - Monday, Oct 16, 2006 at 22:13

Monday, Oct 16, 2006 at 22:13
Certainly a good lesson for newby's Wayne that although a diesel vehicle normally gets over using around 100 to 110 litres, under difficult conditions that increased to over 150L & I've seen several Landcruisers cross just using the standard 145L tanks thinking they had plenty.
Cheers Craig.......
0
FollowupID: 458352

Follow Up By: Wayne (NSW) - Monday, Oct 16, 2006 at 22:19

Monday, Oct 16, 2006 at 22:19
Craig,

I fill up at Leigh Creek (280lt) and that gets me to Birdsville with fuel to spare.

I did use more fuel but I was also carrying more weight this year. See my next post.

Wayne
0
FollowupID: 458356

Reply By: fifooz - Monday, Oct 16, 2006 at 21:51

Monday, Oct 16, 2006 at 21:51
Wayne,

Thanks very much for the post, much appreciated. I plan on doing my first Simpson crossing next year and so, good to hear from someone how's done it several (10) times.

Very interesting to hear that the condition was the hardest you've ever experienced. And also, that your fuel consumption was higher than normal.

Once again, very informative and helpful post.

Cheers,
Fifo
AnswerID: 199479

Reply By: Willem - Monday, Oct 16, 2006 at 21:52

Monday, Oct 16, 2006 at 21:52
I can well imagine what you went through Wayne, as when we went north from the French Line earlier in the year we had similar problems.

I know you are a very experienced operator but why you did not drop your tyre pressures down earlier and below 15psi beats me. I had mine down to 13psi cold and 9psi hot to get over the last big on the Rig Road before the Knolls Track.

Cheers
AnswerID: 199480

Follow Up By: Wayne (NSW) - Monday, Oct 16, 2006 at 22:08

Monday, Oct 16, 2006 at 22:08
Willem,

I was thinking about dropping the tyre pressure but had to weigh up between inexperienced drivers on flat tyres or going around on a less changeling track.

The QAA Line was not too bad and it was only driver error when vehicles had to have a second go.

The same with Big Red. Heavy vehicles, soft sand, sharp turn, vertical wall at the top, high speed run up and drivers that have not done this before on low pressure tyres. At the time I opted for Little Red.

Wayne
0
FollowupID: 458349

Follow Up By: Member - Andrew W (SA) - Monday, Oct 16, 2006 at 22:39

Monday, Oct 16, 2006 at 22:39
Sounds just like our experience on the Rig Road - especially that last dune, when we were out there 2 weeks ago.

We were waiting for the cyclists in the SDCC to come after us, and in the space of less than 1 hour, vehicle tracks were nowhere to be seen - the wind was ferocious, and the sand incredible.

I'll be posting some pics soon - great testament to the genus cyclist and it's survival out there.

The important thing in those conditions was to counter the long steep ramp to the vertical face (get a decent run up) and then to have the revs and the right gear to keep the vehicle going up and over without getting airborne - although some of the support vehicles did of course.

Some of the vertical faces on the tops were 9 foot high for the first vehicle of the day (ours - the photographers), although, even though the tracks were covered, the wind did tend to flatten out the place where the vehicles went over.

My old (slow 1HZ) truck was very loaded - down to just 4.5 tonne by that stage, and did it fine on 22 Rear/18 front.

We did Big Red from Birdsville end first, and then turned around, so we had the benefit of going back on the steep faces where we had already flattened them out a bit.

Cheers for now
Andrew.
0
FollowupID: 458361

Follow Up By: _gmd_pps - Tuesday, Oct 17, 2006 at 03:51

Tuesday, Oct 17, 2006 at 03:51
Which Toyota has more than 4.5T gross weight ? (I assume Toyota when you say 1HZ engine) .. I was wondering about weight .. have not been through Simpson and was wondering if I should leave my slide-on at home or not .. want to do it next year ... when you say 4.5t thats not too far off my 5.1t gross weight with camper ...

regards
gmd
0
FollowupID: 458376

Follow Up By: Member - Andrew W (SA) - Tuesday, Oct 17, 2006 at 08:00

Tuesday, Oct 17, 2006 at 08:00
It was overloaded - needed to carry a lot more water than usual - well carried a lot more water than I needed, but cyclists need about 20l per day, and I needed sufficient fuel for the additional back and forward photography excursions along the way.

3850 if the GVM of the 100 series - I am 3040 unladen and with empty tanks unfortunately.

Cheers,
Andrew taking it slow and measured.
0
FollowupID: 458393

Follow Up By: _gmd_pps - Tuesday, Oct 17, 2006 at 12:00

Tuesday, Oct 17, 2006 at 12:00
wow.. quite a risk to take when the gravity point is high
hard work for the suspension and tires ..
well if you made it overloaded like that I shouldn't have a problem
then
regards
gmd
0
FollowupID: 458425

Follow Up By: Member - Andrew W (SA) - Tuesday, Oct 17, 2006 at 12:36

Tuesday, Oct 17, 2006 at 12:36
did I mention the gravity point? It is probably not as high as you assume. A lot of the weight is low (tanks underneath, winch, batteries, people, fridge etc.), and there are always risks, but hopefully understood and managed. The vehicle is raised 4" Rr and 3" front although loaded it settles a few inches.

The suspension is new, and specified for the weight (extra HD), and the tyres are also well maintained - LT-spec too.

Also, I know the vehicle and have done 50 or 60,000 k's of remote desert and challenging driving in it - experience helps, I find.

I come across much lower loaded vehicles with impact-destroyed tires and broken suspension when except for the odd puncture or stake, I can cruise quietly by.

I also find that most people in the remote areas are overloaded - they just don't know it, and their ignorance can come back to bite them.

Cheers
Andrew.
0
FollowupID: 458428

Follow Up By: atoyot - Tuesday, Oct 17, 2006 at 21:46

Tuesday, Oct 17, 2006 at 21:46
Andrew,

I assume that you have had the 100 GVM re-rated to 3850, as the standard GVM is about 3200kg (3180 on mine - 1HZ GXL Manual). If this is the case, what did you need to change to get it re-rated and what were the costs? If not, then according to the books, you're about 1300kg over GVM.

Andrew
0
FollowupID: 458532

Follow Up By: Member - Andrew W (SA) - Tuesday, Oct 17, 2006 at 22:41

Tuesday, Oct 17, 2006 at 22:41
Hi Andrew,

Thanks for pointing out my false perception ... not that it can make much difference. Seems I was mislead and hadn't looked it up for myself.

With the driver, but no fuel I am at 3040 ... so keeping under GVM is almost impossible. I'll take comfort in the fact that I run LT tyres and that I have xtra heavy duty springs and shockers.

The vehicle looks a little different these days - here are some shots from the SDCC a few weeks ago:









Apologies for the advertising on the side, which is hard to avoid.

Cheers
Andrew.
0
FollowupID: 458541

Follow Up By: atoyot - Wednesday, Oct 18, 2006 at 09:27

Wednesday, Oct 18, 2006 at 09:27
Andrew,

I've taken the same attitude to mine. Mine weighed 3500kg with no wife and kids, half fuel, no beer, and half food, so we're around 3800kg fully loaded. I also take a bit of comfort in LT tyres, Ralph shocks and HD springs, and also in my understanding that the fully floating rear axle in these things are under-rated by Toyota. Anecdotally, I have heard that it is not hard to get an uprated GVM with some simple mods that probably don't include much more than what we've already got. I haven't gone down the path of changing the GVM yet, and I'm not sure I will; I was hoping that you had.

How long have you been running with that weight and how many hard kays have you done? I assume quite a few going by the incidental advertising on the side (and checking your web site!). We've never had any trouble, but you're always aware of the weight and the way the thing handles a bit differently, but driving to the conditions and double checking everything constantly might help head off any trouble. Insurance is another issue though.....

regards

Andrew
0
FollowupID: 458593

Follow Up By: Member - Andrew W (SA) - Wednesday, Oct 18, 2006 at 09:38

Wednesday, Oct 18, 2006 at 09:38
I've done 90,000 k's which includes about half highway driving and half dirt roads through high country rock, simpson desert dunes, flinders ranges creeks, central Australia tracks and nullabor limestone - generally the off-road is loaded, and about half the highway stuff is loaded.

Like you I keep an evil eye on every nut and bolt and haven't had a problem yet.

I have it on good advice that there is no insurance exclusion for stupidity and that insurers aren't at present concerned about overloading. They have just recently started picking on obscene trailer loads without brakes.

Cheers,
Andrew.
0
FollowupID: 458600

Reply By: David from David and Justine Olsen's 4WD Tag-Along - Monday, Oct 16, 2006 at 21:55

Monday, Oct 16, 2006 at 21:55
It is amazing how much it changes isn't it. We were expecting a difficult crossing earlier in the year, and then there was quite a bit of rain, and the trip was much easier, though there was an awful lot of water around. The Hay river however, had some very dry wind blow dunes.
AnswerID: 199481

Follow Up By: Wayne (NSW) - Monday, Oct 16, 2006 at 22:14

Monday, Oct 16, 2006 at 22:14
David,

Hope to do the Hay River Trip next year. I am really looking forward to it.

I saw a ExplorOz sticker on a double decker bus with your name on it. I think you know where that is.

Wayne
0
FollowupID: 458353

Follow Up By: David from David and Justine Olsen's 4WD Tag-Along - Monday, Oct 16, 2006 at 22:27

Monday, Oct 16, 2006 at 22:27
G'day Wayne

Yeah a big yellow bus, I reckon I know the one.
The Hay is unique, Lindsay's operation is first class. Lindsay wasn't there this trip but Kevin and Billy looked after us really well. You will love the trip.

David

0
FollowupID: 458357

Reply By: Member - Jeff H (QLD) - Monday, Oct 16, 2006 at 23:02

Monday, Oct 16, 2006 at 23:02
First time to Big Red, (Nov '99 I think), was a cake walk, as in soo--- ?
Ahem.(Not so young, but certainly naive:[read 'stupid'].
Next, Sept '02, again pretty good.
Third, Dec '02, and the easterly had sculpted a superb lip at the top, no way I was driving down that! (We had come up from Warburton Crossing, hit some damp salt , so had to go right back, and visit from the East).
Most recently, similar to the above, (which is pretty much what you describe), but a fart in a bottle by comparison.
We made it over (just) probably because we were first vehicle of the day.(Used 5/3 low, as I recall). The turn N and small lip at the crest were the killers.

More variable than a fast forward of phases of the moon!

(incidentally, I recently used live.local search to view Old Andado to Birdsville, and said to the Missus, 'Gees, if I knew Martians saw it like that, I never would have dared take you there.)

The Bride, (unblushing), replied 'bull bleep !'

Wayne, thanks for the update. In future, the Centre may well become stickier, as the E. edge becomes hotter and looser. What's the go to the West?
AnswerID: 199493

Reply By: Richard W (NSW) - Tuesday, Oct 17, 2006 at 07:27

Tuesday, Oct 17, 2006 at 07:27
Thanks for the heads up Wayne. I'm planning to do the Simpson again next year, hopefully Hay River.
AnswerID: 199520

Reply By: Member - Coyote (SA) - Tuesday, Oct 17, 2006 at 15:29

Tuesday, Oct 17, 2006 at 15:29
It;s kinda funny how all the advice etc seems to be that crossing W to E is the easiest.. not sure exactly what dates you were there but I have just come back from corssing E to W (2-5 Oct 06) We were driving an 05 4.3 TD GU and I think I had to reverse and give 2 dunes a second attempt on the whole crossing... kept the tyres at 18PSI all the way from Big red to Mt Dare.. apart from being flaming hot it was a dream crossing as far as technicalities go (French Line)
I had to laugh at the attmepts people had made to try the "smooth stuff" out aroun Peopples corner on the Salt lakes.. sooo tempting after all those moguls but most of the track went out, got awfull deep and then came back to the main track pretty quick... next time I think we'll go a month or so earlier..
AnswerID: 199561

Follow Up By: Member - Phil G (SA) - Tuesday, Oct 17, 2006 at 22:40

Tuesday, Oct 17, 2006 at 22:40
Coyote, Glad you had a good trip. Hope the flies didn't eat you alive!
Advice can easily become dated. The common tracks are well used now, so theres always reasonable approaches and chicken tracks if needed. I reckon these days, half the vehicles travel from each direction so it doesn't much matter. The west sides are usually bumpy, the east sides are usually steep but smoother.

Like Willem, we lower our pressures early when the sand is soft - like down to 12-15psi makes it easier on the vehicle and the fuel consumption is better. We last did the French Line in August and used 94 litres from Oodnadatta to Birdsville. Also the dunes are easier in the mornings.

Different story when you do the tracks further north - Madigan Line is still best from the West. And early this year, when things were soft, the lower end of the Hay River run was very difficult heading south.
0
FollowupID: 458540

Follow Up By: Willem - Wednesday, Oct 18, 2006 at 07:51

Wednesday, Oct 18, 2006 at 07:51
Hi Phil and Coyote

Having criss-crossed the Simpson, with and without a trailer, I have found a happy medium on how to get over the dunes. This year west to east was the ususal with the exception of 1 to 2 metre sand drifts at the top of some dune crests. East to west was a tad easier on the French Line. Off track was hard going into the Northern Territory but still manageable.

My old GQ plodder has that much grunt over dunes that I very seldom have to back down. I drop the tyres to 15psi at the start of dune country and drop them even further is necessary. With very low tyre pressures I can stop at the bottom of a dune, select either 1st High or 2nd Low and amble up and over(trailer included), whether there be a track or not. I came unstuck once, off track, after cresting a dune to find it blown away on the east side and the trailer weight pushed the GQ sideways which needed some evasive action.

When I first commenced desert travel in the 1980's, I used to rush dunes but have since learned my lesson over the many years of doing this caper and don't rush dunes anymore. It is a waste of time and energy. Just drop the tyre pressures(even with splits) to suit your needs. If you need to reinflate to a higher pressure later, then do so, as it doesnt take that long. I have only run a tyre off a rim once(splittie) and that was at Robe on the beach dunes.

Cheers
0
FollowupID: 458574

Sponsored Links

Popular Products (9)