Nizwa Dubai an afternoon in Dunes

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Camelchaser
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Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 19. Feb 2017, 20:50

Took the truck out to test a set of new Michelins

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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 19. Feb 2017, 20:51

Camelchaser hat geschrieben:Took the truck out to test a set of new Michelins

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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 26. Feb 2017, 19:28

I went in without deflation at 100 PSI

We had better result at 35 PSI later on

I heard you guys drive MAN 6x6
On road at 80 PSI = 5.5 Bar
Sand dunes 24 PSI = 1.6 Bar (Sandkater)

Please tell me if that's the norm (remember I was unable to find manual on vehicle as yet)

Patrick
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Zentralgestirn
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Zentralgestirn » So 26. Feb 2017, 20:07

Hi Patrick,

nice Pictures you have uploaded.

I would advise you to have a closer look to the datasheet for your specific tire maybe at the homepage of the manufacturer. There are lists for the most tires. Some of them are very simple but for a total understanding you have to pay attention to the wheel load, ambient temperature, tire temperature (carcass), allowed maximum speed for specific pressure, distance to travel with very low pressure and some other facts.

One simple one for example

Wolfgang´s Tabelle

If you more the hands on guy, go down with the pressure you think it´s ok and drive. Check from time to time the temperature of the tire and carcass. With low pressure the tire will do a lot of work an can catch fire if you travel to fast with low tire pressure over longer distances.

Best wishes Sebastian

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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 26. Feb 2017, 20:45

Yes Got tons of pictures on phone and camera, Dubai is great for offroad work, I now started comapny on the side as well www.desert-max.com

Just bought a new set of Michelin 395/85 R 20 XZL2 realy nice tyre.
I see you can drive it at a lot lower pressures then I had thought!
With the tubeless tires do you not run the risk off running tyre of the rim?

We do lots of 4x4 offroad car riding and never go below 15 PSI, to do 25 PSI or even less on such a beast makes me hessitate but I will give it a try!

It will probably resolve my power issues as well as at 35 PSI last week most problems were resolved to come out of "desert BOWL" these are small climbs of say 8-15m at 35-40 degree angels in soft sand, offroad cars do this with ease, I only cary a 2T crane so it should be walk in the park with 16 gears at our disposal. New week we add another 2 Ton module with spare fuel, toilet, shower and kitchen.

Great advise, appreciate thanks
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Desert Dune drive offroad recovery clinic Desert max

Beitrag von Camelchaser » So 26. Feb 2017, 20:59

:D Image
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Uploading buggys
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 26. Feb 2017, 21:01

Nothing is more fun then to go out with a bunch of kids and their parents and practice desert riding
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Desert recovery clinic
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 26. Feb 2017, 21:16

Scorpions difficult to spot without UV light :D
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awesome scorpion during the recovery clinic
awesome scorpion during the recovery clinic
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Zentralgestirn
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Zentralgestirn » So 26. Feb 2017, 21:16

This tire size is not very common for our trucks. We use 14.00R20 and 16.00R20 tires on the genuin KAT-family. But physics are physics and for all the same. Keep that in mind, that nearly all KATs here have other tire dimensions than you and that there is a chance that it would not work 1:1 to you.

I use beadlocks, so 0.7 bar with 16" tires are ok to escape the trap, but the steering is not really possible but no chance to get the tire of the rim. I tried it a bit without any problems. I have not that much experiences with Sand and mud with very low pressure that i can answer your questions with ease.
My very own conclusion of all the postings here in the forum i would say Peter (Sandkater) knows what he says and the pressure he advised you is a well known value here in this space for our trucks.
My experiences ends at 2.5bar for long and fast distances. A little bit of wobbling but no heating up or other problems.

May some other guys here will help you with there experiences.

OT: Nice job. May that would fit to me as well :D

Sebastian

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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » So 26. Feb 2017, 21:18

Ready for Africa expeditions, 60 days from Addis Abeba to Cape town, then new crew will drive back
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LC 79 Desert Max style
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Sandkater
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Sandkater » Mo 27. Feb 2017, 00:05

I went through Sahara Desert with several vehicles. These were / are my settings:
Nissan Pickup, 2,1 to empty, 2,9 to loaded, 265/75R16 BFG MT, tubeless, road 2,3 bar, min 0,8 bar @ max 50km/h
Toyota HZJ79, 2,4 to empty, 3,1 to incl. fuel, food, water for 1000km without supply , 285/75R16 different brands AT type, tubeless, road 2,5 bar, min 0,8 bar @ max 50 km/h, 2 times (in 40 000 km) a tire went off the rim in heavy dunes while cornering.
MAN KAT 4x4:
12 to ready for vacation, 14:00 R 20 Pirelli Pista, Conti, Michelin, road front axle 5,5, rear axle 5,2 bar, in heavy dunes 1,8 bar with tube on steel rims (Sprengringfelge) and 1,6 bar tubeless on aluminum rims with Hutchinson beadlock inside. max speed appr. 40 km/h. I will go down even more if needed, below 1 bar is possible with beadlocks.

the biggest impact on needed tire pressure is based on the load range/ ply rating of the tire.
I have two different tires on my KAT (PR22 / PR20), the tires on the rear axle have less load capacity and therefor need more pressure because the carcass is weaker.
I think, an empty 6x6 goes smoothly round 5 bar. Even 3,5 to of cargo is nearly empty.
Just check the shape of the tire wall: increase tire pressure from 4,5 bar until the tire wall is nearly flat. Not flat like at 100 PSI. As mentioned, check the load range values and play around with different pressure limits.

Concerning your tire size: 395/85R20 is between 14:00 and 16:00, not too bad for that purpose.

this video shows how to mount tires again in the dunes.
This works easily when the tire is free, so one has to lift it completely out of the sand. Remove the valve from the valve housing for free air intake. After the explosion the air will cool down inside the tire and will cause vacuum that will pull back the tire from the rim.
reifen.jpg
This is a car of a friend with 15" rims, but same tire diameter like mine. They moved of the rim relatively often because of the high wall. In this situation it was not possible to lift the vehicle because the tire collapsed going uphill. We ignited with a cigarette lighter and the cleaner spray and pulled the carcass out of the wheel hosing.
Some people use petrol to assemble the tires, but that is less cool than spraying. :mrgreen:

Peter
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Tyre pressures in Deep Sand dunes

Beitrag von Camelchaser » So 5. Mär 2017, 14:13

Dear Kat Forum,
Exellent advise, I read through all tyre specs and we deflated to 25 PSI.
We drove 8 hrs non stop in medium high sand dunes (maximum 90m high) with two pilot vehicles and I did not once get stuck.
So we make good progress now.

I will upload some pictures when I get home tonight.

Now we will improve the suspension on the rear bogey and then start on the big job with the Kitchen/toilet/shower and refueling module this weekend adding 2 Ton weight.

Keep you posted.
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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » Mi 12. Apr 2017, 19:05

Yes module is now on with increased pressure to center axel

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Re: Nizwa Dubai an afternoon in Dunes

Beitrag von Camelchaser » Mi 12. Apr 2017, 19:07

Camelchaser hat geschrieben:Dear Kat Forum,
Exellent advise, I read through all tyre specs and we deflated to 25 PSI.
We drove 8 hrs non stop in medium high sand dunes (maximum 90m high) with two pilot vehicles and I did not once get stuck.
So we make good progress now.

I will upload some pictures when I get home tonight.

Now we will improve the suspension on the rear bogey and then start on the big job with the Kitchen/toilet/shower and refueling module this weekend adding 2 Ton weight.

Keep you posted.
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