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wsdunc
Nomad
Posts: 179
Registered: 8-24-2006
Location: So Cal
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Mood: Upbeat
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Pargo,
You made me smile. Maybe 15 years ago we camped at the beach near ligui. Where we went you actually went past the town dump, but then continued a
few hundred feet to a beautiful deserted beach. I was driving the Baja Beast, a 71 dually with a chassis mount camper (with a flip down rear patio
and sliding glass doors in the back). My method was to get near the beach, turn around, and then reverse towards the beach. Once I got stuck that is
where we stayed for the week, when it was time to go we figured out how to get unstuck. Scheduled the unsticking for early in the morning when it was
cool
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bajalou
Ultra Nomad
Posts: 4459
Registered: 3-11-2004
Location: South of the broder
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Here is a link to a rather extensive article regarding tire pressure and footprint - good reading for anyone going off road in sand - beaches, washes,
etc.
http://www.4x4now.com/sfjun96.htm
No Bad Days
\"Never argue with an idiot. People watching may not be able to tell the difference\"
\"The trouble with doing nothing is - how do I know when I\'m done?\"
Nomad Baja Interactive map
And in the San Felipe area - check out Valle Chico area |
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Sharksbaja
Elite Nomad
Posts: 5814
Registered: 9-7-2004
Location: Newport, Mulege B.C.S.
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Interesting Lou.
I don't believe that you can achieve the equivalent traction of 16(regularly inflated?) tires by 4 (underinflated) tires. That just seems a bit much
imo.
Like I said, I air down as needed. I just need more log time!
Hey Roy, what pressures did you use in the wash? Up that last hill?
DON\'T SQUINT! Give yer eyes a break!
Try holding down [control] key and toggle the [+ and -] keys
Viva Mulege!
Nomads\' Sunsets
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Matt&Mutt
Junior Nomad
Posts: 50
Registered: 3-11-2008
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Highway pressure
Also, it's unlikely that most people are driving around with the max allowable pressure in their tires. My Wrangler's got some squirrely emergency
handling to start with, and there's just no way I'd be running 50 psi in my BFG A/T's unless I wanted to do some loopies on the freeway. Typically I
run 30-32 cold pressure all the way around.
There's no noticeable bulging until you get below 20 psi, which is also around when you can detect an audible lessening of the sound of the escaping
winds--takes me about a minute to get to 20 psi. Just a mild airdown makes the washboard a much more pleasant situation & will extend the life of
both your dental work and your suspension significantly.
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805gregg
Super Nomad
Posts: 1344
Registered: 5-21-2006
Location: Ojai, Ca
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One of the things I learned early (1960's) in Baja, is to stop and walk the road before you get stuck. A little walk is better than alot of digging.
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Gadget
Senior Nomad
Posts: 851
Registered: 9-10-2006
Location: Point Loma CA
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Mood: Blessed with another day
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One common misconception of the "bulging" side wall that makes the tire float. This is showing you that the "contact" patch of the tread has
lengthened, thus floating the tire, much like a track on a tractor does.
"Mankind will not be judged by their faults, but by the direction of their lives." Leo Giovinetti
See you in Baja
http://www.LocosMocos.com
Gadget |
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David K
Honored Nomad
Posts: 64489
Registered: 8-30-2002
Location: San Diego County
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Mood: Have Baja Fever
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Yes, the buldging sidewall is not what you want to support the vehicle weight... but the max. wide footprint is.
It really works, no need to walk 20 miles to San Felipe for a tow truck!
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Matt&Mutt
Junior Nomad
Posts: 50
Registered: 3-11-2008
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| Quote: | Originally posted by David K
Yes, the buldging sidewall is not what you want to support the vehicle weight... but the max. wide footprint is.
It really works, no need to walk 20 miles to San Felipe for a tow truck! |
Walk 20 miles to San Felipe ?? That's why I've got my "emergency" bicycle strapped on the back of the Jeep !! Cept, when I backed into that cholla
last week in Arizona I do believe I smoked the rear tire. Ok....guess walking it'll be !!
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David K
Honored Nomad
Posts: 64489
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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| Quote: | Originally posted by Matt&Mutt
| Quote: | Originally posted by David K
Yes, the buldging sidewall is not what you want to support the vehicle weight... but the max. wide footprint is.
It really works, no need to walk 20 miles to San Felipe for a tow truck! |
Walk 20 miles to San Felipe ?? That's why I've got my "emergency" bicycle strapped on the back of the Jeep !! Cept, when I backed into that cholla
last week in Arizona I do believe I smoked the rear tire. Ok....guess walking it'll be !! |
Photo by Amo Pescar in Valle Chico, 2-01
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David K
Honored Nomad
Posts: 64489
Registered: 8-30-2002
Location: San Diego County
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Mood: Have Baja Fever
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Photo of David Eidell's leg, Valle la Bocana, 7-01
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kodiak
Nomad
Posts: 106
Registered: 5-13-2007
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I pulled 3 different people off of Playa Norte while I was there. The poor fellow in the Ford and fifthwheel camper, was surrounded by the high tide
when he ran over to my site. I wish I could have gotten a picture about 40' back from where this was taken.....It was really sunk.
Another one, was a small rental car that was buried so bad, they could not open the doors! Water was actually lapping up to the trunk's lid. It was
parked with the rearend of the car facing the water.
But, the best one, was a 4X4 Chevy Blazer S-10 that was in the process of trying to get his wave runner out of the surf once he had it on the trailer
and hooked to his truck. He had really aggressive mud tires that buried his truck almost instantly. He had the attitude that spinning the tires at
excessive speeds would eventually free his situation. That made for a real show, as he was throwing sand everywhere and cutting his front wheels back
and forth. Throwing it into reverse and drive, over and over with his foot on the floor.
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kodiak
Nomad
Posts: 106
Registered: 5-13-2007
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Stuck in the sand picture
He got a rash of ribbing for this stick.....his wife had an "emergency" of the lavatory kind, and he had to pull over "right now!!" All he had to dig
with was an old frying pan. Lucky there was a road crew near by...great bunch of locals that would not accept any compensation for their trouble.
[Edited on 5-7-2008 by kodiak]
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kodiak
Nomad
Posts: 106
Registered: 5-13-2007
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Opps...I meant for this to be under the "how not to get stuck thread"
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Gadget
Senior Nomad
Posts: 851
Registered: 9-10-2006
Location: Point Loma CA
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Mood: Blessed with another day
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| Quote: | Originally posted by David K
Yes, the buldging sidewall is not what you want to support the vehicle weight... but the max. wide footprint is.
It really works, no need to walk 20 miles to San Felipe for a tow truck! |
The tread is only as wide as it is. It cannot get any wider and is becoming deformed if the side walls are actually doing any lifting of the vehicle,
which they don't.
If viewed from underneath, say through a glass surface, the contact length of the tread at say your average psi may be 4" long, front to back on the
tread. Width will always be the same unless of course the tire is grossly overinflated which would cause the tread pattern to bulge in the middle and
be narrower.
Now let air out of said properly infalted tire and you will see the tread width stay the same, but length front to rear, of the contact patch of the
tread will go from say 4" at 35 psi to 8" at 15 psi. Thus it becomes more like a track on a dozer laying across the sand rather than pushing /
rolling through it. You have now gone from driving on 4 tires to 8.
You now have an improved length of the tread, not width.
[Edited on 5-7-2008 by Gadget]
"Mankind will not be judged by their faults, but by the direction of their lives." Leo Giovinetti
See you in Baja
http://www.LocosMocos.com
Gadget |
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Barry A.
Select Nomad
Posts: 10007
Registered: 11-30-2003
Location: Redding, Northern CA
Member Is Offline
Mood: optimistic
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| Quote: | Originally posted by Gadget
| Quote: | Originally posted by David K
Yes, the buldging sidewall is not what you want to support the vehicle weight... but the max. wide footprint is.
It really works, no need to walk 20 miles to San Felipe for a tow truck! |
The tread is only as wide as it is. It cannot get any wider and is becoming deformed if the side walls are actually doing any lifting of the vehicle,
which they don't.
If viewed from underneath, say through a glass surface, the contact length of the tread at say your average psi may be 4" long, front to back on the
tread. Width will always be the same unless of course the tire is grossly overinflated which would cause the tread pattern to bulge in the middle and
be narrower.
Now let air out of said properly infalted tire and you will see the tread width stay the same, but length front to rear, of the contact patch of the
tread will go from say 4" at 35 psi to 8" at 15 psi. Thus it becomes more like a track on a dozer laying across the sand rather than pushing /
rolling through it. You have now gone from driving on 4 tires to 8.
You now have an improved length of the tread, not width.
[Edited on 5-7-2008 by Gadget] |
Translation: ------ tires with low air pressure go thru the sand better and tires with high pressure.
Moral: --------partially deflate tires when in the dirt.
barry 
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Sharksbaja
Elite Nomad
Posts: 5814
Registered: 9-7-2004
Location: Newport, Mulege B.C.S.
Member Is Offline
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and be careful of sharp or pointy objects at speed.
and bring a hi-lift jack with sand-friendly base and a spare.
and
and
whatever, who gives a rattsass anywaaaaaaaaaaay? Unless you get stuck that is.
DON\'T SQUINT! Give yer eyes a break!
Try holding down [control] key and toggle the [+ and -] keys
Viva Mulege!
Nomads\' Sunsets
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