Skipbee, your humor is not lost on me. I've found that people who poo-poo sand driving have never tried it but are somehow an expert. People who have found the 'edge' in the sand know everything they need to know; and find the edge over and over. Around 1976 we drove 125 miles at the surf line in Baja in a Toyota FJ-55 Land Cruiser between San Felipe and Puertocitos. What a ride! We had to steer around the inlets and outlets. The sand changed texture and consistency many times on that trip requiring lower and lower pressure down to 10 pounds and actually raising it on the sharp rocks. Here Dick is lowering the pressure as we try to race the incoming tide: You can see how the rig 'crabbed' along at too high a tire pressure trying to crest the high tide line. We had (5), five gallon jeep cans ( two on the tailgate) and a 53 gallon gas tank, plus 3 spare tires on wheels.
jefe
jefe
Once got hold of a pressure/loadcapacity list from Michelin.
For different speeds and for in Mud/sand and on Track.
Will give the picture of it, but in short.
For in Mud/Sand you can use even 50% of the pressure for 20km/12,5m/h on the road, wich then is the maximum speed to use.
Can go as low as 0.6bar/9psi for a tire with 6 bar/85psi AT pressure, ofcource if the load on tire is low enaug.
My conclusion is that at that pressure on road the tire would bare on the sides and not in the middle, but in sand/mud the underground forms that way that it supports the total surface .
But this is my conclusion, of a self declared tirepressure-specialist, so not a profesional tire-ingeneur.
For on track 80% of the pressure needed for 65km/35m?/h on road, wich then is the maximum to use speed.
Here 2 pictures
For different speeds and for in Mud/sand and on Track.
Will give the picture of it, but in short.
For in Mud/Sand you can use even 50% of the pressure for 20km/12,5m/h on the road, wich then is the maximum speed to use.
Can go as low as 0.6bar/9psi for a tire with 6 bar/85psi AT pressure, ofcource if the load on tire is low enaug.
My conclusion is that at that pressure on road the tire would bare on the sides and not in the middle, but in sand/mud the underground forms that way that it supports the total surface .
But this is my conclusion, of a self declared tirepressure-specialist, so not a profesional tire-ingeneur.
For on track 80% of the pressure needed for 65km/35m?/h on road, wich then is the maximum to use speed.
Here 2 pictures
Driving your truck and camper on the beach? It has been done. There are a couple forces in play here. 1. The weight of your camper. 2. How much floatation you can get with stock size truck tires. Coming from a 'jeeping' background, I've experimented with tire pressure on sand for decades on disparate rigs. There are some must haves.
A tall sidewall is good when you deflate for sand. I've stayed with 16 inch tires on wider steel wheels to allow for a longer and wider patch on sand. There are some good to haves. A super single wheel and tire are the ticket for sand running. Here are the 12 inch wide wheels and 365x65R16 (33x15.50R16) super singles I drove into the ground next to a stock 265x75R16 Michelin:
@ 22 pounds of air, the monsters had a 17 inch wide, by 15 inch long footprint that floated on the loosest blowsand: Here is the appropriate sidewall squat: front stock size @ 22 pounds; rear super singles @ 20 pounds. This is about as low as I would want to go.
jefe
A tall sidewall is good when you deflate for sand. I've stayed with 16 inch tires on wider steel wheels to allow for a longer and wider patch on sand. There are some good to haves. A super single wheel and tire are the ticket for sand running. Here are the 12 inch wide wheels and 365x65R16 (33x15.50R16) super singles I drove into the ground next to a stock 265x75R16 Michelin:
@ 22 pounds of air, the monsters had a 17 inch wide, by 15 inch long footprint that floated on the loosest blowsand: Here is the appropriate sidewall squat: front stock size @ 22 pounds; rear super singles @ 20 pounds. This is about as low as I would want to go.
jefe
