Jr.CubBuilder wrote:
Wait a minute, as a former tanker I have to argue that. Ground pressure is total weight divided my the square are of your footprint. Letting the air out of your tires does two things. First it lets the tires spread out, second it allows them to conform to the ground.

Jr.CubBuilder wrote:

a64pilot wrote: It's been a long time ago when I last visited this thought, but except for the sidewall stiffness, the ground pressure exerted by a vehicle is exactly what the PSI in the tires is, regardless of vehicle weight or tire size. IF you ignore sidewall stiffness, I think.
Bet Wup knows

Wait a minute, as a former tanker I have to argue that. Ground pressure is total weight divided my the square are of your footprint. Letting the air out of your tires does two things. First it lets the tires spread out, second it allows them to conform to the ground. As you noted sidewall stiffness will make a huge difference. For sand it's best if the center of your tire is flexible enough to collapse inward with minimal air pressure so you have a sort of inverted rolling trough, it keeps the sand under the tire instead of letting the tire burrow down. If you ever get your car stuck in the sand rather than just spinning the wheels till you're really buried, just let the air out of the tire. Turns it into a nice squishy pad like a camel foot and off you go, of course you have another problem once you get back t hard ground.

lowflyin'G3 wrote:I stopped by there last Sunday with the kiddies.
Funny though, my Copalis looked different than your Copalis Rob.
I did notice that my Garmin 296 put me about 1.3 miles SOUTH of the actual runway area. On the south side of the Copalis river outlet not the north side as it actually is.