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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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JR---------
JR said:
"When I see someone post something inaccurate or wrong info, I usually say something. So do many others on here and I'm sure we expect to be called
on misinformation ourselves.
The thing is, you spending so little time here, most of your info is wrong, limited, or out of date when it comes to Baja. And there's no hiding
that with double talk."
-------JR This information posted above about David K. is wrong, and inaccurate.
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Bob and Susan
Elite Nomad
Posts: 8813
Registered: 8-20-2003
Location: Mulege BCS on the BAY
Member Is Offline
Mood: Full Time Residents
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Here is an older article on WASHBOARDING
http://www.gi.alaska.edu/ScienceForum/ASF6/619.html
Why Do Roads Corrugate?
Article #619
by Larry Gedney
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This article is provided as a public service by the Geophysical Institute, University of Alaska Fairbanks, in cooperation with the UAF research
community. Larry Gedney is a seismologist at the Institute.
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Washboard roads are a bane to travelers worldwide. This includes, of course, Alaska, where the options for getting away from it all would be limited
indeed if gravel roads are excluded from one's itinerary.
Corrugations that produce washboard roads are not limited to those with sand or gravel surfaces, but are also found in asphalt pavements and even in
railroad tracks, although on a less severe scale.
It would seem that such a common phenomenon should be readily understood and explainable, but the fact is that the process which produces them was a
subject of controversy among engineers for many years.
One of the most popular theories was that a tire, even as it rolls, pushes material ahead of it in a heap.
Once the pile reaches a certain size, the tire rolls over it and starts the process again.
As it developed, this is incorrect.
The January 1963 issue of Scientific American contains an article by Dr. Keith B. Mather, now Vice Chancellor for Research and Advanced Studies at the
University of Alaska, which puts the matter to rest once and for all.
Working at the University of Melbourne, Mather observed that vehicles passing over the unsurfaced roads of Australia's "outback" did not produce dust
uniformly even on uncorrugated roads, but rather in little spurts arising from rapid bouncing of the wheels.
This led to the construction of a laboratory apparatus which would permit the observation of wheel and road interactions under controlled conditions.
The first experiments utilized a five-inch wheel mounted on the end of a shaft which pivoted about the center of a sand track 24 inches in diameter.
Locomotive forces were provided by pushing the arm around the track with a finger.
Unexpectedly, this soon produced little corrugations several inches apart in the sand.
Encouraged by these results, Mather then proceeded to construct a somewhat more elaborate system equipped with a variable speed electric motor, which
drove the axle, a spring-mounted wheel and a revolution counter.
Parameters such as weight, size of wheel and stiffness of spring were made independently adjustable.
Among the more significant findings were that:
If the wheel moves slowly, no corrugations were formed, but a deep rut instead;
it did not matter whether the wheel was driving or idling, at sufficient speeds, washboarding occurred;
the trough-to-trough distances between ruts increased linearly with increasing speed; and
sand was not pushed ahead of the wheel and then overridden to begin another cycle, as had been commonly believed.
The most important contribution to understanding washboarding lay in the observation of how the corrugations are actually formed.
When the wheel reaches a certain critical speed, it begins to move in short hops, bounding on random irregularities of the surface.
Hitting an obstacle, even a small one, propels the wheel into the air for a certain distance. When it lands further down the track, it sprays sand
forward and to the side, thus creating the beginning of a crater.
Each time it digs itself in at a crater it has to ride out again and thus repeats the pattern.
If traffic were to move at widely diversified speeds, different "hop-lengths" might tend to cancel each other out, but depending on road conditions,
all traffic tends to travel in a rather closely constrained speed range, thus compounding the problem with each successive vehicle.
Corrugated roads would be all but eliminated if people followed two simple rules.
First, they must let most of the air out of their tires (hard tires corrugate roads faster), and second, they must be willing to travel at less than
ten miles per hour.
Since it seems unlikely that either of these guidelines would be followed, the only thing that remains is to construct all rural highways out of
three-foot-thick reinforced concrete--not a likely prospect for the foreseeable future.
[Edited on 10-7-2005 by Bob and Susan]
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David K
Honored Nomad
Posts: 64852
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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Thanks Bob & Susan!
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jrbaja
Ultra Nomad
Posts: 4863
Registered: 2-2-2003
Member Is Offline
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Not to change the subject
but are there more repellants at Baja Cactus besides the 5 cans you dropped off David ? I know there is baseball stuff waiting there but as far as I
know, they already gave me the repellants that were there and I took them south a long time ago.
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David K
Honored Nomad
Posts: 64852
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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I am only reporting what Antonio told me, that the case of repellent he took there, from here, that I purchased, was still there.
Antonio is at Baja Cactus right now and will likely IM with me later tonight on his new lap top, so I will have him double check. If it is still
there, would you please pop in and take it south next time?
Thanks JR.
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jrbaja
Ultra Nomad
Posts: 4863
Registered: 2-2-2003
Member Is Offline
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I was told the 5 cans were from you
Did you also buy a case I wasn't aware of? Anyways, as soon as I drive down I will get um. Gracias.
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David K
Honored Nomad
Posts: 64852
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
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I bought a full case (sealed box) which I think was at least 6 cans... but it was so long ago it may have been a dozen??
Perhaps stopping into the Baja Cactus lobby just to see if there is anything for you there (from others who reacted to your requests) would be a wise
regular thing to do... it is staffed 24/7 unlike the other motels in town.
Rather than the baseball equipment sitting there unused for so long, I think the doner okayed that it went to one of the local teams who could really
put it to good use. This is just hear-say, but you can check with Antonio or the person who left it there for you last July, to validate that.
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jrbaja
Ultra Nomad
Posts: 4863
Registered: 2-2-2003
Member Is Offline
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David
When I picked up the bag with your repellants in them last December, that's all they gave me. 5 cans in a bag.
If I could afford to drive down everytime someone left a donation there, I would be very very happy.
I also didn't realize there was a time limit on how long things stay there before being distributed locally. Antonio didn't mention it when I talked
to him a couple weeks ago.
But, now that you are invloved, there seems to be some confusion going on. Like whenever tourists like you get involved with foreign affairs. Outdated information, false information, and exactly what I was talking about in
the other post.
And David, you sure seem to like bringing up my donation program. Maybe you should try it yourself sometime instead of searching for lost missions
and whining about what others are actually doing!
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soulpatch
Nomad
Posts: 404
Registered: 7-30-2005
Member Is Offline
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This was an entertaining thread until you two started your sniping again. Maybe we should ask Doug to have a DK and JR topic heading for exclusive
one-upmanship. Maybe you two could edit your bullchit out of this thread so it is what it started out as. As soon as you do I'll dump this post.
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