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travis martin

New member
Jan 18, 1999
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Vic, dangit, I guess I'm not expressing myself well at all; I agree with
every word you said. My point, however, is that Tom, in my opinion, was
getting the short end of the stick because he didn't sugar coat what he had
to say. As to cutting off dialog, that was my fondest hope...if it could be
cut off from the direction it was heading. I agree that, as you put it,
Tom's comments were intimidating. And that engineering types are the worst
"offenders"...Tom epitomizes the engineering type. I personally think that
is an enormous asset. Arch wants to be the great facilitator, qualifying
everything he says with "this is what I'm doing, I'm not telling you that
you have to do it." That's fine, even commendable, but does the fact that
Tom is so much more brusque mean that he should be ostracized? PLEASE
understand that I am not criticizing Arch; I am merely pointing out the
difference in presentation.

As to your statement "paint a corner, put a person in it, etc" I agree 100%;
as I say, my impression was that this was happening to Tom. This is the same
Tom who went to an enormous amount of effort and I'd think no little expense
to cause each and every person here to have the opportunity to own, at his
raw cost, a superb tool for an extremely specialized item of maintenance. I
think the town drunk deserves better treatment. One thing I learned when I
was a cop is that almost everyone, hardened criminals, drunks, almost
everyone, responds favorably to courteous treatment.

You're definitely on to something on the engineering types; human thought
process is part reasoning, part emotion. The ratio varies with the
individual. The dreamer type, as typified by Arch (again, not a criticism at
all; he describes himself as a dreamer) tends to mix more emotion, less
reason; the "engineering type" as exemplified by Tom tends to be more
rational, less emotional. Of course this doesn't mean that either is not
capable of both types of thoughts; Arch is very obviously capable of reason,
and I'm pretty sure that Tom can feel emotion. Lord knows I can--I get my
feelings hurt pretty easily. Again, this is probably why I felt compelled to
jump in here on something that has essentially no GMC content at all...I've
been there.

As to it being "the same couple of people each time," I made it a point not
to name names, but scan the digests. This is not the first instance. Damn
it, why is it ok for some to criticize another for his presentation, but not
for me to criticize the criticizer? This is tolerance for another's
viewpoint?

In actuality, I hope that what we are doing here is clearing some air and
learning respect for one another. I sincerely hope that I am not
disappointed, and that I am not misinterpreted.

Believe me when I tell you that I have greatest respect and fondness for
each of you. In fact, I will even add that the "couple of people" whom I did
not name are among my favorite posters here. I hope that opposing viewpoints
can be tolerated.

Very best regards, I mean that,

Travis

>
> I have often been the subject of this same phenomenon myself, so maybe I'm
> overly sensitive to it. I sense that Tom, like me, wants to help and is
> probably amazed that a few people get there backs up. I guess I am too.
> Especially when it's the same couple of people each time.
>
> Travis: This is the kind of comment that cuts off dialog - "Especially
when
> it's the same couple of people each time." Paint a corner, put a person
in
> it enough times and he or she will not bother stepping over the line
again.
> You may perceive that Tom's comments were not intimidating or that the
same
> types always complained about it but my guess is that any of the positions
> taken on the net have a number of supporters who do not put in their "two
> bits" because somebody else has voiced their feelings appropriately. As a
> person who has worked with words for 25 years (in the book publishing
> industry), I can assure you that how you choose your words is critical to
> the message. And I quite agree with Patrick, Tom's choice of phrase did
> come across as intimidating. I was going to post something myself but the
> message was well posted by others.
>
> To add a bit of fuel to the fire, my experience is that "engineering
types"
> seem to some of the worst offenders. Perhaps because they are used to
> working with absolutes and therefore don't "suffer fools gladly."
>
> Vic Marks
> Vancouver BC
> 75 transmode
>
>
 
>
>To add a bit of fuel to the fire, my experience is that "engineering types"
>seem to some of the worst offenders. Perhaps because they are used to
>working with absolutes and therefore don't "suffer fools gladly."
>
>Vic Marks
>Vancouver BC
>75 transmode
>

Hey waittaminit there! I'm an engineering type (don't do much of now except
for fun).

There's a common misconception that engineering deals with absolutes. In
some cases it does. In most cases it doesn't. Let me give an example that's
currently close to home:

Say I work at Statpower designing inverters. My job is to design inverters
to meet some set of criteria. Maybe folks think that the design should mean
that the actual product "never fails." Well that isn't possible. All
semiconductors have a failure rate (and an associated failure
distribution). So, somebody really tells me - "design the new inverter to
last 50k power-on-hours with a specific failure rate or distribution,
supplying an average load of x and a maximum sustained load of Y. And,
since we know that soem applicances have high initial loads but much lower
sustained loads, design it so that the inverter will supply this in-rush
current requirement." There's many compromises involved in meeting the
criteria. Utimately if I'm sucessful my design will meet the criteria with
some failure rate.

The bottom line is that when I design it involves compromise and failure
rates. There's precious few absolutes.

What you get from many engineering types is an incomplete absolute
statement. The rest of the statement that's missing is "under the specified
design constraints using accepted engineering practice." Take the case of
tire pressures. The design point for G159 tires on my coach is 75psi per
their chart. But built into that design point is some degree of engineering
tolerance. For some components it might be 2x, for others it might be 10x,
and still others it may be dramatically smaller (closer to no builtin
tolerance). The problem is that the design point is most often chosen to
move the failure curve in the direction of greater reliability (fewer tire
failures per unit time). Of course one can operate their tires at a lower
pressure - it just moves the failure rate to another (and worse) curve. At
some level the pressure will nearly guarantee failure within a small number
of miles.

The engineering safety margin is an institutionalized factor in many
companies. If the "safety factor" is 2x, then from a strictly mechanical
standpoint you could exceed the rating by a factor of 2 and still be within
the absolute tolerance of the part. This is one of the reasons why we see
anecdotal evidence of "better" performance than the manufacturer specifies.
This is true of tires - the tire manufacturer specifies a loading vs
inflation chart based on their testing. The chart intrinsically includes
design goals for failure rates, rolling resitance etc.

I'm not trying to change anyone's mind about inflation pressures. Each of
you can obtain the inflation chart for your specific tires from the
manufacturer (but be certain to let them know that it's for a light truck
tandem axle configuration) and decide for yourselves. DO be aware that if
you ignore the manufacturer's inflation recommendations that you are
lessening reliability. How much? Goodyear told me that a 20% underinflation
relative to their recommendation cuts tire life by 50%. The one thing I
will urge everybody to do is perform a walk-around of your coach every time
you fill up. We've caught many small problems before they got big by doing
this. When I drove trucks in college this procedure saved me from many tire
failures (but didn't eliminate them all).

Henry

Henry Davis Consulting, Inc / new product consulting
PO Box 1270 / product readiness reviews
Soquel, Ca 95073 / IP reviews
ph: (831) 462-5199 / full service marketing
fax: (831) 462-5198
http://www.henry-davis.com/ http://www.henry-davis.com