Re: Automatic seat belts do not protect

Mike answered my non-troll post:


I seldom reply to my crtics, but in this case, Mike's sincere intuition
appears reasonable on first sight, but is deeply flawed and deserves to be
corrected in the interest of truth:

1.  Complete research is impossible. Unlike aircraft center of gravity
specs are not published or even available from shop manuals or direct
inquiry from the manufacturers. Try to find this all important spec
yourself for all rollover calculations. (Old) Chrysler Corp. answered an
inquiry with "We don't know the c.g. of our cars" (! )  (exclamation mine)
2.  Rollover tests are conducted by manufacturers at the lowest possible
c.g. configuration: Light driver, no passengers, full gas tank, no cargo,
no roof load (SUVs, station wagons with roof rack). Level, smooth, dry
macadam roads are supposed to be used, but who is to say the test road
isn't sanded. Vehicles that barely pass when tested as described will
surely roll on maximum turns at high speed when fully loaded and with
minimum gas. These are the real world conditions in accident avoidence
manuevers.
3.  No tipping to 45 degrees necessary or has any bearing whatsoever on
this issue! A top heavy SUV or Pickup will roll from 0 degrees (level): An
overturning moment acting at the c.g. due to force generated by dynamic
centrifugal force, if speed is sufficient, the resultant centrifugal force
exceeds the available centrepital resistance at the c.g. and  cause a
vehicle to roll from 0 to 90 and possibly to 360 degrees or more in an
instant. Modern SUVs and pickups are placarded on their sunvisors with
rollover warnings.
4.  As for the big rigs, they are very susceptable to rollover, crically so
when fully laden. Their drivers know this and are very careful not to
corner hard, except at reduced speeds. All of us have seen the reduced
speed roadside signs showing the symbol of of a tipping big rig. Typically
a sign will have a 45 mph limit where a skilled car driver could take the
curve at 75 or better, limited not by rollover, but road friction, if
exceeded causes not rollover but directional control loss.

Yes, you are correct. Strike a curb or get tripped in a ditch at sufficient
speed and anything will roll. Do I still strike you as a troll, or do I
sound more like a knowledgeable person who tries to explain the physics
without the complicated math needed to prove my statements scientifically,
beyond rebute?





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