Posted by Brendon-KS on September 18, 2020 at 10:55:12 from (206.225.246.20):
In Reply to: Lucky to survive-wreck posted by Mech Inclined on September 18, 2020 at 09:31:56:
The cargo securement standards are to ensure that loads do not shift or come loose during normal driving which does include emergency maneuvers like hitting the brakes and swerving. In the forward direction the securement must be rated for at least a .8 G load with the side and rearward being .5 G, both of which are reasonable for what a truck can physically do during emergency maneuvers. However, during an accident the deceleration can easily be in the 20+ G range which means that even a small 5000 lb load could be generating 100,000 lb of force against its restraints. From a practical standpoint there is simply no way to secure something with the mass of a tractor well enough to guarantee that it will never come off the truck or trailer during any kind of crash - the physics just don't allow it. The rules are there to prevent shifting or lost cargo from causing an accident in the first place but once an accident is already taking place there will be a limit as to what the securement can withstand.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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