Posted by MarkB_MI on July 16, 2016 at 06:19:45 from (70.194.0.244):
In Reply to: DOT?? posted by Geo-TH,In on July 16, 2016 at 05:16:55:
George,
Remember that your cargo probably isn't sitting on ball bearings. Most items you're going to carry will withstand a certain G force without any straps or chains. So the tiedown doesn't have to withstand the full force of acceleration, just whatever force is needed in addition to the static friction of the load on the trailer.
Note also that as the tiedowns are secured, their tension increases the downward force of the load against the trailer, which increases the friction between load and trailer. If, for example, the tiedown is under 200 lbs of tension and is at 45 degree angle from verticle, it's going to add 141 pounds of downward force to the load.
That said, I don't think you can tie a load down too well. I remember seeing a car on the side of a Detroit freeway with everything smashed ahead of the firewall. Apparently the car was following a semi with an enclosed trailer, the driver probably unaware that the trailer was loaded will coils of sheet metal. One of those coils broke free and came right through the trailer doors, demolishing the car. The driver appeared to be very shaken but unhurt.
And in North Caroling I saw a brand-new 23' Mako center console sportfisherman loaded into the bed of a brand-new Ford pickup. Apparently the new boat owner didn't bother to buy a 30 dollar tiedown strap to keep his 20 thousand dollar boat from launching out of its trailer and into the back of his 20 thousand dollar pickup truck. One hard stop was all it took.
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