Quote:
Originally Posted by gbaglo
Wouldn't the accuracy of the scale also come into the equation? Some may be +/- 10 kg. Some may be +/- 50 lbs. ?
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True. These scales are calibrated to be accurate to within the display precision, which is in steps of 10 kilograms (and typically 20 pounds in the U.S.), so all readings are +/- 5 kg. Sums and differences of multiple readings accumulate errors, but a substantial component of error is typically systematic (rather than random) so they self-cancel to some extent in these calculations.
So nothing is without error, but any calculations based on a number which has been converted incorrectly (probably just due to a typo while transcribing values into a conversion tool) are certainly wrong.
I wouldn't bother posting about this, given that this discussion was wrapped up long ago, except that people do search for information and find it in older threads, so the error gets repeated.
In this case they typo made the pin weight fraction appear to 17.9% (although it is not as precise as that suggests), when it should have been 15.6%. That's enough difference to be significant to another discussion.
The incorrect values appear to be an entry in Jon's Trailer Weights in the Real World spreadsheet (the line with a 728 pound pin weight).
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