"Teacherjh" wrote in message
...
If there's a W&B to be done, it will be ME that does it. I mever nake
mistakes.

Ne either. Oh, I think I found your "n". Want to trade?

The funny thing about this whole problem is that it ignores the fact that
you need not the combined weights for all three passengers, but the combined
weights of two of them (sitting in the rear seat) and the weight of the
front passenger (added to your own, of course).

It's a nice "brain teaser", but it has no practical application, at least
not with the solutions given so far.

One theoretically accurate solution would be to load up the airplane, then
measure the area of the contact patches of each tire. By dividing the area
by the tire pressure (making sure the units match, of course...for example,
measuring area in square inches, and pressure in psi), you get the
distribution of the weight at each tire, which gives you not only total
aircraft weight, but also enough information to calculate a moment, to which
you can include your own weight and position (since I'm assuming the pilot
is not in the plane, but rather is the one taking measurements), and
determine the exact location of the CG.

Of course, there's no really practical way to measure the area of the
contact patch, what with it not being exactly rectangular, there being voids
where the tread has gaps, and the like. But unlike the "add 'em all up"
solution, at least this one has the potential to actually give useful
information, if only the impracticalities could be addressed.

Pete