I know why don't you find answers to your questions in the 9/11 Commission Report or the NIST Report or the FBI Report or any number of govie "reports".I don't know who judged my last post "nuts"...., but YOU can chew on these nuts.......
An 8'x8' jet turbine is likely circular in design rather than square so if you wanted to estimate the surface area you would use the Pi formula......reducing the surface area estimate from 64 sq ft to 50 1/4 sq ft, or 22% less surface area if you will. That is significant and way outside the boundaries of tolerances I deal with which are set by professional engineers, that's nearly twice the factor of safety calculated into structural concrete in building designs.
The information about the planes, angle of deflection at impact, air speed from flight data, etc, etc, along with the design of the pentagon walls(thickness, reinforcing, design strength, etc) along with testing and inspection data can be used to run a "scientific" mathematical calculation to determine whether or not A(plane) caused B(damage to pentagon), I haven't seen anyone even attempt to seriously answer that question.
Now that would certainly answer some questions, but where is it???
NIST's fall guy Dr. Zdenek Bazant has got some nifty "scientific" mathematical calculations. You could look them up and maybe that would help you in your calculations.
Actually the answer to your last question answers it best.
"But where is it?"
The answer is it isn't because it never was.