Langley USB transport aircraft of 1973

[hesham]

Hi,

it look like the Boeing USB XC-14 aircraft,but was bigger,and
had four engines.
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740003719_1974003719.pdf

 

[hesham]

Hi,

and more USB;
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750023943_1975023943.pdf