Structural, load-bearing elements for a future extraterrestrial installation are nearly impossible to launch once they exceed a certain length. Beams can be assembled from shorter pieces, but suffer an excessive weight penalty in the form of fasteners. The rigidizable inflatable beams designed in this project will require minimal storage volume and can be produced to nearly any length and size while still fitting in projected launch vehicles. As such they will be an enabling technology for large living spaces on future long-duration flight missions. The primary commercial market for inflatable rigidizable structures is in emergency or semi-permanent installations for military and relief operations. The ability to strengthen these structures with rapidly erectable structural members will greatly enhance wind resistance and the ability to carry overhead loads. With the emergence of inflatable bridge structures the use of rigidizables will be an important step forward to make such structures permanent.