MARTIN MARIETTA X-24B CONTRACTOR'S MODEL. Mixed material on wood base, Southwick Models, c.1973, wingspan 5 3/4 inches, fuselage 10 3/4 inches, 6 inches tall, the base bearing three plaques: 'Flight Mechanics Div A FFDL,' [AFFDL insignia], and 'Research Vehicle X-24B.' The X-24 was an experimental aircraft developed under the joint U.S. Air Force-NASA PILOT program, designed and built to test lifting body concepts and experiment with the concept of unpowered reentry and landing, which was later used by the Space Shuttle. The aircraft was originally built as the X-24A, but rebuilt and modified with a rounded top, a flat bottom and a double delta platform leading to a pointed nose, and was redesignated the X-24B. For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing