Photogrammetric Trajectory Estimation of Foam Debris Ejected from an F-15 Aircraft

by Mark S. Smith

Photogrammetric analysis of high-speed digital video data was performed to estimate trajectories of foam debris ejected from an F-15B aircraft. This work was part of a flight test effort to study the transport properties of insulating foam shed by the Space Shuttle external tank during ascent. The conical frustum-shaped pieces of debris, called "divots," were ejected from a flight test fixture mounted underneath the F-15B aircraft. Two onboard cameras gathered digital video data at two thousand frames per second. Time histories of divot positions were determined from the videos post flight using standard photogrammetry techniques. Divot velocities were estimated by differentiating these positions with respect to time. Time histories of divot rotations were estimated using four points on the divot face. Estimated divot position, rotation, and Mach number for selected cases are presented. Uncertainty in the results is discussed.

32 pages, Paperback

Published July 23, 2013

About the author

Mark S. Smith is Skirball Professor of Bible and Ancient Near Eastern Studies at New York University. He has served as visiting professor at the University of Pennsylvania, the Hebrew University in Jerusalem, and the Pontifical Biblical Institute in Rome. Smith was elected vice president of the Catholic Biblical Association in 2009.