1. Vertical Takeoff Vertical Landing Spacecraft Trajectory Optimization via Direct Collocation and Nonlinear Programming Open Access Author: Policelli, Michael J Title: Vertical Takeoff Vertical Landing Spacecraft Trajectory Optimization via Direct Collocation and Nonlinear Programming Graduate Program: Aerospace Engineering Keywords: DirectCollocationNonlinear ProgrammingVerticalTakeoffLandingVTVLmoonlunartrajectoryoptimizationspacecraft File: Download 2014_Policelli_M.S._Thesis_Final_Version__August_3_.pdf Committee Members: Dr David Spencer, Thesis Advisor/Co-Advisor