This book is a collection of the design reports submitted by participating teams in the 4th, 5th and 6th National Design, Build and Fly Competitions in 2009, 2010 and 2011 respectively organized by Ghulam Ishaq Khan Institute of Engineering Sciences and Technology's Student Chapter of AIAA (American Institute of Aeronautics and Astronautics) and Higher Education Commission(HEC), Pakistan. The participating teams secured 1st Position in IC-Engine powered Category of the Competition in 2009, 2nd Position in 2010 and won Special Prize in 2011.Moreover, the TEAMS were highly regarded for the...