“This collection represents the current state-of-the-art in combustion research for air-breathing chemical propulsion. Nearly an equal mix of computational and experimental results are presented from the major players in Pulse Detonation Engines research, providing the reader with a thorough overview of the contemporary technical issues remaining to be resolved in this promising hypersonic air-breathing propulsion technology. —W.L. Roberts and T. D. Scharton, Department of Mechanical & Aerospace Engineering, North Carolina State University, NC, USA