The helicopter is a type of aircraft which is lifted and propelled by one or more sets of horizontally revolving overhead rotors.  It has two rotors that spin several blades. A blade is a tilted airfoil, just like an airplane wing. As it speeds through the air, each blade generates …

Hypersonic refers to aircraft, missiles, rockets, and spacecraft that can reach atmospheric speeds in excess of Mach 5, which is almost 4,000 miles per hour or 6,125 kilometers per hour or more. Hypersonic flight is flight through the atmosphere below about 90 km at speeds greater than Mach 5, a …

This is the age of multidisciplinary frontiers in science and technology where major breakthroughs are likely to occur at the interfaces of disciplines.   Light has always fascinated mankind and since the beginning of recorded history, it has been both a subject of research and a tool for the investigation …