An experimental and numerical investigation on a four-blade isolated main rotor in hover condition has been carried out in order to investigate the effect of the rotor downwash on a tethered load. A sling load was located ...

Autorotation to landing is a difficult manoeuvre to accomplish successfully in an emergency. During autorotation, it is critical to simultaneously maintain the desired flight path, decelerate the aircraft appropriately, ...

Differential infrared thermography (DIT) is a method of analyzing infrared images to measure the unsteady motion of the laminar�turbulent transition of a boundary layer. It uses the subtraction of two infrared images taken ...

A compound helicopter is defined as a helicopter with an auxiliary propulsion system which provides thrust in excess of that which the rotor(s) alone could produce, thereby permitting increased forward speeds; wings are ...

Time-accurate numerical predictions of the interactional aerodynamics between NASA�s generic ROBIN fuselage and its four-bladed rotor were performed using the recently developed RANS solver HAMSTR. The fifth-order WENO ...

The US Department of Defense has established an initiative to develop a family of next-generation vertical lift aircraft that will fly farther, faster, and more efficiently than the current fleet of rotorcraft. To accomplish ...

During the past few years, different concepts of fast rotorcraft have appeared. Most of them rely on additional propellers (usually one or two of them) to ensure the propulsive force at high speed in order to be able to ...

Helicopter military missions such as combat search and rescue, medical evacuation and landing on unprepared sites can involve operating in hostile, low-altitude, and degraded visual environments (DVE). These conditions may ...

This work presents the comparison between experimental measurements and numerical simulations concerning the flowfield generated by a helicopter rotor operating in ground effect conditions above an inclined plane. Specifically, ...

Rotorcraft engines are subject to significant damage whilst operating in brownout conditions due to the ingestion of mineral particulates. The high pressure turbine is particularly at risk due to the deposition of molten ...