Researchers often compare efficiency by referring to the highest rotor speed, but this can be misleading because other factors such as temperature or geometry of the tube contribute to the performance ...

Industrial fans are required for many power plants to operate, such as primary and secondary air fans, and induced draft fans. Understanding rotor dynamics is essential for reliable long-term fan ...

Click to open image viewer. CC0 Usage Conditions ApplyClick for more information. In 1944, at the age of 19, Stanley Hiller, Jr. designed, built, and test flew the first helicopter with coaxial rotors ...