The helicopter shown in the figure below has a mass of 12 tonsand it needs to rotate its 14 meter blades (diameter of the blades= 14 meters) at 670 rpm just to hover (stand still in mid air)without any additional load. The air flow caused by the rotation ofthe helicopter blades may be modeled as a moving cylindrical bodyof air having a 14 meter diameter. The average velocity of theairflow of that cylindrical air-body is proportional to therotational speed of the helicopter blades (RPM).
Determine the airflow rate when the helicopter hovers and the powerthat its engines produce.
If the helicopter is now loaded with an 8 tons load as shown in thefigure. Determine again the airflow rate when the helicopter hoversand the power that its engines produce.
