3. Answer the following questions by clicking on True or False.
|
a) When the propeller is rotating the pressure above the helicopter is reduced.
|
|
|
|
b) Before the propeller starts rotating, the pressures below and above the helicopter are the same.
|
|
|
|
c) When the propeller is stationary the velocity below the propeller is higher than at the top.
|
|
|
Back