маховий вертикальний рух лопатей
flapping hinge
flapping stop
blade flapping (the vertical movement in its plane of rotation because of differences in lift between the advancing and retreating blades)
flapping angle
flapping wing
flapping wing aircraft
flapping wing micro air vehicle
gimbal flapping
insect-like flapping wing
smart flapping wing-equipped micro air vehicle
flapping hinge offset
moment of inertia about flapping hinge