Objective To investigate the migrating possibility of Anopheles anthropophagus through observing it s special behavior of homochronous sudden increasing and appearance.

An efficient method is presented to evaluate the rotor transient response to a ramp increase in collective pitch in vertical flight,where the unsteady effects of the blade flap motion and dynamic inflow on rotor thrust are taken into account based on the blade element/momentum theory,which is suitable for analyses of transient variation of rotor thrust,blade flap motion and induced velocity.