Dynamic Response Analysis of Direction Control for SemiDifferential CoAxial Helicopter

The dynamic equation of a semi-differential co-axial helicopter in vertical flight was set up and solved based on classical vortex theory and character of aerodynamic interference between upper and lower rotors of the co-axial helicopter. There exists a coupling relationship between vertical movement and direction rotation with direction control in vertical flight of the helicopter. Calculation example results indicate that the equations of dynamic response proposed for vertical movement and direction rotation reflect flight character of this helicopter.