RVCQ3D (Rotor Viscous Code Quasi-3-D) is a computer code for analyzing inviscid and viscous blade-to-blade flows in turbomachinery. It includes the quasi-3-D effects of rotation, radius change, and variable stream surface thickness. Simple flat plate and duct geometries can also be analyzed. RVCQ3D solves the Euler or Navier-Stokes equations written on a surface of revolution. The equations are written in an (m,theta)coordinate system, where m is the arc length along the surface and theta is the circumferential direction. The stream surface radius and thickness are assumed to be known functions of m, and are usually obtained from an axisymmetric throughflow analysis