  A rigid object of general shape is fixed inside a wind tunnel. The drag force
exerted on it by the wind is determined by a new method based on simple basic
Physics concepts, provided one has a solver, any solver, for the corresponding
dynamic Navier-Stokes equation which determines the wind velocity field around
the object. The method is completely general, but here we apply it to the
traditional problem of a long cylinder perpendicular to the wind.
