Abstract A rapid method of obtaining trajectory information for preliminary design purposes is presented in graphic form. The effects of thrust variation with altitude and drag can be approximated by a simple iterative solution. By use of the curves data may be obtained for velocity, path angle, altitude and range covered during powered flight. Curves have been obtained for gravity turn flights and constant attitude flight paths, wherein the thrust vector angle remains constant relative to the local horizontal. The use of these curves is illustrated for a ballistic missile range calculation.