In the absence of a rational theory to predict all aspects of the base drag problem of projectiles and other bodies and the influence of base injection on base drag, a number of semi-empirical correlations have been developed based upon various models of the base flow phenomena to gain an understanding of the experimental results. Several theoretical models are also available which analyze in detail one or more aspects of the base flow phenomena. This report presents a bibliography on the subject of base flows and some of the models and correlations attempted to explain the different aspects of such flows. It is clear that further systematic experimental studies are required if a general analytical model is to be developed even for particular classes of projectiles with injection.Chapter