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National Advisory Committee for Aeronautics, Report - Applications of Modern Hydrodynamics to Aeronautics

I have been requested by the United States National Advisory Committee for Aeronautic
to prepare for the reports of the committee a detailed treatise on the present condition of those
applications of hydrodynamics which lead to the calculation of the forces acting on airplane
wings and airship bodies. I have acceded to the request of the National Advisory Committee
all the more willingly because the theories in question have at this time-reached a certain con-
clusion where it is worth while to show in a comprehensive manner the leading ideas and the
results of these theories and to indicate what confirmation the theoretical results have received
by tests. '

The report will give in a rather brief Part I an introduction to hydrodynamics which is
designed to give those who haveinot yet been actively concerned with this science such a grasp
of the theoretical underlying principles that they can follow the subsequent developments.
In Part II follow then separate discussions of the different questions to be considered, in which
the theory of aerofoils claims the greatest portion of the space. 'The last part is devoted to
the application of the aerofoil theory to screw propellers.

At the express wish of the National Advisory Committee for Aeronautics I have used the
same symbols in my formulae as in my papers written in German. These are already for the
most part known by readers of the Technische Beriohte. A table giving the most important
quantities is at the end of the report. A short reference list of the literature on the subject
and also a table of contents are added.