Before the publication of the results of my original work connected with experimental researches in the Laboratory of the Polytechnical Institute of Warsaw (where I had the help of Prof. Huber and the collaboration of Mr. Kurowski and Mr. Maksymowicz), I want to give here some reproduction of the paper of Mr. W. F. Kisielew in “ Technica Vozdushnogo Flota,” No. 1, 1936, on the design of multispar wings. The results obtained here are very different from those obtained in the above article.

The methods of calculation of the stresses are well-known for monospar and two-spar cantilever wings (compare series of articles in the Reports of I.B.T.L.— Institute of Research for Aeronautics in Warsaw), but present-day methods of construction require more and more attention to be paid to multispar wings as described in this paper.