Performance Criteria of Pulse-Jet Propellers 



wrong thing. But as in any case a complete definition is provided, no difficulties 

 should arise. 



In order to render this presentation as systematic as necessary in view of 

 the various concepts involved, the corresponding symbols and terms are not in 

 any case in accordance with the ITTC Standard Symbols (1965), which as a col- 

 lection of signs and words rather than a language proper, do not lend themselves 

 readily for systematic work; Schmiechen, 1966.1. 



The aim of this paper, the reconstruction of some concepts of the theory of 

 propulsion in view of a wider application, has been achieved by deduction from 

 the basic principles of hydrodynamics, resulting in consistent sets of perform- 

 ance parameters and criteria for any type of propulsion device, and thus, it is 

 hoped, throwing new light on various problems, even in conventional propulsion. 



The paper does not provide a review of the state-of-the-art concerning 

 pulse-jet propellers and their possible applications elsewhere, but rather some 

 concepts and procedures currently under consideration or applied at the Berlin 

 Towing Tank. 



This work is dedicated to Professor F. Horn. The partial support by the 

 Deutsche Forschungsgemeinschaft, the Fraunhofer Gesellschaft fuer angewandte 

 Forschung, the Max Kade Foundation, and the Massachusetts Institute of Tech- 

 nology is gratefully acknowledged. 



NOTATION . >: i . a- y ■: : . 



The numbers after the definitions are those of the sections wherein the 

 quantity is first mentioned or defined. 



1101 



