Aerodynamic principles of the direct lifting propeller Page: 3 of 74
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NAT IONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL IMEEORAITDUM 0. 733
AERODYNAMIC PRIhCIPLES OF THE DIRECT LIFTING PROPELLER*
By Martin Schrenk
The purpose of this report is to make the complicated
processes on the direct-lift propeller amenable to analy-
sis and observation. This is accomplished by placing the
physical phenomena, starting with the most elementary proc-
ess, in the foreground, while limiting the mathematics
treatment to the most essential in view of the fundamental
defects of the theorems. Comparison with model experiments
supplements and corroborates the theoretical results.
INTRODUCTION
Among the various rotating airfoil systems,**the auto-
giro, in spite of being the most recent arrival in the se-
ries, has been the first to receive general recognition,
*"Die aerodynamischen Grundlagen der Tragschraube." Z.FM.,
August 14, 1933, pp. 413-419; August 28, 1933, pp. 449-454;
and September 14, 1933, pp. 473-481.
**As to the types of rotary airfoil systems, the following
definitions are used. Any aircraft with rotating airfoils
for producing lift - in contradistinction to aircraft With
"fixed" wing systems - falls into this class. At present
they may be divided into three different categories:
1_ Autoiro: An aircraft having one or more systems of
airfoils rotating substantially about a vertical axis; that
is, the air flows upward through the propellor disk.
2_f fclcter: An aircraft having one or more sets of air-
foils essentially rotating about a vertical axis but driven
from the aircraft; that is, the air passes downward through
the propeller disk.
3) Cyclogiro (name coined by Dr. Reohrbach): An aircraft
having substantially a system of airfoils rotating, about
a horizontal axis, which can be made to rotate freely in
the relative wind or be driven from the aircraft.
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Schrenk, Martin. Aerodynamic principles of the direct lifting propeller, report, January 1934; (https://digital.library.unt.edu/ark:/67531/metadc63503/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.