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Effect of the Ground on an Airplane Flying Close to It
In America and England the ground effect has received much attention for a long time, and whole series of model and flight tests have been made, which have, however, been chiefly devoted to changes in the induced drag. The experiments here described show that the increase in lift may be of high enough order of magnitude to be taken into account also.
Date:
June 1932
Creator:
Tönnies, E
System:
The UNT Digital Library
Vertical Descent of the Autogiro
The purpose of this report is to show that only part of the system of rotating blades really is in the "windmill decelerating attitude" when the profile drag is sufficiently low. This particular part receives more torque from the air loads than can be absorbed by the profile drag. As a result thereof the rotating autogiro blade, when its torque is zero, is in part a propeller which functions in the "annular vortex attitude.".
Date:
June 1932
Creator:
Bennett, J. A.
System:
The UNT Digital Library