Call number:
ZSP-201-76/45
In:
CRREL Report, 76-45
Description / Table of Contents:
The maneuverability of air cushion vehicles can become a serious operational problem when the vehicle's travel route is restricted by obstacles, slopes or cross-wind conditions, or when close-quarter turns are required. While improvement and perfection of aerodynamic methods may be a more desirable approach, there is a practical limit to these methods, and the use of ground contact devices requires consideration for providing more positive directional control. Wheels deserve special attention, and therefore are analyzed in more detail because of their obvious application on a variety of land terrains. Brake rods and harrows are more suitable on water, ice and snow. The saucer-shaped ground contact device would cause the least ecological impact on fragile organic terrains such as tundra. Relative directional stability is evaluated in terms of the total yawing moments produced by wheel arrangements (single, dual, tandem), location on the vehicle, and operational modes (free-rolling, braked, or a combination of the two). The available moments are plotted against the yaw angle of the vehicle to determine the most effective operational mode with a particular wheel arrangement for any yaw condition. The analysis is limited to retractable devices which act as moment producing brakes or rollers and do not serve as either propulsion or load support aids. Controlled ground contract with skirt sections having special wearing surfaces may provide a suitable control method and would require the least significant change to the basic design of the vehicle or its components. The concept involves the use of an air flow control mechanism for deflating specific skirt sections.
Type of Medium:
Series available for loan
Pages:
vii, 15 Seiten
,
Illustrationen
Series Statement:
CRREL Report 76-45
URL:
https://hdl.handle.net/11681/9270
Language:
English
Note:
CONTENTS
Abstract
Preface
Nomenclature
Conversion factors: U.S. customary to metric (SI) units of measurement
Section I: Use of auxiliary devices for ACV control
Introduction
Discussion of wheels as a control device
Dual wheels
Single wheel
Tandem wheels
Application to existing ACV’s
Other control devices
Turning force
Conclusions
Section II: Use of flexible skirts for ACV control
Introduction
The flexible skirt as a control device
Model tests
Conclusions
Literature cited
Location:
AWI Archive
Branch Library:
AWI Library
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