Accession Number:

ADA045315

Title:

Aerodynamics and Hovering Control of LTA Vehicles

Descriptive Note:

Final rept.

Corporate Author:

PRINCETON UNIV NJ DEPT OF AEROSPACE AND MECHANICAL SCIENCES

Report Date:

1977-05-01

Pagination or Media Count:

155.0

Abstract:

Recent U.S. Navy interest in air vehicles for application to advanced naval missions has pointed out a need for technology development in certain areas to support parametric and point design studies in the Advanced Naval Vehicle Concepts Evaluation ANVCE program. Among those technologies requiring study were the aerodynamics and precision hover control characteristics of Lighter-Than-Air LTA vehicles. LTA, or buoyant assisted lift, vehicles offer potentially significant increases in on-station endurance over conventional aircraft. To evaluate fully this potential, however, it is important to have a sound aerodynamic description of these aircraft that can be relied upon to give accurate representations of their performance, stability and control requirements. The present study is intended to provide a basis for the aerodynamic characterization of LTA vehicles suited to parametric studies, point design and even preliminary design efforts. The study employs combinations of applicable theory, experiment and empiricisms to represent the aerodynamic characteristics of conventional airship body-of-revolution and delta shapes, the latter shape having applicability to hybrid aircraft utilizing both aerodynamic and aerostatic lift. Additionally, the potential of boundary layer control for drag reduction in conventional airships is reviewed and the basic aspects of hovering control of LTA vehicles are developed. Author

Subject Categories:

  • Lighter-than-air Aircraft
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE