Author: Marvin P. FinkPublisher:
ISBN:
Category :
Languages : en
Pages : 44
Book Description
Aerodynamic Characteristics of Low-aspect-ratio Wings in Close Proximity to the Ground
Author: Marvin P. FinkPublisher:
ISBN:
Category :
Languages : en
Pages : 44
Book Description
Powered Low-aspect-ratio Wing In Ground Effect (WIG) Aerodynamic Characteristics
Author: James L. ThomasPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 56
Book Description
Low Aspect Ratio Wing in Ground Effect
Author: Mohd. Fazli Mohd. AzmiPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 99
Book Description
Flight Evaluation of Ground Effect on Several Low-aspect-ratio Airplanes
Author: Paul A. BakerPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 52
Book Description
A constant-angle-of-attack-approach technique was used to measure ground effect on several low -aspect-ratio aircraft. The flight results were compared with results from constant -altitude flybys, wind-tunnel studies, and theoretical prediction data. It was found that the constantangle-of-attack technique provided data that were consistent with data obtained from constant-altitude flybys and required fewer runs to obtain the same amount of data. The test results from an F5D-1 airplane modified with an ogee wing, a prototype F5D-1 airplane, two XB-70 airplanes, and an F-104A airplane indicate that theory and wind-tunnel results adequately predict the trends caused by ground effect as a function of height and aspect ratio. However, the magnitude of these predictions did not always agree with the flightmeasured results. In addition, there was consistent evidence that the aircraft encountered ground effect at a height above one wing span.
Flight-measured Ground Effect on a Low-aspect-ratio Ogee Wing Including a Comparison with Wind-tunnel Results
Author: L. Stewart RollsPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 34
Book Description
Aerodynamic Characteristics of Low-aspect-ratio Wings in Close Proximity to the Ground
Author: Marvin P. FinkPublisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
A wind-tunnel investigation has been conducted to determine the effect of ground proximity on the aerodynamic characteristics of thick highly cambered rectangular wings with aspect ratios of 1, 2, 4, and 6. The results showed that, for these aspect ratios, as the ground was approached all wings experienced increases in lift-curve slope and reductions in induced drag which resulted in increases in lift-drag ratio. Although an increase in lift-curve slope was obtained for all aspect ratios as the ground was approached, the lift coefficient at an angle of attack of 0 degrees for any given aspect ratio remained nearly constant. The experimental results were in general agreement with Wieselsberger's ground-effect theory. As the wings approached the ground, there was an increase in static longitudinal stability at positive angles of attack. When operating in ground effect, all the wings had stability of height at positive angles of attack and instability of height at negative angles of attack. Wing-tip fairings on the wings with aspect ratios of 1 and 2 produced small increases in lift-drag ratio in ground effect. (Author).
Ground Effects Related to Landing of Airplanes with Low-aspect-ratio Wings
Author: William B. KempPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 18
Book Description
Investigation of the Static Lift Capability of a Low-aspect-ratio Wing Operating in a Powered Ground-effect Mode
Author: Jarrett K. HuffmanPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 40
Book Description
Measurements of Ground Effect on a Low-aspect-ratio Ogee-wing Airplane Model and Calculations of Landing-flare Trajectories
Author: Vernard E. LockwoodPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 42
Book Description
Aerodynamics of a Lifting System in Extreme Ground Effect
Author: Kirill V. RozhdestvenskyPublisher: Springer Science & Business Media
ISBN: 3662042401
Category : Technology & Engineering
Languages : en
Pages : 358
Book Description
This book is dedicated to the memory of a distinguished Russian engineer, Rostislav E. Alexeyev, who was the first in the world to develop the largest ground effect machine - Ekranoplan. One of Alexeyev's design concepts with the aerodynamic configuration of a jlying wing can be seen on the front page. The book presents a description of a mathematical model of flow past a lifting system, performing steady and unsteady motions in close proximity to the underlying solid surface (ground). This case is interesting for practical purposes because both the aerodynamic and the economic efficiency of the system near the ground are most pronounced. Use of the method of matched asymptotic expansions enables closed form solutions for the aerodynamic characteristics of the wings-in-ground effect. These can be used for design, identification, and processing of experimental data in the course of developing ground effect vehicles. The term extreme ground effect, widely used through out the book, is associated with very small relative ground clearances of the order of 10% or less. The theory of a lifting surface, moving in immediate proximity to the ground, represents one of the few limiting cases that can be treated analytically. The author would like to acknowledge that this work has been influenced by the ideas of Professor Sheila E. Widnall, who was the first to apply the matched asymptotics techniques to treat lifting flows with the ground effect. Saint Petersburg, Russia February 2000 Kirill V. Rozhdestvensky Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
