Author: H. Hoene
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Influence of Static Longitudinal Stability on the Behaviour of Airplanes in Gusts
Influence of Static Longitudinal Stability on the Behavior of Airplanes in Gusts
Author: H. Hoene
Publisher:
ISBN:
Category : Equations of motion
Languages : en
Pages : 740
Book Description
The equations of motion for an airplane penetrating a gust are derived using a few simplifying assumptions. Calculations of loads for different static longitudinal stability on two German airplane models, HC 45 and HS 122, are compared with flight tests. Good agreement is obtained between the trend of the flight tests and the calculated values; however no absolute comparison was possible between the flight tests and calculations.
Publisher:
ISBN:
Category : Equations of motion
Languages : en
Pages : 740
Book Description
The equations of motion for an airplane penetrating a gust are derived using a few simplifying assumptions. Calculations of loads for different static longitudinal stability on two German airplane models, HC 45 and HS 122, are compared with flight tests. Good agreement is obtained between the trend of the flight tests and the calculated values; however no absolute comparison was possible between the flight tests and calculations.
An Analysis of the Effects of Aeroelasticity on Static Longitudinal Stability and Control of a Swept-back-wing Airplane
Author: Richard B. Skoog
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 50
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 50
Book Description
The Effects of Static Margin and Rotational Damping in Pitch on the Longitudinal Stability Characteristics of an Airplane as Determined by Tests of a Model in the NACA Free-flight Tunnel
Author: John P. Campbell
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 26
Book Description
Summary: The effects of static margin and rotational damping in pitch on the longitudinal stability characteristics of an airplane have been determined by flight tests of a model in the NACA free-flight tunnel. In the investigation, the rotational damping in pitch was varied over a wide range by using horizontal tails that varied in area from 0 to 24 percent of the wing area. A range of static margins from 2 to 16 percent of the mean aerodynamic chord was covered in the tests. For each test condition the model was flown and the longitudinal steadiness characteristics were noted. It was found in the investigation that longitudinal steadiness was affected to a much greater extent by changes in static margin than by changes in rotational damping. The best longitudinal steadiness was noted at large values of static margin. For all values of rotational damping, the steadiness of the model decreased as the static margin was reduced. The model was especially unsteady at low values of static margin (0.03 or less). Reduction in rotational damping had little effect on longitudinal steadiness, except that with low values of static margin (0.03 or less) the longitudinal divergences were sometimes more violent with the tailless (low rotational damping) condition.
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 26
Book Description
Summary: The effects of static margin and rotational damping in pitch on the longitudinal stability characteristics of an airplane have been determined by flight tests of a model in the NACA free-flight tunnel. In the investigation, the rotational damping in pitch was varied over a wide range by using horizontal tails that varied in area from 0 to 24 percent of the wing area. A range of static margins from 2 to 16 percent of the mean aerodynamic chord was covered in the tests. For each test condition the model was flown and the longitudinal steadiness characteristics were noted. It was found in the investigation that longitudinal steadiness was affected to a much greater extent by changes in static margin than by changes in rotational damping. The best longitudinal steadiness was noted at large values of static margin. For all values of rotational damping, the steadiness of the model decreased as the static margin was reduced. The model was especially unsteady at low values of static margin (0.03 or less). Reduction in rotational damping had little effect on longitudinal steadiness, except that with low values of static margin (0.03 or less) the longitudinal divergences were sometimes more violent with the tailless (low rotational damping) condition.
An Analysis of the Effects of Aeroelasticity on Static Longitudinal Stability and Control of a Swept Wing Airplane
Notes on the Static Longitudinal Stability and Control of Aircraft
Author: Waldemar Otto Brehaus
Publisher:
ISBN:
Category : Stability of airplanes
Languages : en
Pages : 78
Book Description
Publisher:
ISBN:
Category : Stability of airplanes
Languages : en
Pages : 78
Book Description
The Effects of External Stores on the Longitudinal Static Stability of Aircraft
Author: Edgar W. Lorson
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
Book Description
BOMB RACKS, CONFIGURATIONStudies were made of experimental data to determine the effects of various external store characteristics, spanwise positions, and Mach number on the static longitudinal stability of various aircraft. Data used included results of wind tunnel tests run at the USAF Academy as well as tests run at the Arnold Engineering Development Center, the Naval Ship Research and Development Center and Breguet Aviation. External store characteristics considered were store frontal area, volume, and side projected area. The correlation between any of the three characteristics and change in static margin was approximately the same. Loss in static margin tended to increase to a maximum at moderate values of frontal area, volume, or side projected area and then to decrease for higher values. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
Book Description
BOMB RACKS, CONFIGURATIONStudies were made of experimental data to determine the effects of various external store characteristics, spanwise positions, and Mach number on the static longitudinal stability of various aircraft. Data used included results of wind tunnel tests run at the USAF Academy as well as tests run at the Arnold Engineering Development Center, the Naval Ship Research and Development Center and Breguet Aviation. External store characteristics considered were store frontal area, volume, and side projected area. The correlation between any of the three characteristics and change in static margin was approximately the same. Loss in static margin tended to increase to a maximum at moderate values of frontal area, volume, or side projected area and then to decrease for higher values. (Author).
Definition and Application of Longitudinal Stability Derivatives for Elastic Airplanes
Author: William B. Kemp
Publisher:
ISBN:
Category : Aeroelasticity
Languages : en
Pages : 132
Book Description
A set of longitudinal stability derivatives for elastic airplanes is defined from fundamental principles allowing perturbations in forward speed. Application of these derivatives to longitudinal stability analysis by use of approximate expressions for static stability and control parameters as well as the dynamic equations of motion is illustrated. One commonly used alternative formulation for elastic airplanes is shown to yield significant inaccuracies because of inappropriate interpretation of inertial effects.
Publisher:
ISBN:
Category : Aeroelasticity
Languages : en
Pages : 132
Book Description
A set of longitudinal stability derivatives for elastic airplanes is defined from fundamental principles allowing perturbations in forward speed. Application of these derivatives to longitudinal stability analysis by use of approximate expressions for static stability and control parameters as well as the dynamic equations of motion is illustrated. One commonly used alternative formulation for elastic airplanes is shown to yield significant inaccuracies because of inappropriate interpretation of inertial effects.
Compressibility Effects on the Longitudinal Stability and Control of a Pursuit-type Airplane as Measured in Flight
Author: William N. Turner
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 72
Book Description
Measurements of the longitudinal stability and control of a pursuit-type airplane (the P-39N-1 airplane) were made in flight up to a Mach number of 0.78. The data are presented in the form of curves showing the variation, with center-of-gravity position, dynamic pressure, and Mach number, of the stick-fixed and stick-free stability, control, and balance of the airplane.
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 72
Book Description
Measurements of the longitudinal stability and control of a pursuit-type airplane (the P-39N-1 airplane) were made in flight up to a Mach number of 0.78. The data are presented in the form of curves showing the variation, with center-of-gravity position, dynamic pressure, and Mach number, of the stick-fixed and stick-free stability, control, and balance of the airplane.
Flight Stability and Automatic Control
Author: Robert C. Nelson
Publisher: WCB/McGraw-Hill
ISBN: 9780071158381
Category : Aerodynamique / Aeronautique / Aerospatial / Automatique / Avion / Commande / Conception / Controle / Navigation / Stabilite
Languages : en
Pages : 441
Book Description
The second edition of Flight Stability and Automatic Control presents an organized introduction to the useful and relevant topics necessary for a flight stability and controls course. Not only is this text presented at the appropriate mathematical level, it also features standard terminology and nomenclature, along with expanded coverage of classical control theory, autopilot designs, and modern control theory. Through the use of extensive examples, problems, and historical notes, author Robert Nelson develops a concise and vital text for aircraft flight stability and control or flight dynamics courses.
Publisher: WCB/McGraw-Hill
ISBN: 9780071158381
Category : Aerodynamique / Aeronautique / Aerospatial / Automatique / Avion / Commande / Conception / Controle / Navigation / Stabilite
Languages : en
Pages : 441
Book Description
The second edition of Flight Stability and Automatic Control presents an organized introduction to the useful and relevant topics necessary for a flight stability and controls course. Not only is this text presented at the appropriate mathematical level, it also features standard terminology and nomenclature, along with expanded coverage of classical control theory, autopilot designs, and modern control theory. Through the use of extensive examples, problems, and historical notes, author Robert Nelson develops a concise and vital text for aircraft flight stability and control or flight dynamics courses.