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In the past, the computation of aircraft spin conditions required the use of a six degree of freedom program. In this paper a simple procedure was developed by using approximations for predicting spin values. This method required only one force (normal) and one moment (spin about the vertical axis). A simple algebraic equation was derived for the spinning moment in which the roots produced the spin conditions. Three fighter aircraft were analyzed and two stable equilibrium spin points were determined for each aircraft (flat and steep). Comparison with results of previous six degree of freedom analysis showed good agreement with this simple procedure.
In the past, the computation of aircraft spin conditions required the use of a six degree of freedom program. In this paper a simple procedure was developed by using approximations for predicting spin values. This method required only one force (normal) and one moment (spin about the vertical axis). A simple algebraic equation was derived for the spinning moment in which the roots produced the spin conditions. Three fighter aircraft were analyzed and two stable equilibrium spin points were determined for each aircraft (flat and steep). Comparison with results of previous six degree of freedom analysis showed good agreement with this simple procedure.
Author : Michael Charles Love Publisher : McGraw Hill Professional Page : 270 pages File Size : 18,68 MB Release : 1997 Category : Business & Economics ISBN : 9780070388093
Learn to avoid stalls and spins, the #1 cause of general aviation accidents Most pilots learn the basics of stall recovery during their private pilot training. But uncontrolled stalls and spins still plague pilots each year, resulting in unnecessary accidents and injuries. This book gives a clear and concise presentation of not only stall and spin recovery, but more importantly, stall and spin avoidance. Planned stalls or spins are rarely the cause of accidents. It's when pilots fail to notice the warning signs of an imminent unplanned stall or spin that problems occur. These mistakes are normally associated with takeoffs and landings. But accidents can be avoided if pilots learn to recognize the warning signs that indicate that a stall or spin is about to take place. This book teaches pilots to pick up on these warning signals--and discusses many of the improper piloting techniques that cause them. You'll learn how to: Avoid slipping and skidding turns that may lead to stalls and spins; Recognize and deal with a variety of stall/spin situations that require different recovery techniques; Effect spin recovery in true emergency situations; Orchestrate control imputs for spin recovery; Spot the warning signals of an imminent stall; Make the crucial distinction between a spin and a spiral; Avoid or recover from inverted and crossover spins; Avoid secondary stalls. This book gives you in-depth understanding of stall and spin situations, including many exotic spins that most pilots never encounter--but critical knowledge for those who do meet them. This information in conjunction with the ability to recognize and avoid inadvertent stalls, taught by this book, can help you be a safer, more competent pilot.
A summary was made of all NASA (and NACA) research and experience related to the spin and recovery characteristics of light personal-owner-type general-aviation airplanes. Very little of the research deals with light general-aviation airplanes as such, but many of the airplanes and models tested before and during World War II were similar to present-day light general-aviation airplanes with regard to the factors that are important in spinning. The material is based mainly on the results of spin-tunnel tests of free-spinning dynamically scaled models of about 100 different airplane designs and, whenever possible, includes correlation with full-scale spin tests. The research results are discussed in terms of airplane design considerations and the proper use of controls for recovery.
An investigation was conducted to evaluate the effectiveness of an automatic spin-prevention system for current fighter airplanes as a first step in determining the feasibility of such a system. The concept makes use of the components of the conventional flight-control system with the addition of control logic to monitor angle of attack, yaw rate, and normal acceleration. Analytical techniques were used to study the system concept applied to three representative fighter configurations, and model flight tests were employed to evaluate a prototype system on a representative fighter configuration. Emphasis was placed on the development of the control logic required. A discussion of possible implementations of the system concept is presented. Results of the investigation indicated that a relatively simple system (with full control authority) was effective in preventing the developed spins of the fighter configurations considered and that the system design is dependent on the stall and spin characteristics of the particular airplane.
The study is presented in terms of the following major problem areas: interpretation of results of spin-model research, analytical spin studies, techniques involved in obtaining measurements of various parameters in the spin, effectiveness of controls during spin and recoveries, influence of long noses, strakes, and canards on spin and recovery characteristics, and correlation of spin and recovery characteristics for recent airplane and model designs.