Preliminary Sizing In Airplane Design

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Amity Institute of Space Science &Technology AMITY UNIVERSITY, NOIDA Abstract This thesis covers the subject of preliminary sizing together with the development of the SAS Optimizations tool for CS-VLA certification requirements. Preliminiary sizing is a very important step in the process of designing an airplane as it decides if the airplane will be further developed or not. The design of an airplane is defined by different specifications and requirements that can follow from a mission specification or market research, etc. The goal of preliminary sizing is translating these requirements and specifications into design and performance parameters. Most of these requirements and specifications are defined by certification requirements. Therefore…show more content…
Introduction to Preliminary Sizing Preliminary Sizing is an important phase in airplane design, therefore this part will explain a bit more about the design process of an airplane. Airplane design can be considered as an art and a science, which is closely connected to airplane performance. Airplane design and performance can almost be called twins. To get a good definition of airplane design, Anderson 1999 states it as follows: Airplane design is the intellectual engineering process of creating on paper (or on a computer screen) a flying machine to (1) meet certain specifications and requirements established by potential users (or as perceived by the manufacturer) and/or (2) pioneer innovative, new ideas and technology. 2.1 Mission Specifications and Requirements To design an airplane, a mission specification is needed. The mission specification defines certain requirements. These requirements are unique and different for each new airplane design. Typical requirements are:  Range  Take-off distance  Stalling velocity  Endurance  Maximum velocity  Fuel reserves  Climb…show more content…
After the preliminary sizing an important question should be asked: can this design meet the specifications? Therefore preliminary sizing is an important and decisive step in the airplane design process, as it will determine if the design will result in a full-scale design-development. If the design meets the specifications the next step will be optimization. Optimization is making sure that the design meets the specifications in the most optimal and economical way. 2.3 Preliminary Design Next step in the airplane design process is the preliminary design phase. In this phase only minor changes are made to the configuration layout. Preliminary design is a more detailed design phase where questions are asked as: what systems are needed to control this airplane? How will the air flow around the airplane? Is there undesirable aerodynamic interference? What about stability? All these questions will define the precisely defined configuration or cancel the full-scale design development of the airplane. Figure 2.1 gives a visualization of the overall design process. Figure 2.1 Evolution of a design (Roskam) 3 Airworthiness Requirements In this part of the thesis the limitations and requirements defined by the different

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