Search Results

The purpose of this paper is to compare classical handbook methods used to predict performance parameters such as range and endurance to computer based methods. Three different methods are compared: classical handbook methods are based on simple drag polars and engine performance data, spreadsheet methods use more detailed engine data and drag polars and third is the use of APP (Aircraft Performance Program), a commercially available software program. The advantages and disadvantages of each method are described and accuracy listed based on existing airplanes. One example is used: a business jet type aircraft. Methods used are described and inputs and outputs of the different programs used are shown.

DARcorporation developed an interactive, user-friendly windows based computer program to perform preliminary design and analysis functions for fixed wing airplanes. This paper shows a new development in presenting airplane geometric configuration data in a user-friendly manner. The ease of use will bring computer aided design and drafting methods to people previously not exposed to these methods because of the high amount of difficult computer and software knowledge needed.

DARcorporation developed an interactive, user-friendly windows based computer program to perform preliminary design and analysis functions for fixed wing airplanes. This paper shows the development of AGDA: Airplane Geometry Design Assistant, a program used to facilitate the geometric data transfer between analysis and CAD software. One major problem with the use of standard CAD programs is how to recognize different parts of the airplane in the analysis programs. Most routines need certain geometric parameters of the airplane e.g. wing span, fuselage length etc. An easier and user-friendlier method is to use an interface program between the analysis and the standard (commercially available) drafting program, which takes away the drawing instructions. In this way the user can concentrate on making the drawing without having to worry about how the program wants the different parts drawn.

In 2004 the FAA finalized the Sport Pilot/Light Sport Aircraft (LSA) category. This category of affordable aircraft makes owning an aircraft more accessible than ever. There are two airworthiness certification categories: 1 A special light-sport aircraft (S-LSA), sold ready-to-fly that maybe used for flight training, rental, or personal flight, including personal flight instruction. 2 An experimental light-sport aircraft (E-LS), sold in a kit form that may be used for personal recreational flight or personal flight training. This paper describes a design applicable to the first category: S-LSA. The aircraft will be primarily used for recreational purposes and a sport pilot may only operate this airplane during daylight hours. The occupants are seated in tandem. A three-surface design is chosen for its aerodynamic efficiency. The paper describes the design philosophy, design requirements, weight sizing, performance sizing, weight and balance, aerodynamics and stability and control.

Experience has shown that process and system level thinking enables significant reductions in design cycle time by avoiding technically correct but irrelevant calculations. Irrelevance often arises when the correct analysis is performed at the wrong stage in the product definition. Current iterative approaches to engineering design require considerable duplication of effort, much of which comes from modeling multiple design abstractions for varied levels and types of analyses. To ensure that appropriate domain knowledge is available at the appropriate time, skills and experience with tools that enable more robust trade studies for increasingly detailed design with inputs from increasingly diverse disciplines are required. Vehicle-focused efforts have broad appeal for attracting high quality, diverse students and facilitate strategic alignment of teaching and research.

DARcorporation is developing an interactive, user-friendly computer program to perform preliminary design and analysis functions for fixed wing general aviation airplanes. The system allows design engineers to rapidly evolve an aircraft configuration from weight sizing through detailed performance calculations, while working within regulatory constraints. This paper shows the main features of the newly developed user interface for general aviation airplane design in a windows based environment. The ease of use will bring computer aided design methods to people previously not exposed to these methods because of the high amount of difficult computer knowledge needed.