1941. Weight Estimating Methodology: NASP vs Other Programs

Publication Type	Conference Paper
Authors	Bonardi, G.
Year of Publication	1990
Paper Number	1941
Conference	49th Annual Conference, Chandler, Arizona, May 14-16
Conference Location	Chandler, Arizona
Paper Category	19. WEIGHT ENGINEERING - SPACECRAFT ESTIMATION
Pages	16
Date Published	5/14/90
Price	$7.00
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Key Words	19. WEIGHT ENGINEERING - SPACECRAFT ESTIMATION
Abstract	The intent of this paper is to explain the difference between the preliminary design weight estimation methodologies used on the National Aerospace Plane (NASP) and previous programs. Discussions focus upon issues inherent to NASP, special requirements, and other factors which drive the need for credible and accurate preliminary design weight estimates. Issues such as weight growth factors, non-optimum factors, airframe/engine vehicle integration constraints, manufacturing constraints, and incorporation of the ""illities"": Reliability, Maintainability, Supportability, and Safety (RMSS) are discussed. The design process is described, outlining die integrated approach used. This takes into account all disciplines and their individual and integrated effects upon the vehicle. The methodologies concepts are discussed as they are used on NASP with major differences between NASP and previous programs being outlined. Several charts comparing mass fractions for structures, landing gear, propulsion, and subsystems of NASP to those of previous programs are shown. These charts show where NASP is in relationship to history.