Accession Number : ADA333450

Title :   Analysis of Potential Structural Design Modifications for the Tail Section of the RAH-66 Comanche Helicopter.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Tobin, Vincent M.

PDF Url : ADA333450

Report Date : JUN 1997

Pagination or Media Count : 119

Abstract : The Army RAH-66 Comanche Helicopter made its first flight in January of 1996. Its current structural configuration, however does not meet the Army's requirements for radar signature. Structural configurations of the tailcone that meet radar cross-section requirements tend to lack sufficient structural stiffness due to the presence of Kevlar in place of graphite on the outer mold line. This thesis investigates potential structural design modifications to the Comanche tailcone that would move the design closer to meeting both its structural and radar signature requirements. Geometry modifications with baseline (current configuration) materials increased torsional stiffness by nine percent. Structural geometry modifications using radar signature compliant materials reduced torsional stiffness by 10 percent. The geometry changes analyzed produce structural performance improvements insufficient to allow the use of radar-compliant materials without further geometry changes.

Descriptors :   *MODIFICATION, *HELICOPTERS, *RADAR SIGNATURES, REQUIREMENTS, STRUCTURAL PROPERTIES, TAIL ASSEMBLIES, STRUCTURAL ANALYSIS, STIFFNESS, THESES, GRAPHITE, GEOMETRY, STRUCTURAL ENGINEERING.

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE