NDLI: Aeromechanics analysis of a compound helicopter

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Aeromechanics analysis of a compound helicopter

Content Provider	NASA Technical Reports Server (NTRS)
Author	Johnson, Wayne Yeo, Hyeonsoo
Copyright Year	2006
Description	A design and aeromechanics investigation was conducted for a 100,000-lb compound helicopter with a single main rotor, which is to cruise at 250 knots at 4000 ft/95 deg F condition. Performance, stability, and control analyses were conducted with the comprehensive rotorcraft analysis CAMRAD II. Wind tunnel test measurements of the performance of the H-34 and UH-1D rotors at high advance ratio were compared with calculations to assess the accuracy of the analysis for the design of a high speed helicopter. In general, good correlation was obtained with the increase of drag coefficients in the reverse flow region. An assessment of various design parameters (disk loading, blade loading, wing loading) on the performance of the compound helicopter was made. Performance optimization was conducted to find the optimum twist, collective, tip speed, and taper using the comprehensive analysis. Blade twist was an important parameter on the aircraft performance and most of the benefit of slowing the rotor occurred at the initial 20 to 30% reduction of rotor tip speed. No stability issues were observed with the current design and the control derivatives did not change much with speed, but did exhibit significant coupling.
File Size	365040
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20070017928
Archival Resource Key	ark:/13960/t3kx0cg3g
Language	English
Publisher Date	2006-05-09
Access Restriction	Open
Subject Keyword	Aircraft Design, Testing And Performance Fluid Mechanics Aerodynamic Drag Stability Compound Helicopters Wind Tunnel Tests Rotor Speed Aerodynamic Coefficients Rotary Wing Aircraft Design Analysis Helicopter Design Tip Speed Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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