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X-43a flight-test-determined aerodynamic force and moment characteristics at mach 7.0
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Davis, Mark C. White, J. Terry |
| Copyright Year | 2008 |
| Description | The second flight of the Hyper-X program afforded a unique opportunity to determine the aerodynamic force and moment characteristics of an airframe-integrated scramjet-powered aircraft in hypersonic flight. These data were gathered via a repeated series of pitch, yaw, and roll doublets, frequency sweeps, and pushover-pullup maneuvers performed throughout the X-43A cowl-closed descent. Maneuvers were conducted at Mach numbers of 6.80-0.95 and at altitudes from 92,000 ft mean sea level to sea level. The dynamic pressure varied from 1300 to 400 psf with the angle of attack ranging from 0 to 14 deg. The flight-extracted aerodynamics were compared with preflight predictions based on wind-tunnel test data. The X-43A flight-derived axial force was found to be 10-15%higher than prediction. Underpredictions of similar magnitude were observed for the normal force. For Mach numbers above 4.0, the flight-derived stability and control characteristics resulted in larger-than-predicted static margins, with the largest discrepancy approximately 5 in. forward along the x-axis center of gravity at Mach 6.0. This condition would result in less static margin in pitch. The predicted lateral-directional stability and control characteristics matched well with flight data when allowance was made for the high uncertainty in angle of sideslip. |
| File Size | 5586534 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080021260 |
| Archival Resource Key | ark:/13960/t51g5p624 |
| Language | English |
| Publisher Date | 2008-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Flight Tests Hypersonic Flight Engine Airframe Integration Lateral Stability Frequencies Aerodynamic Forces Aerodynamic Stability Yaw Directional Stability Wind Tunnel Tests Angle of Attack Mach Number Dynamic Pressure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
