Author : George M. Ware
Publisher :
Page : 36 pages
File Size : 34,41 MB
Release : 1993
Category : Aerodynamics
ISBN :
[PDF] Subsonic Aerodynamic Characteristics Of The Hl 20 Lifting Body Configuration eBook
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Subsonic Aerodynamic Characteristics of the Hl-20 Lifting-Body Configuration
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 32 pages
File Size : 49,33 MB
Release : 2018-07-11
Category :
ISBN : 9781722826437
The HL-20 is proposed as a possible future manned spacecraft. The configuration consists of a low-aspect-ratio body with a flat undersurface. Three fins (a small centerline fin and two outboard (tip) fins set at a dihedral angle of 50 deg) are mounted on the aft body. The control system consists of elevon surfaces on the outboard fins, a set of four body flaps on the upper and lower aft body, and an all-movable center fin. Both the elevons and body flaps were capable of trimming the model to angles of attack from -2 deg to above 20 deg. The maximum trimmed lift-drag ratio was 3.6. Replacing the flat-plate tip fins with airfoil tip fins increased the maximum trimmed lift-drag ratio to 4.2. The elevons were effective as a roll control, but they produced about as much yawing moment as rolling moment because of the tip-fin dihedral angle. The body flaps produced less rolling moment than the elevons and only small values of yawing moment. A limited investigation of the effect of varying tip-fin dihedral angle indicated that a dihedral angle of 50 deg was a reasonable compromise for longitudinal and lateral stability, longitudinal trim, and performance at subsonic speeds. Ware, George M. and Cruz, Christopher I. Langley Research Center RTOP 505-40-61-01...
Aerodynamic Characteristics and Control Effectiveness of the HL-20 Lifting Body Configuration at Mach 10 in Air
Author : William I. Scallion
Publisher :
Page : 62 pages
File Size : 19,5 MB
Release : 1999
Category : Airplanes
ISBN :
A 0.0196-scale model of the HL-20 lifting body, one of several configurations proposed for future crewed spacecraft, was tested in the Langley 31-Inch Mach 10 Tunnel. The purpose of the tests was to determine the effectiveness of fin-mounted elevons, a lower surface flush-mounted body flap, and a flush-mounted yaw controller at hypersonic speeds. The nominal angle-of-attack range, representative of hypersonic entry, was 20 to 41 degrees, the sideslip angles were 0, 2, and -2 degrees, and the test Reynolds number was 1.06 x 10[factor 6] based on model reference length. The aerodynamic, longitudinal, and lateral control effectiveness along with surface oil flow visualizations are presented and discussed. The configuration was longitudinally and laterally stable at the nominal center of gravity. The primary longitudinal control, the fin-mounted elevons, could not trim the model to the desired entry angle of attack of 30 degrees. The lower surface body flaps were effective for roll control and the associated adverse yawing moment was eliminated by skewing the body flap hinge lines. A yaw controller, flush-mounted on the lower surface, was also effective, and the associated small rolling moment was favorable.
Lift and Drag Characteristics of the HL-10 Lifting Body During Subsonic Gliding Flight
Author : Jon S. Pyle
Publisher :
Page : 36 pages
File Size : 45,1 MB
Release : 1971
Category : Drag (Aerodynamics)
ISBN :
Preliminary Subsonic Aerodynamic Model for Simulation Studyes of the HL-20 Lifting Body
Author : E. Bruce Jackson
Publisher :
Page : 66 pages
File Size : 46,15 MB
Release : 1992
Category :
ISBN :
Preliminary Subsonic Aerodynamic Model for Simulation Studies of the HL-20 Lifting Body
Author : E. Bruce Jackson
Publisher :
Page : 72 pages
File Size : 40,50 MB
Release : 1992
Category :
ISBN :
Subsonic Aerodynamic Characteristics of a Model of HL-10 Flight Research Vehicle with Basic and Modified Tip Pins
Author :
Publisher :
Page : 572 pages
File Size : 44,24 MB
Release : 1971
Category :
ISBN :
Monthly Catalogue, United States Public Documents
Author :
Publisher :
Page : 872 pages
File Size : 46,38 MB
Release : 1994-08
Category : Government publications
ISBN :
Monthly Catalog of United States Government Publications
Author :
Publisher :
Page : pages
File Size : 33,34 MB
Release : 1994
Category : Government publications
ISBN :
Control Effectiveness and Tip-fin Dihedral Effects for the HL-20 Lifting-body Configuration at Mach Numbers from 1.6 to 4.5
Author : Christopher I. Cruz
Publisher :
Page : 96 pages
File Size : 40,42 MB
Release : 1995
Category : Aerodynamics
ISBN :