Subsonic aerodynamic characteristics of the HL-20 lifting-body configuration
- Author:
- Cruz, Christopher I.
- Published:
- Nov 1, 1993.
- Physical Description:
- 1 electronic document
- Additional Creators:
- Ware, George M.
- Access Online:
- hdl.handle.net
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
- Summary:
- 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.
- Collection:
- NASA Technical Reports Server (NTRS) Collection.
- Note:
- Document ID: 19940012811.
Accession ID: 94N17284.
NASA-TM-4515.
L-17261.
NAS 1.15:4515. - Terms of Use and Reproduction:
- No Copyright.
- Access Online:
- hdl.handle.net
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