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There are a total of 29 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Longitudinal aerodynamics of a low-wing lift-fan transport including hover characteristics in and out of ground effect
Author(s): Hoad, D. R.; Gentry, G. L., Jr.
Abstract: A wind-tunnel investigation was conducted in the Langley V/STOL tunnel to determine the longitudinal aerodynamic characteristics of a six-fan, tip-driven (remote) lift-fan VTOL transport throughout transition. The large ...
NASA Center: Langley Research Center
Publication Year: 1975
Added to NTRS: 2008-07-01
Accession Number: 75N21248; Document ID: 19750013176; Report Number: NASA-TM-X-72670
Longitudinal aerodynamic characteristics of a low-wing lift-fan transport including hover characteristics in and out of ground effect
Author(s): Hoad, D. R.; Gentry, G. L., Jr.
Abstract: The longitudinal aerodynamic characteristics of a six-fan, tip-driven (remote) lift-fan VTOL transport through transition were determined by an investigation conducted in the Langley V/STOL tunnel. Tests were also made with ...
NASA Center: Langley Research Center
Publication Year: 1977
Added to NTRS: 2008-02-08
Accession Number: 77N20029; Document ID: 19770013085; Report Number: L-10942, NASA-TM-X-3420
Reduction of high-speed impulsive noise by blade planform modification of a model helicopter rotor
Author(s): Conner, D. A.; Hoad, D. R.
Abstract: The reduction of high speed impulsive noise for the UH-1H helicopter was investigated by using an advanced main rotor system. The advanced rotor system had a tapered blade planform compared with the rectangular planform of ...
NASA Center: Langley Research Center
Publication Year: 1982
Added to NTRS: 2007-06-25
Accession Number: 83N16151; Document ID: 19830007880; Report Number: AVRADCOM-TR-82-B-6, L-15511, NAS 1.15:84553, NASA-TM-84553
Helicopter noise research at the Langley V/STOL tunnel
Author(s): Hoad, D. R.; Green, G. C.
Abstract: The noise generated from a 1/4-scale AH-1G helicopter configuration was investigated in the Langley V/STOL tunnel. Microphones were installed in positions scaled to those for which flight test data were available. Model and ...
NASA Center: Langley Research Center
Publication Year: 1978
Added to NTRS: 2007-06-21
Accession Number: 78N32826; Document ID: 19780024883
Externally blown flap impingement parameters
Author(s): Hoad, D. R.
Abstract: The performance of two externally blown flap (EBF) wind tunnel models was compared with an engine exhaust flap impingement correlation parameter. One model was a four engine EBF triple slotted flap transport. Isolated engine ...
NASA Center: NASA (non Center Specific)
Publication Year: 1976
Added to NTRS: 2006-08-02
Accession Number: 78N24053; Document ID: 19780016110
Facility requirements for helicopter noise research
Author(s): Schlinker, R. H.; Hoad, D. R.
Abstract: Development of future helicopter noise prediction methods requires an accurate experimental data base for correlation studies or assessment of theoretical prediction methods. The aerodynamic and acoustic performance criteria ...
NASA Center: NASA (non Center Specific)
Publication Year: 1982
Added to NTRS: 2006-08-02
Accession Number: 84N29672; Document ID: 19840021603
Application of the laser velocimeter to airfoil research
Author(s): Hoad, D. R.
Abstract: A laser velocimeter (LV) was installed in the Langley V/STOL tunnel to measure the velocity field about a wing with a NACA 0012 airfoil section. These measurements were compared at low angle of attack with a two dimensional, ...
NASA Center: Langley Research Center
Publication Year: 1978
Added to NTRS: 2006-08-02
Accession Number: 79N19997; Document ID: 19790011826
NASA/Army supported noise source/noise reduction programs at Langley
Author(s): Hoad, D. R.
Abstract: The helicopter noise research related to noise source mechanism identification and reduction includes many of the critical noise problems experienced by the helicopter. These include blade vortex interaction (BVI) noise, ...
NASA Center: NASA (non Center Specific)
Publication Year: 1982
Added to NTRS: 2006-08-02
Accession Number: 84N29669; Document ID: 19840021600
A laser velocimeter flow survey above a stalled wing
Author(s): Young, W. H., Jr.; Meyers, J. F.; Hoad, D. R.
Abstract: A laser velocimeter operating in the backscatter mode was used to survey the flow about a stalled wing installed in the Langley V/STOL tunnel. Mean velocities and magnitudes of velocity fluctuations were calculated from ...
NASA Center: Langley Research Center
Publication Year: 1978
Added to NTRS: 2005-10-13
Accession Number: 79N14019; Document ID: 19790005848; Report Number: AVRADCOM-TR-78-50, NASA-TP-1266
Evaluation of helicopter noise due to b blade-vortex interaction for five tip configurations
Author(s): Hoad, D. R.
Abstract: The effect of tip shape modification on blade vortex interaction induced helicopter blade slap noise was investigated. Simulated flight and descent velocities which have been shown to produce blade slap were tested. ...
NASA Center: Langley Research Center
Publication Year: 1979
Added to NTRS: 2005-10-13
Accession Number: 80N14840; Document ID: 19800006582; Report Number: AVRADCOM-TR-80-B-1, L-13207, NASA-TP-1608
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