درباره ما
NACA-RM-L7K07
Flight characteristics at low speed of delta-wing models
Year: 1948
Abstract: An exploratory Investigation to obtain a survey of the flying characteristics at low speeds of models with low-aspect-ratio delta wings has been conducted in the Langley free-flight tunnel. Four models having triangular plan--form wings with 53°, 63 °, 76°, and 83 ° sweepback and five models having these same wings with the tips cut off to give taper ratios of 0.5 or 0.2 were used in this investigation.
It was found that the stability and control characteristics of the models with 53 ° or 63° sweepback and aspect ratios of 2 or 3 were fairly good. The power-off glide angles, however, were very steep at high lift coefficients. The flight characteristics of the models with 76° or 83° sweepback or aspect ratios of 1 or less were unsatisfactory because of unstable rolling oscillations at high lift coefficients or because of excessive changes in static longitudinal stability over the lift range.
It was found that the stability and control characteristics of the models with 53 ° or 63° sweepback and aspect ratios of 2 or 3 were fairly good. The power-off glide angles, however, were very steep at high lift coefficients. The flight characteristics of the models with 76° or 83° sweepback or aspect ratios of 1 or less were unsatisfactory because of unstable rolling oscillations at high lift coefficients or because of excessive changes in static longitudinal stability over the lift range.
Show full item record
| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:22:10Z | |
| date available | 2017-09-04T17:22:10Z | |
| date copyright | 01/01/1948 | |
| date issued | 1948 | |
| identifier other | ZVITDEAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/145404 | |
| description abstract | An exploratory Investigation to obtain a survey of the flying characteristics at low speeds of models with low-aspect-ratio delta wings has been conducted in the Langley free-flight tunnel. Four models having triangular plan--form wings with 53°, 63 °, 76°, and 83 ° sweepback and five models having these same wings with the tips cut off to give taper ratios of 0.5 or 0.2 were used in this investigation. It was found that the stability and control characteristics of the models with 53 ° or 63° sweepback and aspect ratios of 2 or 3 were fairly good. The power-off glide angles, however, were very steep at high lift coefficients. The flight characteristics of the models with 76° or 83° sweepback or aspect ratios of 1 or less were unsatisfactory because of unstable rolling oscillations at high lift coefficients or because of excessive changes in static longitudinal stability over the lift range. | |
| language | English | |
| title | NACA-RM-L7K07 | num |
| title | Flight characteristics at low speed of delta-wing models | en |
| type | standard | |
| page | 36 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1948 | |
| contenttype | fulltext |