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NACA-MR-A4L28
Wind Tunnel Investigation of the Effects of Slot Shape and Flap Location on the Characteristics of a Low-Drag Airfoil Equipped with a 0.25-Chord Slotted Flap
Year: 1944
Abstract: An investigation was made to determine the effects of slot shape and flap location on the characteristics of an NACA 66,2-2!6 (a = 0.6) airfoil equipped with a 0.25-chord slotted flap to provide a basis for the study of drooped airlerons. Two slots were investigated and practical flap paths were selected for each. One slot had a rounded entry; the other had an entry designed to reduce the gap with the flap retracted to a practical minimum.
Slot shape was found to have a negligible effect on the maximum lift coefficient if the flap was properly located. With the flap deflected, the rounded-entry slot had lower drag coefficients for intermediate lift coefficients than the minimum-gap slot. For either slot, the increment of section pitching-moment coefficient caused by flap deflection was approximately proportional to the increment of section lift coefficient.
Slot shape was found to have a negligible effect on the maximum lift coefficient if the flap was properly located. With the flap deflected, the rounded-entry slot had lower drag coefficients for intermediate lift coefficients than the minimum-gap slot. For either slot, the increment of section pitching-moment coefficient caused by flap deflection was approximately proportional to the increment of section lift coefficient.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:45:58Z | |
| date available | 2017-09-04T15:45:58Z | |
| date copyright | 01/01/1944 | |
| date issued | 1944 | |
| identifier other | PTUYYDAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/48593 | |
| description abstract | An investigation was made to determine the effects of slot shape and flap location on the characteristics of an NACA 66,2-2!6 (a = 0.6) airfoil equipped with a 0.25-chord slotted flap to provide a basis for the study of drooped airlerons. Two slots were investigated and practical flap paths were selected for each. One slot had a rounded entry; the other had an entry designed to reduce the gap with the flap retracted to a practical minimum. Slot shape was found to have a negligible effect on the maximum lift coefficient if the flap was properly located. With the flap deflected, the rounded-entry slot had lower drag coefficients for intermediate lift coefficients than the minimum-gap slot. For either slot, the increment of section pitching-moment coefficient caused by flap deflection was approximately proportional to the increment of section lift coefficient. | |
| language | English | |
| title | NACA-MR-A4L28 | num |
| title | Wind Tunnel Investigation of the Effects of Slot Shape and Flap Location on the Characteristics of a Low-Drag Airfoil Equipped with a 0.25-Chord Slotted Flap | en |
| type | standard | |
| page | 55 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1944 | |
| contenttype | fulltext |