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| | #1 |
| Junior Member Join Date: Apr 2009
Posts: 2
| Question about NACA airfoils I recently found a site with a lot of NACA airfoil profiles given as coordinates. When I looked at the NACA 0008 and 0009 profiles I found that they were symmetrical about the horizontal (they had no camber). Is there something I'm missing or did early airfoils have to be angled to provide lift? |
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| | #2 | |
| Senior Member Join Date: Jun 2006 Location: oregon
Posts: 3,944
| Quote:
Additionally the Theodorsen Transformation yielded a forward solution, using a complex variable mapping of a rotating cylinder immersed in an airflow (think curveball), to design an airfoil with a specific velocity distribution target. - Its immediate application was cambered wings. Theodorsen and Von Karman were the leading intellects in the US driving theory and knowledge of thin airfoil theory. | |
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| | #3 |
| Junior Member Join Date: Apr 2009
Posts: 2
| Thank you for the quick reply. I was not aware that airfoils relying on a non zero angle of attack for lift were so common. |
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| | #4 | |
| Senior Member Join Date: Jun 2006 Location: oregon
Posts: 3,944
| Quote:
At zero angle the symmetrical airfoil has equal velocity over both top and bottom surfaces - no lift until AoA changes one direction or the other | |
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| | #5 | |
| Senior Member Join Date: Jun 2006 Location: oregon
Posts: 3,944
| Quote:
At zero angle the symmetrical airfoil has equal velocity over both top and bottom surfaces - no lift until AoA changes one direction or the other. As to examples - think of most all USAF fighter a/c since Mustang | |
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| | #6 |
| Senior Member Join Date: Mar 2008
Posts: 270
| The tail surfaces of most planes are symmetrical airfoils. - Ivan. |
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