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Old Mar 02, 2004, 07:22 AM
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I guess the confusion arises because model airplane plans give the rib sections in line with the airflow and then go on to identify the section as XXXX0009. We then adopt the assumption that the rib section is analogous with the airfoil section. As most designs have the quarter chord line perpendicular with the airflow it makes no difference most of the time.

Ollie, you said,

"If you orient the airfoil to the free stream direction for a swept wing it has the effect of increasing the percentage thickness and percentage camber of the airfoil by the ratio of the chord in the free stream direction to the chord perpendicular to the 25% chord line"

Can I say that the Cl of a section is proportional to its thickness within a small range? ie XXXX thinned to 90% has a CL approximately 90% of the original section?

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Last edited by shaneyee; Mar 02, 2004 at 07:25 AM.
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