Today is the Longest Day of the Year (Photos of the Midnight Sun) June 21 gets the prize as the longest day of the year 2013 in Iceland. Whatâs more, summer seems to be arriving in ReykjavÃ­k. Last night people were waiting to see the midnight sun set, well at midnight in ReykjavÃ­k. The air was calm and clean and so were the people who sat on the shore.
Definition of airfoil. : a body (such as an airplane wing or propeller blade) designed to provide a desired reaction force when in motion relative to the surrounding air.
+ Contact Glenn. This slide gives technical definitions of a wing's geometry, which is one of the chief factors affecting airplane lift and drag. The terminology is used throughout the airplane industry and is also found in the FoilSim interactive airfoil simulation program developed here at NASA Glenn. Actual aircraft wings are complex three-dimensional objects, but we will start with some simple definitions.