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.
Downforce - Airfoils. 1  The amount of downforce created by the wings or spoilers on a car is dependent primarily on two things... 2  The shape, including surface area, aspect ratio and cross-section of the device, and. 3  The device's orientation (or angle of attack).