The E6B (also known as the “whiz wheel”) is a portable flight computer. It is in the form of circular slide rule. They are mostly used in flight training, but some professional pilots will still carry and use theirs. E6Bs 
are used during flight planning (both preflight and during flight) to aid in calculating figures such as fuel burn and wind corrections. In the air, the E6B can be used to calculate ground speed as well. The back is designed for wind correction calculations, i.e., determining how much the wind is affecting your speed and course. The E6B was invented by Naval Lt. Philip
Dalton in the late 1930s. The name E6B comes from its original part number for the U.S Army Air Corps in World War II. The E6B comes in two different variations; the electronic and the standard. The standard version is most used by student pilots in order to understand how the calculations work. They are made out of either aluminum and plastic or cardboard and plastic. The aluminum ones are much more durable. The electronic ones are more accurate but are prone to errors or malfunctions. All in all, the E6B is a necessity to a thorough tool for a successful flight.
Evan Krueger
Thank the Lord for electronic E6B’s!