The E6B flight computer , nicknamed the "whiz wheel" or " prayer wheel ", is a form of circular slide rule used in aviation and one of the very few analog calculating devices in widespread [ citation needed ] use in the 21st century. They are mostly used in flight training , because these flight computers have been replaced with electronic planning tools or software and websites that make these calculations for the pilots. These flight computers are used during flight planning on the ground before takeoff to aid in calculating fuel burn, wind correction, time en route, and other items. In the air, the flight computer can be used to calculate ground speed, estimated fuel burn and updated estimated time of arrival. The back is designed for wind vector solutions, i. Flight computers are usually made out of aluminum, plastic or cardboard, or combinations of these materials.
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Find wind correction angle, magnetic heading, and groundspeed. Use your flight computer to solve these practice problems answers are located below. The advantages of this method are You convert only one true direction to magnetic, not two. This is the way it has always been taught. We suggest converting TC and wind true to magnetic because pilot activities are in terms of magnetic headings, courses, runways, radials, bearings, and final approach courses.
When flying, you should always think magnetic, not true. While doing magnetic heading problems, you should visualize yourself flying each problem, e.
Mark Wind Dot up from Grommet. Place TC under True Index. Read GS under Grommet. Complete the problem by use of the formulas. It was developed prior to the VOR system, compass roses, airways, etc. Thus you may use it for textbook exercises, but when flying, think magnetic.
The first, or top, box is the sequence of information required for filing a flight plan. The middle box contains the special equipment codes used for item 3. The arcs represent the wind velocity in knots. From this point, move horizontally to the left margin to determine a headwind component of 26 kt. Now, move vertically down to determine a crosswind component of 15 kt. Landing in this situation is like having a kt.
On the side margins of the card are mileage scales for sectional charts. One side is in nautical miles and the other side is in statute miles. Check out our Products Or browse all our options in our online store. As your trusted partner in training, we want to see you succeed, now more than ever. Take advantage of this extra downtime to become a safer pilot! The circular portion can be turned. The outer scale is used to represent distance, fuel, ground speed, true airspeed, or corrected true altitude, depending on the calculation being performed.
The inner scale is used to represent time, calibrated or indicated airspeed, and calibrated or indicated altitude, depending on the calculation being performed. The number "60" on the inner scale has been replaced with a triangular-shaped arrow, referred to as the Index.
This arrow is used as a reference to a rate, such as knots nautical miles per hour or gallons per hour. In the center of the rotating portion are three "holes" windows used to compute corrected true altitude, density altitude, and true airspeed. Scale Values The numbers on the outer and inner scales represent multiples of 10 of the values shown.
On both the outer and inner scales you will notice that the number of tick marks, or graduations, vary between numbers. The first tick mark to the right of "17" may represent 1. The first tick mark to the right of "35" may represent 3.
The second tick mark to the right of "35" may represent 3. On the inner scale, minutes may be translated to hours and minutes by reference to the hour scale, which is below and inside the inner scale. Between "" and "" each tick mark represents 10 min. The tick marks on the inner scale can be used to supplement the hour scale. The calculator side of the flight computer is constructed so that any relationship, or ratio, between a number on the outer scale and a number on the inner scale will remain constant for all other numbers on both scales.
Rotate the inner circle so the "10" is opposite the "10" on the outer scale, and note that all the numbers around both circles are identical.
Next, rotate "20" under "10" on the outer scale; now all numbers on the inner scale are double those on the outer scale. Remember, the units you use must be equivalent, i. Rotate the inner scale so that , or "10," on the inner scale is under the "STAT" index arrow. Look at the "NAUT" index arrow on the outer scale to determine 87 kt. Check out our Products. Or browse all our options in our online store. Access Aviation Training Resources Now.