How to Use the Manual E6B Flight Computer



How to Use a Graphic Flight Computer to Find Ground Speed and True Heading

An E-6B manual flight computer is waterproof, shock-resistant and doesn't require batteries, making it an ideal tool for pilots while flying. This nifty contraption has both a computer and wind side. The computer side is a circular slide rule that can perform multiplication and division problems to find time, speed & distance, fuel consumption, true airspeed, and density altitude. The wind side uses a rotating disc, called the azimuth plate, marked with 360 degree compass headings, and a sliding grid with speed and angle markings to find wind correction angle, ground speed, true heading, and most favorable winds. This article tells how to use the wind side to find ground speed and true heading. You must know the wind speed & direction, true course, and true airspeed.

Steps

  1. Align the wind direction under the "True Index" mark by rotating the azimuth plate.If the winds are from 330° at 20 knots, align 330 under the true index.
  2. Align the grid so the center grommet is over one of the heavy lines.It doesn't matter which line is used at this point.
  3. Mark the wind speed by counting up from the center grommet.Each light line represents two knots. Mark a dot or an X in pencil on the 20 knot line (two heavy lines above the center grommet). This is the wind dot.
  4. Rotate the azimuth plate until your desired course (true course) is aligned under the True Index mark.Use 175° for this example.
  5. Slide the grid until the wind dot is over your true airspeed.In this example, the true airspeed is 120 knots.
  6. Read ground speed under the grommet.Ground speed is the speed of the aircraft over the ground and in this example is 138 knots.
  7. Find the wind correction angle (WCA) by checking the number of degrees to the right or left between the center grommet and the wind dot.If the wind dot is to the right, the WCA is positive. If it is to the left, the WCA is negative. In the example, the wind correction angle is +4°.
  8. Add or subtract the wind correction angle from the true course to find true heading.Adding 4° to 175 equals 179° for the true heading.
  9. Add (or subtract) magnetic variation and compass deviation to find the compass heading to be flown.The variation is the difference between true north and magnetic north and can be found on a VFR or IFR chart. Easterly variations are subtracted and westerly variations are added. Compass deviation is printed on a placard under the magnetic compass in the airplane.

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    If you plan to actually fly an aircraft, you will need to get an E6B flight computer. Always take it with you on your flight training.
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  • Electronic flight computers can also provide this information but require batteries which could fail during a flight.
  • If you know ground speed between checkpoints and the wind correction angle, the process can be followed backwards to find actual wind speed and direction while flying.
  • If the wind dot is below the grommet, you have a tailwind; if it is above the grommet, you have a headwind.





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How to Use a Graphic Flight Computer to Find Ground Speed and True Heading
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Date: 02.12.2018, 23:24 / Views: 81474