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Wind Side of the CR-3

Learn how to calculate wind correction angles using a flight computer for precise navigation during flight. Step-by-step instructions and examples provided.

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Wind Side of the CR-3

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  1. Wind Side of the CR-3 • Step 1 Align wind direction over the True Course Index (TC) • Step 2 Place Wind Dot up from centre • Step 3 Align True Track over the True Course Index • Step 4 Point True Airspeed to True Airspeed value • Step 5 View Crosswind under vertical line • Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • Step 7 Read wind Component under horizontal line

  2. Step 1 Align wind direction over the True Course Index (TC) • Place wind direction over True Course Index. • In this example, the wind direction is 050°.

  3. Step 2 Place Wind Dot up from centre • Place Wind Dot up from centre. • In this example, the wind strength is 20 knots.

  4. Step 3 Align True Track over the True Course Index • Place True Track over True Course Index. • In this example, the TT is 190°.

  5. Step 4 Point True Airspeed to True Airspeed value • Place TAS to TAS value. • In this example, the TAS is 108kts.

  6. Step 5 View Crosswind under vertical line • Draw line vertically to x axis. • In this example, the Left Crosswind is 13.

  7. Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • Read Crosswind on outside scale and view WCA aligned with Crosswind on inside scale • Always round to the nearest degree.

  8. Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • In this example, the WCA is 7°E. • Subtract Left Crosswind

  9. Step 7 Read wind Component under Horizontal line • Draw line horizontally to y axis. • In this example, the wind component is a tailwind of 16 knots. • Add tailwind • Subtract headwind

  10. Applying the Information From the Flight Computer This chart will assist you in applying the information from the flight computer. The numbers for the chart above will either be given or calculated from the flight computer. Let’s try to complete the chart. Good Luck!

  11. Applying the Information From the Flight Computer Fill in the True Track that is given. 190° GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  12. Applying the Information From the Flight Computer Calculate Wind Correction Angle from flight computer. 190° 7°E GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  13. Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • In this example, the WCA is 7°E.

  14. Applying the Information From the Flight Computer Calculate True Heading by +/- WCA 190° 7°E 183° GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  15. Applying the Information From the Flight Computer Fill in Variation that is given. 190° 7°E 183° 21°W GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  16. Applying the Information From the Flight Computer Calculate Magnetic Heading by +/- Variation. 190° 7°E 183° 21°W 204° GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  17. Applying the Information From the Flight Computer Fill in Deviation that is given. 190° 7°E 183° 21°W 204° 2°E GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  18. Applying the Information From the Flight Computer Calculate Compass Heading by +/- Deviation. 190° 7°E 183° 21°W 204° 2°E 202° GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  19. Applying the Information From the Flight Computer Calculate Ground Speed from flight computer. 190° 7°E 183° 21°W 204° 2°E 202° GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  20. Step 7 Read Wind Component under horizontal line • Draw line horizontally to y axis. • In this example, the wind component is a tailwind of 16 knots. • Add tailwind • Subtract headwind

  21. Applying the Information From the Flight Computer ** TAS +/- Headwind or Tailwind = Ground Speed. ** 190° 7°E 183° 21°W 204° 2°E 202° 124kts GIVEN Wind = 05020kts Variation = 21°W Deviation = 2°E True Track = 190° True Airspeed = 108kts

  22. To view procedure step by step again click the flight computer.To advance to another example click the next slide button. Wind Side of the CR-3

  23. Applying the Information From the Flight Computer Let’s try another example. 44° GIVEN Wind = 35615kts Variation = 14°W Deviation = 1°W True Track = 44° True Airspeed = 124kts

  24. Applying the Information From the Flight Computer Try to calculate WCA before advancing. 44° GIVEN Wind = 35615kts Variation = 14°W Deviation = 1°W True Track = 44° True Airspeed = 124kts

  25. Step 1 Align wind direction over the True Course Index • Place wind direction over True Course Index. • In this example, the wind direction is 356°.

  26. Step 2 Place Wind Dot up from centre • Place Wind Dot up from centre. • In this example, the wind strength is 15 knots.

  27. Step 3 Align True Track over the True Course Index • Place True Track over True Course Index. • In this example, the TT is 44°.

  28. Step 4 Point True Airspeed to True Airspeed value • Place TAS to TAS value. • In this example, the TAS is 124°.

  29. Step 5 View Crosswind under vertical line • Draw line vertically to x axis. • In this example, the Left Crosswind is 10.

  30. Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • Read Crosswind on outside scale and view WCA aligned with Crosswind on inside scale • Always round to the nearest degree.

  31. Step 6 Read Crosswind on outside scale and view Wind Correction Angle aligned with Crosswind on inside scale • In this example, the WCA is 5°E. • Subtract Left Crosswind

  32. Applying the Information From the Flight Computer Let’s try another example. 44° 5°E 39° 14°W 53° 1°W 54° GIVEN Wind = 35615kts Variation = 14°W Deviation = 1°W True Track = 44° True Airspeed = 124kts

  33. Applying the Information From the Flight Computer Try to calculate GS before advancing. 44° 5°E 39° 14°W 53° 1°W 54° GIVEN Wind = 35615kts Variation = 14°W Deviation = 1°W True Track = 44° True Airspeed = 124kts

  34. Step 7 Read wind Component under horizontal line • Draw line horizontally to y axis. • In this example, the wind component is a headwind of 10 knots.

  35. Applying the Information From the Flight Computer Let’s try another example. 44° 6°E 38° 14°W 52° 1°W 53° 114kts GIVEN Wind = 35615kts Variation = 14°W Deviation = 1°W True Track = 44° True Airspeed = 124kts

  36. Congratulations! You have completed the Wind Side of the CR-3 or E6-B Flight Computer lesson. Of course, this section always available to you for future reference if required. To return to main lesson click terminate.

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