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Then move the slide until the “grommet” in the centre is over any convenient arc (I usually use one of the 5 knot increments, e.g. Draw the wind arrow starting 30kt further up the slider, pointing into the grommet (click on the picture for a better view). of the arrow is on the arc corresponding to the true airspeed. The wind correction angle is given by the radial line where the tail of the arrow is.

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Solving the wind triangle is the only non-trivial math needed by the private pilot.

Unlike weight-and-balance or speed-time-distance calculations which are just simple arithmetic, the wind triangle requires trigonometry.

Like the E6-B, the reverse side of the CR-3 is used to solve wind triangles, but in a very different way.

Jeppesen’s design, dating from 1955, provides a wind solution that doesn’t require any sliding parts.

When I first saw a Jeppesen CR-3 flight computer, I was intrigued by the fact that it could do a wind solution with no slide.

The solution requires about the same amount of work as using the E6-B, but the steps are different.This in turn affects the time it will take to get where we’re going, and thus also the amount of fuel needed.Given the speed and direction of the wind (from forecasts), our desired course, and our true airspeed (from the airplane’s flight manual), the wind triangle solution tells us the necessary heading to use, and what our groundspeed will be.It takes about the same number of steps, but they are quite different than those performed on the E6-B.The rest of this article compares the wind triangle solutions of these two flight computers.The arrow tail is on our right, so our wind correction will be to the right, meaning we have to add the 11.5° to our desired 240° course, giving a 251.5° heading (this is a heading, so don’t forget to correct for magnetic variation before setting off).

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