![]() ![]() Rotate the inner scale so the Index is opposite 90, as shown in the figure.EXAMPLE: How far will the airplane fly in 8 min.Distance equals groundspeed multiplied by time. If you know groundspeed and time, you can determine the distance.Use your flight computer to solve these practice problems (answers are located below).on the inner scale or 1:12 on the hour scale. ![]() Under 120 on the outer scale read 72 min.Locate 120 NM, or "12," on the outer scale.Rotate the inner scale so the Index is opposite 100 kt., or "10," on the outer scale, as shown in the figure.EXAMPLE: How much time will it take to fly 120 NM at a groundspeed of 100 kt.?.Time equals distance divided by groundspeed. If you know the groundspeed and the distance, you can calculate the time.You can convert SM to NM or vice versa easily as explained in the preceding module.Note that in any problem both the speed and distance must be in either SM or NM.You can use your flight computer to make the above computations.With any two of these elements, you can compute the third (missing) element. Speed, distance, and time are three interrelated elements. Next, rotate "20" under "10" on the outer scale now all numbers on the inner scale are double those on the outer scale.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. ![]() ![]() 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.
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