ground speed will indicate 450 feet per minute, while a jet following that same gradient at 240 knots ground speed will show a vertical speed of 1,200 feet per minute.
You can convert feet per mile to feet per minute by placing the rate arrow opposite to the ground speed, finding the feet per minute value on the outer scale lined up with the feet per mile value on the middle scale. Try these two examples:
1.Set the rate arrow opposite of 90.
2.Find 300 feet per mile on the middle scale (see Figure 16).
3.The climb rate in feet per minute, 450, is found on the outer scale opposite of 300.
1.Set the rate arrow at 240 knots.
2.Look above 300 on the middle scale.
3.You should find a vertical speed of 1,200 feet per minute.
Figure 16
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