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AF330

How do we calculate ft/nm?

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At a ground speed of 60 knots, your VS in FPM equals ft/nm. You can compute the ft/nm FPM by taking the ratio of your ground speed to the 60 knot baseline.

 

400ft/nm at 60 knots ground speed equals 400fpm.

 

At 120 knots ground speed, you will require 800 fpm.

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