Ground speed * 5 or Ground speed / 2 add zero
Example: 200 * 5 = 1000fpm or 200/2 = 100 * 10 = 1000fpm, I find dividing by 2 faster then multiplying by 5
Starting alt – Desired alt = delta feet x 3 = distance in feet / 1000 = NM
Example: 20,000ft – 10,000ft = 10,000ft x 3 = 30,000ft / 1000 = 30 NM
Ground Speed (GS) (knots) / 60 * Climb Gradient (Feet Per Mile)
75 / 60 * 600 = 750ft/min
Distance off track = (number of degrees off course x distance to station) / 60
1nm = (1deg X 60nm) / 60
Maximum drift angle (Max Drift) = Windspeed divided by Groundspeed in miles per minute
10nm / (120nm/h / 60min) = 5deg
Reources:
- https://www.thinkaviation.net/top-of-descent-calculation/
- https://www.skybrary.aero/articles/rules-thumb
Ground speed / 60 * Gradiant
75kn/h / 60min * 400ft/kmile = 500ft/m
Resources: