Mental math calculations in the cockpit?

[Eagleflip]

Whoops, you are correct Profile--it is 10%....


I suffer from math lysdixia....duh!

 

[alimaui]

Okay very important mental math problem here (NOT!) but interesting....

Most of the time we descend gradually...on an ILS 3deg but for those of you who land so hard it feels like you are dropping out of the sky here is how you can figure out "how far you were dropped from"

*since no "square" sign anything squared will be shown as sq. ie Vsquared will be shown as Vsq


H=Vsq/231580

Where V=vertical speed in ft/min
H=Height in feet from which the aircraft could be dropped from to create the same intensity of touchdown

To Derive

V Finalsq=V initialsq + 2ad

Where V Final = Touchdown speed
V Initial = Zero (dropped from still)
a = acceleration (9.81 meters/second sq)
d = height (h) we are solving for


Have fun....

Ali