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Forum Home > General Discussion > Calculating Takeoff and Landing Distance

Aviagroup Eduard
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Posts: 74

Student question:

"How realistic are published takeoff and landing distances for light GA airplanes?"

Our answer:

This varies dramatically from one airplane type to another, among similar airplanes, and even in the same airplane under different circumstances.


What I suggest is that you compute the takeoff and landing distances in the ways you normally operate the airplane. Apply at least a 50-percent margin for less-than-perfect pilot technique or runway conditions. Now you know what’s normal for you in that airplane.


If you plan to do anything different from your normal - add a couple of passengers, take off at a higher density altitude, use a grass runway - compute the performance under those conditions, to the extent POH performance data exists, and apply at least a 100-percent margin (double the distances).


I use the 50-foot obstacle clearing distances, not the ground roll distances, as my deciding factor.


One last note: obtaining book performance requires you use the book technique. Most POH takeoff and landing data actually reflect short-field performance: Stand on the brakes until full throttle for takeoff; power off for a steep 1.3 times Vso approach on short final for landing. If the runway lengths are short enough that you need to double-check the airplane’s performance, you need to use the book takeoff and landing techniques.

July 21, 2020 at 8:41 AM Flag Quote & Reply

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