Aviation explained: Take-off performance

When preparing for a flight, we always plan for the worst-case scenario, and that is an engine failure at the most critical moment during take-off. We must either be able to stop the aircraft safely, or we must be able to continue the take-off and climb to a safe altitude.
We have to consider a long list of variables, and if we had done the calculations manually, we would never have been able to depart because the conditions can change faster than we are able to revise our calculations. Thankfully, there are more some better methods...
This video is based on ATR 72 performance data, but the principle is valid for all transport category airplanes.
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Attributions:
Smithsonian Channel: F-18 landing https://www.youtube.com/watch?v=lM8GJaFeG0U

Видео Aviation explained: Take-off performance канала Fly with Magnar