Calculations take off and landing

In the previous article (aircraft performance) we dived into performance factors and performance limiting factors. Now we have to tie it all together by making a few calculations more in conjunction with runway lengths, states and surfaces. Some performance data sheets found in the POH give a clue how to calculate with these limiting factors. If these variables are not stated in the POH, a table (underneath) can be used as an helper but it needs to be noted that this figures mentioned are not official reference material in any kind.


Factor Parameters Take off Landing
% x % x
Weight 10% more +20 +1.2 +10 1.1
10% less -10 0.9 -5.0 0.95
Altitude < 3000 ft / 1000ft +10 1.1 +5.0 1.05
> 3000 ft / 1000ft +20 1.2 +10 1.1
Temperature < 15˚C / 10˚C -10 0.9 -5.0 0.95
> 15˚C / 10˚C -10 1.1 +5.0 1.05
Runway Grass (< 10 cm) +20 1.2 +20 1.2
Grass (10-20 cm) +25 1.25 +30 1.3
Surface Wet +5 1.05 +10 1.1
Water (< 1 cm) +30 1.3 +30 1.3
Soft wet +50 1.5 +50 1.5
Dry snow (< 8 cm) +25 1.25 +25 1.25
Wet snow (< 5 cm) +50 1.50 +50 1.50
Slope 1˚ up +10 1.10 -5 0.95
1˚ down -5 0.95 +10 1.10
Wind 10 kts head -10 0.90 -10 0.90
Wind 10 kts tail +10 1.10 +10 1.10
No flaps +30 1.30
Additional OPS +33 1.33 +43 1.43

Take off performance calculations

Take off calculations

Landing performance calculations

Landing calculations

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