Pipistrel Virus 912, Flight And Maintenance Manual, Page: 42 / 108

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Headwind
shortens Takeoff and Landing runway length by 8 meters
(25 feet)
with every 5 km/h
(3 kts)
of wind increase (e.g. provided there is a 10 km/h
(6 kts)
headwind on takeoff and landing, dis-
tances will be approximately 16 meters
(50 feet)
shorter then ones published in the manual).
Tailwind
prolongs Takeoff and Landing runway length by 18-20 meters
(60-65 feet)
with every 5
km/h
(3kts)
wind increase (e.g. provided there is a 10 km/h
(6kts)
tailwind on takeoff and landing, dis-
tances will be approximately 36-40 meters
(120-130 feet)
longer then ones published in the manual).
WARNING!
Tailwind affects takeoff and landing performance by more than twice as much as
headwind does.
The table below provides data about the effect of headwind (+) and tailwind (-) on takeoff runway
length.
windspeed (m/s) -3 -2 -1 0 2 4 6
Takeoff runway length [m (ft)]
Model 912 153
(500)
129
(420)
108
(355)
95
(310)
84
(275)
76
(245)
70
(230)
The graph below indicates how takeoff runway length changes when affected by wind.
Rotax 912
50 160
150 500
200 650
100 330
250 820
m ft
0
-4
0 4 8 12 16
-8
kts
takeoff runway length
m/s
-4 -2 0 2
4
6
8
Effect of outside temperature
The table below provides data about the effect of outside temperature on takeoff runway length.
temperature (°C) 13 20 25 30 35
Takeoff runway length [m (ft)]
Model 912 95
(310)
115
(375)
127
(415)
139
(455)
149
(485)
Performance