Aircraft Operating Instructions (AOI)
Type:
CT
Series:
CTLS
LSA
Page: 5-9
AU 010 11000
Revision No. 4
Date: 29 Apr 2008
5.5.2.
Influences to take-off distance
Take-off performance for conditions different to the ones named before can be
estimated by using the following rules of thumb. Again the basis is an aircraft in good
condition and a well trained pilot.
Influence
Increase of take-off roll
distance
Increase of take-off
distance
high grass 8 in (20cm)
app. 20% ( = x 1.2 )
app. 17% ( = x 1.17 )
Flaps 0° instead of 15°
app. 10% ( = x 1.1 )
app. 20% ( = x 1.2 )
2% inclination of runway
app. 10% ( = x 1.1 )
app. 10% ( = x 1.1 )
4% inclination of runway
app. 14% ( = x 1.14 )
app. 12% ( = x 1.12 )
tail wind 5 kt
app. 20% ( = x 1.2 )
app. 25% ( = x 1.25 )
wet snow
app. 30% ( = x 1.3 )
n/a
soaked soil (1.2 in (3cm) deep)
app. 16 % ( = x 1.16 )
n/a
Each factor occuring at a time has to be considered individually.
Example: Takeoff at 1.100 lb (500 kg) at 68 F (20°C) at 2000 ft (600 m) pressure
altitude in high grass with a runway 2% inclination. As by chapter 5.2 density altitude
for this case is 3000 ft (900m). Takeoff charts show a take-off roll distance of 620 ft
(190 m) and a take-off dictance of 1.120 ft (340 m). Consideration of the deviating
factors delivers: Take-off roll = 620 ft x 1.2 x 1.1 = 820 ft (250 m) and Take-off
distance = 1.120 ft x 1.17 x 1.1 = 1.440 ft (440 m). Easy to see that just using the
field elevation (200 ft) would have delivered values by 40% too low.
