Filou wrote:He wants to know why a full 747 both with cargo and fuel can not take off at LGG then...
Well let me try to answer it, the simple way:
Every A/C has a maximum structural take off weight MTOW called.
MTOW although can be limited by several factors.
1)Temperature: the lower the temperature, the higher the lift
2)At which hight (compared to sea level), the higher the runway, the lower the average air density, which means less lift.
3) Air pressure, the higher it is the more lift.
4) Issues to the A/C itself which limit MTOW (this means not that the A/C is unsafe)
In the case of runway lenght of LGG, all these factors, give as an result, that a B747 especially at high temperatures during summer, can not reach its MTOW, but is restricted in it.
So means it either can take 5 tons less fuel or cargo (random figure).
To increase TOW, even during high temperature, the A/C needs more speed to create the necessary lift, to reach the higher speed, it needs a
longer Runway.
So in the case, the runway length improvement now in process at LGG, will mean less A/C will me limited in their MTOW, which means more payload-->more profit on a flight
Hopefully this explains it to you all
