Takeoff roll longer at heavier weights?
Hello,
Every pilot always tries to use FLEX to save some engine years and money...
This about performance is very interesting but quite hard subject...
The REAL problem for me for the moment is following:
I have seen many TKF: s in my life and EVERY one uses a lot of runway when they
are heavy...
Here are some examples:
A332 360 pax and flight time of 3 h. The plane is far away from MTOW (The weight use to be around 180T)and FLEX
probably almost to the max...Doesn't matter, it still shouting of the runway like h**l and
is in the air after only 1300 m.
A332 370 pax and flight time of 5 h. The plane weighted about 190T and was
a bit under MTOW...Used much FLX again and was in the air after 1800m...
BUT here the real dicey one come...
A333 400 pax and flight time of 6 h...It's of course MAX PAYLOAD and fuel
use to be max at 45T.
MZFW is 173T
Fuel 45T
MTOW (wich should be possible): 218T
This flight rolls for about 2400-2500m EVERY TIME!!!!
The plane only weights 218T....Saw a movie about an Austrian flight from PEK to VIE. The flight time was 10 h 17 min and they were at MTOW.
Temp was 8C
QNH was 1009
Wind...almost nothing...
They took of from the 4000 m runway with FLX 41.They used about 2500 m of the
runway, wich is quite a lot for being ROLL distance.
You can clearly se above that the weight (example A332) made a difference in roll.
But if you look at the last 2 ones. The A333 examples. You se that they have the
same roll distance...And if calculated it right the difference between the planes is
12T and 0 Metres in dif!!! How is that even possble?
Can the A333 go with MTOW anyway even if the MZFW is 173 T?
Thanks!!
//Robini