View Full Version : B747 takeoff distance
Santiago60
24th Aug 2019, 14:58
Hi everyone,
Since I don’t have a B-747 performance manual, can anyone Tell me what Would be te takeoff distance for a flap 10º and 20º setting please?
Airport elevation ...2,100 Ft
Temp......................15ºc
Altimeter ..............30.20
Wind.......................calm
Runway grad..........0%
Runway dry
TOW......................300,000 Kg
TOGA
Thanks
phil@LFPG
1st Oct 2019, 04:31
maybe easier with the name of the airport.
Santiago60
1st Oct 2019, 12:54
Thank you Phil@...
It coluld be any airport , although I know is not the same. Let’s try Tenerife (GCXO). I will apreciate your help.
Regards
phil@LFPG
2nd Oct 2019, 02:09
clear your inbox if you want some infos ...
GCXO 12, TODA 3171m. Same for both flaps 10 and 20.
Data from Boeing OPT, CF6-80C2B1F
Santiago60
5th Oct 2019, 22:35
Thanks so much Duffo,
How about the Takeoff run from runway 30? In other words, as you well know, the distance from brakes off until main wheels leave the ground? I bet that you may get about 200-300ft less ground distance if using flaps 20. That is my guess.
I’ll appreciate your response.
Best regards
R30, Flaps 20, All engines go 2988m, engine out go 3023m, toda same 3171m.
Flaps 10 AE-go 3094m, EO-go 3128m.
harrryw
6th Oct 2019, 09:40
Magadi airport el 2100 ft
GXCO is only 170m
Santiago60
6th Oct 2019, 12:31
Dufo:
You nail it!
Once again, thank you very much! You can’t imagine how long I was waiting for this response.
My suspicios were correct...with flaps 20, the ground run is 347 ft shorter than using flaps 10.
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Harryw,
If I understand correctly, the GCXO (Los Rodeos airport) has an elevation of 633 m , 2077 ft. Correct me If I’m wrong.
Thank you
harrryw
6th Oct 2019, 13:51
Dufo:
You nail it!
Once again, thank you very much! You can’t imagine how long I was waiting for this response.
My suspicios were correct...with flaps 20, the ground run is 347 ft shorter than using flaps 10.
********************************************************
Harryw,
If I understand correctly, the GCXO (Los Rodeos airport) has an elevation of 633 m , 2077 ft. Correct me If I’m wrong.
Thank you
(IATA (https://en.wikipedia.org/wiki/IATA_airport_code): TFS, ICAO (https://en.wikipedia.org/wiki/ICAO_airport_code): GCTS), also known as Tenerife South–Reina Sofía Airport[ is the main airport of tenerriffe (https://en.wikipedia.org/wiki/Tenerife_South_Airport#cite_note-3)
You are correct though for the other
Santiago60
6th Oct 2019, 16:23
Thank you harryw,
Cheers