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What Is The Take Off Speed Of A 747?  
User currently offlineGF-A330 From United Kingdom, joined Apr 2001, 1643 posts, RR: 2
Posted (13 years 3 months 3 weeks 1 day 7 hours ago) and read 3147 times:

Does anyone know what the take off speed of a 747 is ?

In m.p.h.?

12 replies: All unread, jump to last
 
User currently offlineSukhoi From Sweden, joined May 2006, 373 posts, RR: 8
Reply 1, posted (13 years 3 months 3 weeks 1 day 5 hours ago) and read 3104 times:

AVERAGE figures for a 744 on an average day

Empty 440,000 lbs with flaps 10 V2 occurs around 150 knots
Full up 875,000 with flaps 10 V2 occurs around 185 knots

Sombody else can do the conversion  Wink/being sarcastic

Paul




User currently offlineRw774477 From United States of America, joined Feb 2001, 1070 posts, RR: 0
Reply 2, posted (13 years 3 months 3 weeks 1 day 5 hours ago) and read 3090 times:

just add 15 %

rw774477


User currently offlineSIA_B777 From United States of America, joined Apr 2001, 469 posts, RR: 1
Reply 3, posted (13 years 3 months 3 weeks 1 day 5 hours ago) and read 3086 times:

Conversion:

Empty: 172.617 MPH
Full: 212.8943 MPH


User currently offlineGF-A330 From United Kingdom, joined Apr 2001, 1643 posts, RR: 2
Reply 4, posted (13 years 3 months 3 weeks 1 day 2 hours ago) and read 3060 times:

Thanks alot guys, for the info

 Big thumbs up


User currently offlinePhilB From Ireland, joined May 1999, 2915 posts, RR: 13
Reply 5, posted (13 years 3 months 3 weeks 1 day ago) and read 3037 times:

Except, of course the average day, in reality, rarely exists and other factors come into play.

Start with the weight, then the temperature, the pressure, any runway slope, wind speed and direction, altitude of the runway and any variables the airline ops manual may throw in for the particular runway.

Nowadays the computer does it all, back in the 1970s it was a set of graphs and a circular slide rule....happy days.


User currently offlineB744 From New Zealand, joined Dec 1999, 491 posts, RR: 0
Reply 6, posted (13 years 3 months 3 weeks 1 day ago) and read 3032 times:

When I used to fly CX to HKG a fair bit, they used to have their 'air show' running during take-off at AKL. Pretty much every time, the ground speed was ~200kts at rotation. This was for a 742 by the way.



User currently offline762er From United States of America, joined Feb 2001, 542 posts, RR: 1
Reply 7, posted (13 years 3 months 3 weeks 23 hours ago) and read 3025 times:

Can anybody answer this question for a fully loaded 767-400? Also, what are the typical flap settings of the 764 on takeoff? Thanks

User currently offlinePhilB From Ireland, joined May 1999, 2915 posts, RR: 13
Reply 8, posted (13 years 3 months 3 weeks 23 hours ago) and read 3012 times:

762er,

You are not grasping the concept. It may be possible to give a take off speed on the "average day" at empty and full, but what does that tell you? Flap settings will also vary.

Calculating take off speed is a very exact science. It isn't a case of "at around 120 we'll call it V1 a bit faster V2 and the book says we could be at VR at around 160.

Each take off is individually calculated and the flap settings (which, I grant you are more likely to fall into a "typical" band) are determined by the performance those calculations call for.


User currently offlineB744 From New Zealand, joined Dec 1999, 491 posts, RR: 0
Reply 9, posted (13 years 3 months 3 weeks 22 hours ago) and read 3002 times:

For those that are interested...

1nm = 1.853 km
1 mile = 1.6 km

So my figure above of 200 kts = 231mph

Cheers
B744



User currently offline762er From United States of America, joined Feb 2001, 542 posts, RR: 1
Reply 10, posted (13 years 3 months 3 weeks 3 hours ago) and read 2981 times:

I'm well aware of all the factors you have to take into account to calculate take off speed. However, there are fairly consistent knots indicated airspeed velocities for an aircraft at full weight. It doesn't vary that much with temperature and altitude. All I'm looking for here is a rough estimate for the rotation velocity of fully loaded 764 at sea level and 70 degrees absent winds give or take a few kias. Why you gotta be so picky and technicl all the time?

User currently offlinePhilB From Ireland, joined May 1999, 2915 posts, RR: 13
Reply 11, posted (13 years 3 months 3 weeks 3 hours ago) and read 2979 times:

Because being picky and technical and ACCURATE is what a sensible answer to a question is all about.

If you wanted to know the question you have finally asked then you should have asked it. If you think take off speed doesn't vary much with temperature and altitude, you need to do more reading.


User currently offline762er From United States of America, joined Feb 2001, 542 posts, RR: 1
Reply 12, posted (13 years 3 months 3 weeks 2 hours ago) and read 2972 times:

I'm just looking for someone to answer my question, not criticize it.

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