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

In m.p.h.?

In m.p.h.?

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

Paul

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

Paul

Conversion:

Empty: 172.617 MPH

Full: 212.8943 MPH

Empty: 172.617 MPH

Full: 212.8943 MPH

Thanks alot guys, for the info

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.

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.

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.

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

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.

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.

For those that are interested...

1nm = 1.853 km

1 mile = 1.6 km

So my figure above of 200 kts = 231mph

Cheers

B744

1nm = 1.853 km

1 mile = 1.6 km

So my figure above of 200 kts = 231mph

Cheers

B744

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?

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.

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.

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

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