707fan
Topic Author
Posts: 29
Joined: Sat Jun 09, 2001 6:10 am

Takeoff And Landing Speeds B-747

Tue Dec 27, 2005 2:08 am

Could someone tell me the various takeoff-speeds of a Boeing 747-400 for the various weights, shown in increments from empty aircraft (400.000 pounds) to fully loaded aircraft (880.000 pounds).
Given: 20 deg. celsius, dry runway at sea level and flap 10.

If the flap is 20, how much is the speed decreased ?

What is the maximum landing weight ?
What is the landing-speed for the various weights using max flap ?

How much is the speed increased for each 1000 feet ASL ?

Does somebody know a link where I could find the above information ?
 
Qantas744er
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Joined: Sat Jun 04, 2005 4:36 am

RE: Takeoff And Landing Speeds B-747

Tue Dec 27, 2005 9:28 am

hey, well lets say 550,000 Lbs Takeoff weight, flaps 10 would be about 120V1
140VR and 148V2. Flaps 20 decreases the Speeds by about 10 knots, it gives a shorter takeoff roll, better lift at a slower speed giving less stress to the gear etc. The avdvantage of flaps 10 is that after the longer takeoff roll the plane will lift of with a bigger climb rate than with flaps 20, but producing more stress to the gears, flaps 10 is often used against noise, because the plane climbs quicker.

Please Correct me if Wrong  Smile

Cheers Leo
Happiness is V1 in Lagos
 
PhilSquares
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Joined: Sun Mar 28, 2004 6:06 pm

RE: Takeoff And Landing Speeds B-747

Tue Dec 27, 2005 9:58 am

All of the information you want is really kept on the aircraft, at least at SQ. However, a V2 of 187 sticks in my mind for MTOW.

20 flap takeoff will lower your V speeds by anywhere from 5-8 knots, IIRC. As pointed out earlier, 20 flaps gets more weight off a given runway, but 10 flaps provides more weight in the climb (better climb performance).

Max landing weight is MTOW. The 744 can do an overweight landing. However if you're talking about "normal" landings it varies depending on the weight the operator bought from Boeing. At SQ, we have landing weights from 285,763 kgs or 302,092 kgs
Fly fast, live slow
 
User avatar
CCA
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Joined: Wed Oct 02, 2002 7:29 pm

RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 1:29 am

Quoting 707fan (Thread starter):
Could someone tell me the various takeoff-speeds of a Boeing 747-400 for the various weights, shown in increments from empty aircraft (400.000 pounds) to fully loaded aircraft (880.000 pounds).
Given: 20 deg. celsius, dry runway at sea level and flap 10.

Sorry not on the -400 but here are some -200 figures (in kgs) which should be in the ballpark.
WT/VR/V2
380/180/188
370/177/185
360/173/182
350/170/179
340/166/175
330/162/172
320/159/169
310/155/166
300/151/163
290/146/159
280/142/156
270/140/155
XXX/ " / "
200/140/155

Quoting 707fan (Thread starter):
If the flap is 20, how much is the speed decreased ?

As said by Phil, the figures I've got it's about 7kts but below 290T the speeds are VR=140 & V2=152

Quoting 707fan (Thread starter):
What is the maximum landing weight ?

285,762kg

Quoting 707fan (Thread starter):
What is the landing-speed for the various weights using max flap ?

WT/VREF
317/163 above this weight the flap will load relief to F25 due to the higher speed, load relief begins at 165kts. 290T is about the max (overweight) for F30 if you're flying at Ref +10 =164 you're on the verge of load relief.
310/161
300/157
290/154
280/150
270/146
260/143
250/140
240/137
230/134
220/131
210/128
200/125
190/122
180/118

F25/VREF
317.1/169

320/170
330/173
+10/+3
380/188
P1 in A330, A340, A346, B742, B744, B748.
 
phollingsworth
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Joined: Sat Mar 06, 2004 6:05 am

RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 1:53 am

Quoting 707fan (Thread starter):
What is the landing-speed for the various weights using max flap ?

Anyone have the 0 Flap setting landing speeds for the 744 at any weight?
 
julesmusician
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Joined: Sun Aug 28, 2005 3:25 am

RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 6:11 am

Your thread got me thinking, so I did a full overweight landing on the 747-400 on flight sim. With 20 flaps about 180knots would just about keep it manageable, but without much safety margain. With no flaps it was 200 knots or there about, mind you I was impressed even at that speed with MAX autobrake it stopped very quickly. Unfortunately on flight sim you don't get all the fire trucks coming out after you from such a landing to put out the brakes on fire  Smile
African Civil Aviation Commission president "You don't want to fly out as a passenger and come back as cargo."
 
julesmusician
Posts: 378
Joined: Sun Aug 28, 2005 3:25 am

RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 6:38 am

Yep 200 knots on landing with no flaps (see speed above)

http://www.jules-pages.pwp.blueyonder.co.uk/747400hsland.JPG
African Civil Aviation Commission president "You don't want to fly out as a passenger and come back as cargo."
 
phollingsworth
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Joined: Sat Mar 06, 2004 6:05 am

RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 6:44 am

Quoting CCA (Reply 3):
250/140


So a CLmax of ~ 2.0 for Flaps 30

Quoting CCA (Reply 3):
270/140/155

This equates to a CLmax of ~ 1.7 for Flaps 10
 
PhilSquares
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RE: Takeoff And Landing Speeds B-747

Fri Dec 30, 2005 2:26 pm

Quoting Julesmusician (Reply 5):
With 20 flaps about 180knots would just about keep it manageable, but without much safety margain.

Flaps 20 isn't a landing flap. It's either 25 or 30. I don't have the performance manual with me but IIRC at MTOW your Vref would be around 185KIAS or so.
,

Quoting Phollingsworth (Reply 4):
Anyone have the 0 Flap setting landing speeds for the 744 at any weight?

There is no 0 flap landing on the 744. In fact, I reviewed our QRH and there's no 0 flap checklist. As long as you have electrics or hydraulics you're all set.
Fly fast, live slow
 
707fan
Topic Author
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Joined: Sat Jun 09, 2001 6:10 am

RE: Takeoff And Landing Speeds B-747

Tue Jan 03, 2006 4:55 pm

Thanks to all of you for your contribution. Especially til PhilSquares

-- 707fan
 
phollingsworth
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Joined: Sat Mar 06, 2004 6:05 am

RE: Takeoff And Landing Speeds B-747

Wed Jan 04, 2006 7:56 am

Quoting PhilSquares (Reply 8):
There is no 0 flap landing on the 744. In fact, I reviewed our QRH and there's no 0 flap checklist. As long as you have electrics or hydraulics you're all set.

Makes sense and if you don't have either electrics or hydraulics you probably are not going to worry about landing speed all that much. However, what happens if you have a flap structural failure, in the vein of DL dropping an outboard 767 flap in Dallas a decade or so ago.

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