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Takeoff And Landing Speeds B-747  
User currently offline707fan From Norway, joined Jun 2001, 36 posts, RR: 2
Posted (8 years 11 months 4 weeks 18 hours ago) and read 32767 times:

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 ?

10 replies: All unread, jump to last
 
User currently offlineQantas744ER From United States of America, joined Jun 2005, 1295 posts, RR: 4
Reply 1, posted (8 years 11 months 4 weeks 11 hours ago) and read 32767 times:

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
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 2, posted (8 years 11 months 4 weeks 10 hours ago) and read 32767 times:

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


User currently offlineCCA From Hong Kong, joined Oct 2002, 846 posts, RR: 14
Reply 3, posted (8 years 11 months 3 weeks 4 days 19 hours ago) and read 32767 times:

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



C152 G115 TB10 CAP10 SR-22 Be76 PA-34 NDN-1T C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F
User currently offlinePhollingsworth From United Kingdom, joined Mar 2004, 825 posts, RR: 5
Reply 4, posted (8 years 11 months 3 weeks 4 days 18 hours ago) and read 32767 times:

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?


User currently offlineJulesmusician From , joined Dec 1969, posts, RR:
Reply 5, posted (8 years 11 months 3 weeks 4 days 14 hours ago) and read 32767 times:

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

User currently offlineJulesmusician From , joined Dec 1969, posts, RR:
Reply 6, posted (8 years 11 months 3 weeks 4 days 14 hours ago) and read 32767 times:

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

http://www.jules-pages.pwp.blueyonder.co.uk/747400hsland.JPG


User currently offlinePhollingsworth From United Kingdom, joined Mar 2004, 825 posts, RR: 5
Reply 7, posted (8 years 11 months 3 weeks 4 days 13 hours ago) and read 32767 times:

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


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 8, posted (8 years 11 months 3 weeks 4 days 6 hours ago) and read 32767 times:

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.


User currently offline707fan From Norway, joined Jun 2001, 36 posts, RR: 2
Reply 9, posted (8 years 11 months 3 weeks 3 hours ago) and read 32767 times:

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

-- 707fan


User currently offlinePhollingsworth From United Kingdom, joined Mar 2004, 825 posts, RR: 5
Reply 10, posted (8 years 11 months 2 weeks 6 days 12 hours ago) and read 32767 times:

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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