Mr.BA
Topic Author
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B744 Climb

Tue Oct 02, 2001 8:49 pm

Hi everyone,

I came across this question when I am playing my FS 2000 B747-400 proffesional pack.

At what Vspeed and IAS generally does a B747-400 climb when it took off from maximum take-off weight in reality? On my FS2K, I am about half of the maximum take-off weight of the B744, climbing to FL350, only passing 15,000 feet and with a IAS of 270 knots, I am at full power. If this is the case, how does the B747-400 climb in reality with full weight? And, I virtually cannot climb when I took off on Maximum take-off weight but in reality I see those close to MTOW B744s can climb at a reasonable rate. Or is it just FS2K inaccuracy?

Can someone explain to me what are the procedures to climb a B744, may it be light or heavy? I would really love to know.

Thanks a lot

alvin
Boeing747 万岁!
 
AJ
Posts: 2295
Joined: Wed Nov 03, 1999 3:54 pm

RE: B744 Climb

Wed Oct 03, 2001 8:25 am

Hi Alvin,
In reality a heavy B744 would only just be completing flap retraction at 270kts.
Depending on the cost index being used for the flight an economy climb would be at about 340kias, transfering to M0.84 or so in the higher levels. The local ATC 250kias below 10,000' does not normally allow economic climb at high weights.
By 'half Max Takeoff' what do you mean?
Cheers,
AJ.
 
nbirger
Posts: 69
Joined: Tue Mar 13, 2001 4:03 pm

RE: B744 Climb

Wed Oct 03, 2001 10:37 am

Hello,

From what I have read the 744's intermediate climb is at 310KIAS. I believe the 744's economy climb speed is between 300-340KIAS.

I also remember reading somewhere that ATC usually give the 747's special clearance to climb at faster speeds under 10,000'.


Hope this helps,
-Nick
 
Mr.BA
Topic Author
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RE: B744 Climb

Wed Oct 03, 2001 3:13 pm

Thanks for the replies. Hmm.. 300-340ias is really fast I think.

AJ, half take off means that I took the B744 off with only half the weight of a full B744.

alvin
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AJ
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RE: B744 Climb

Wed Oct 03, 2001 3:53 pm

Hey Alvin, considering the average zero fuel weight of a B744 on a commercial operation is about 220 T, and you'd want at least 30 T of fuel you are looking at a minimum weight of about 250 T out of a possible 397 T. To be realistic half weight of 200 T is very light!
 
Guest

RE: B744 Climb

Wed Oct 03, 2001 7:36 pm

Hi AJ,

Why do u need a min of 30T of fuel? 30T can last around 2hrs for a trip inclusive of t/o and landing.

-Regards, VA
 
AJ
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RE: B744 Climb

Thu Oct 04, 2001 9:15 am

30T is our minimum flight load to prevent fuel pump uncovering in all flight regimes, critically in an aborted take off, when you don't want to have all the fuel flow forward and uncover the pumps, shutting the engines down when you need full reverse!
 
Guest

RE: B744 Climb

Thu Oct 04, 2001 7:25 pm

Hi AJ

I see, cool, so you're saying that the 747 has to take off with a min of 30T to prevent problems during RTO.

Wow I didnt know that I always thought aircraft could take off with just suffice fuel for the journey plus extras for diversion.

Thanks for the info  Smile/happy/getting dizzy Greatly appreciated.

-Regards, VA

 
Mr.BA
Topic Author
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RE: B744 Climb

Fri Oct 05, 2001 1:13 am

Great info AJ... I didn't know that too. Interesting  Smile

Thanks everyone again

alvin
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KU104
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RE: B744 Climb

Fri Oct 05, 2001 5:00 am

For what its worth I have asked many pilots about what V-speed and IAS to use on climb. Usually they say it depends on the weight of the Aircraft. The average say for a 6 hour trip on an A340 that is 3/4 full is 2100FPM. Also on takeoff you need a high trim number say about +7 or +8. ON FS2K this would give you a climb speed of 180kts with 20degree flaps, and 2500fpm and N1 at 92% (I never use full power as pilots say it reduces engine "wear & tear" and increases engine performance and life. You can tell most my flights are as realistic as possible lol). That is what I normally use and it is a believable climb speed. Stepping up the altitude I use 250 until 10000ft. Then 290 until FL250 (trim would still be at Take-off setting) I switch to Mach and let it hold 0.80 (on a 744) until it reaches a stable fuel flow. Finally let her climb to cruise altitude and set the cruise Mach. This is all depending in info I gathered and what I do to complete succesful flights on FS.
 
747-400Buff
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Joined: Mon Jul 16, 2001 2:14 pm

RE: B744 Climb

Fri Oct 05, 2001 8:20 am

Hi Alvin

Nice to meet another fellow flight simmer....

As many others seem to have responded to your question I will not bore you by repeating the answers of others. I will however, only point you in the direction of an EXCELLENT (sorry mate, but I have NO affilliation with this site and this is NOT a paid commercial) Website, that REALLY teaches you to fly the 747-400 .

Aerowinx.com

The guys there are real gurus when it comes to technical questions...even if you DONT fly their software (It's designed for commercial pilots who want to upgrade their rating to a 747-400) feel free to ask your questions of them anyway

Regards
Fellow simmer
Dave Hollingsworth
Perth
Australia
 
AJ
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RE: B744 Climb

Fri Oct 05, 2001 8:38 am

Hello Dave,
I would second the Aerowinx recommendation, I use the program to prepare for my simulator sessions!
Cheers,
AJ.
 
747-400Buff
Posts: 43
Joined: Mon Jul 16, 2001 2:14 pm

RE: B744 Climb

Fri Oct 05, 2001 4:39 pm

Hi AJ

Aerowinx (PS1.3a) is the ONLY flight sim I now fly...
...and YES, I'm a registered user too!! 8o)

Regards
Dave
 
Mr.BA
Topic Author
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RE: B744 Climb

Fri Oct 05, 2001 8:44 pm

Thanks all again. Nice to meet more simmers here too. The Aerowinx thingie? I have it in my computer now... really cool... one point is that I can't set it to clear weather and maximum visibility.

alvin
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AJ
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Joined: Wed Nov 03, 1999 3:54 pm

RE: B744 Climb

Sat Oct 06, 2001 7:40 am

The Aerowinx sim is more of a procedural trainer, designed for 'real thing' type training. Don't expect to fly under the Harbour Bridge etc. in this one. The outside graphics consist of permently darkened runways and poor weather!
The inside graphics, however, are excellent.
 
Mr.BA
Topic Author
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RE: B744 Climb

Sat Oct 06, 2001 11:52 am

I agree AJ, this software is really a good one, almost like a real 747-400. Sometimes I thought, if only they had the graphics of FS, it would really be fantastic.  Smile

Anyway, anyone knows if there are going to come up with a B777 one?

alvin
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ryu2
Posts: 1546
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RE: B744 Climb

Sat Oct 06, 2001 12:48 pm

There's a addon for PS1 called Scenery Injector that lets you connect it to a second computer running FS2000 to generate the scenery views, so you can have the best of both worlds -- PS1 realism and FS2000 graphics.

Sounds great -- I only wish I had a second computer!
 
Mr.BA
Topic Author
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RE: B744 Climb

Sat Oct 06, 2001 6:27 pm

Thanks for the info Ryu... too bad I don't have a second computer too.  Sad

alvin
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