a380900
Posts: 801
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A380 Underpowered?

Wed Dec 17, 2003 10:13 pm

I trust people at Airbus to know what they're doing but it seems odd that a 562 tons A380 would have 4 70000lbs engines whereas the 363 tons A340-600 has 4 56000lbs engines.The total thrust of the A380 is 280000lbs and the 777-300ER 230000lbs.

Is the A380 going to be a slow climber like the first generation a340?
 
KLM-MD11
Posts: 429
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RE: A380 Underpowered?

Wed Dec 17, 2003 10:39 pm

here we go again...

this time the A380 in stead of the A340...


yaaaaaaaaaawhn.
GELUK IS GELUL MET EEN K
 
Jkw777
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RE: A380 Underpowered?

Wed Dec 17, 2003 10:43 pm

I agree...  Sleepy

Who cares if its going to be a slow climber?  Insane

I feel that the A340 being a slow climber was part of its character...

Regards,

Justin  Big thumbs up

jkw6210@btopenworld.com or +447751242989
 
a380900
Posts: 801
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RE: A380 Underpowered?

Wed Dec 17, 2003 10:48 pm

Sorry to bore you guys but don't you think that the small difference in engine power is striking? I don't really care about slow climbing although I care about climbing!
 
keesje
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RE: A380 Underpowered?

Wed Dec 17, 2003 10:49 pm

All aircraft have to be certified to do a one engine out take-off and climb after V1 in MTOW, in a bad weather , short runway situation.

Therefor B777, A330, B737 and A320 are "over powered" and 4 engine aircraft like 747, A340 etc underpowered...

As explained many many times before ... but won't prevent some simple mind suggesting it again in a few days ...
"Never mistake motion for action." Ernest Hemingway
 
a380900
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RE: A380 Underpowered?

Wed Dec 17, 2003 10:52 pm

Ok for the 777 but what about the A340-600?
 
kingsford
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RE: A380 Underpowered?

Wed Dec 17, 2003 11:01 pm

A380-900, don't worry, if it doesn't climb, I think they will know before the first commercial flight ...  Laugh out loud
 
ka
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RE: A380 Underpowered?

Wed Dec 17, 2003 11:34 pm

Airbus already announced that the A380 will be reaching faster than its closest competitor (B744) its initial cruising altitude, which will be higher than its competitor´s.
This is all calculated in numerous test and checked in windtunnels. Usually these calculations are very accurate (within a 2% margin).

And, yes, due to the necessary ability of any aircraft to takeoff with one engine failing all twin engine a/c are overpowered in normal operation.

KA.
Keep smiling - you might be on Radar!
 
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EA CO AS
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RE: A380 Underpowered?

Thu Dec 18, 2003 1:07 am

As explained many many times before ... but won't prevent some simple mind suggesting it again in a few days

Keesje, get over yourself.  Insane

The guy was asking a legitimate question. It wasn't like he was Airbus-bashing; he just had a question about the A380's performance. There was no need to be rude.
"In this present crisis, government is not the solution to our problem - government IS the problem." - Ronald Reagan

Comments made here are my own and are not intended to represent the official position of Alaska Air Group
 
longhaulheavy
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RE: A380 Underpowered?

Thu Dec 18, 2003 2:27 am

I don't really care about slow climbing although I care about climbing!

I would think this concern over slow climbing is legitimate, because isn't it true that some airports want you up and out faster than others? (per agreements with residential areas close to airports...)
 
MD80Nut
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A380 Underpowered?

Thu Dec 18, 2003 2:39 am

Wouldn't it be a better idea to wait until the A380 actually flies before worrying about it's rate of climb? Like Kingsford said, I'm sure Airbus will know before the first flight.

Now please correct me if I'm wrong, but I haven't heard about any incident or accident caused by the A340-200/300's supposedly slow rate of climb. If someone can point out an incident or accident were this was a factor I would appreciate it.

cheers, Ralph
Fly Douglas Jets DC-8 / DC-9 / DC-10 / MD80 / MD11 / MD90 / 717
 
dw747400
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RE: A380 Underpowered?

Thu Dec 18, 2003 2:42 am

As discussed before, increased climb performance has a number of benefits, but also has tradeoffs, like most things in aviation. If you climb faster, you can get to a more efficient altitude faster, and get over the more congested air routes faster, hopefully allowing you to take a more direct route. At the same time, bigger engines and wings add weight and drag.

The A380 has an enormous wing, and I think that this will contribute to its climb performance. Additionally, though its thrust to weight ratio is smaller than that of a 747-400 for example, its wing is much larger... 60% larger, for a 40% increase in takeoff weight. That should provide a significant amount of extra lift.
CFI--Certfied Freakin Idiot
 
Greg
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RE: A380 Underpowered?

Thu Dec 18, 2003 2:44 am

It's not underpowered...it's overweight.
I'm sure Airbus will get it right before actualy delivery....
 
Ruscoe
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RE: A380 Underpowered?

Thu Dec 18, 2003 2:54 am

I think this is a legitimate question because of guarantees Airbus have given about climb to height and field performance.

Overall the weight of the 380 will be up about 15 tonnes on takeoff, compared with original estimates, with the same engines, so one can legitimately ask about performance.

However. Airbus have said that the 380 will still meet its guarantees without more thrust.

Ruscoe
 
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Heavierthanair
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RE: A380 Underpowered?

Thu Dec 18, 2003 3:42 am

G'day

Getting it up slowly is one thing, staying up another thing altogether, the latter is far more important, endurance is what counts!  Innocent

Cheers

Peter
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." (Albert Einstein, 1879 - 1955)