ACB777
Topic Author
Posts: 331
Joined: Mon Sep 29, 2003 6:16 am

A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:40 am

I am wondering which aircraft has more engine power: the Airbus A345 or the Boeing 777 with GE - 90 Engines. Does anybody know?
 
gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:43 am

The 345 handily beats all A and B market 777s with any form of GE90 offered.

The 772LR with the GE90-110B1 will offer a bit more thrust - about 8,000 pounds. It has to to meet engine out performance requirements.

The 345 is actually quite overpowered for a 4-engine craft. Airbus did good.

N
 
ConcordeBoy
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Joined: Thu Feb 01, 2001 8:04 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:49 am

No A340 is of any challenge whatsoever to a 777NG when it comes to thrust or thrust ratios. The twinjets win both categories easily.

Also, the higher MTOW 772s compare similarly with the A340 classics.
Faire du ciel le plus bel endroit de la terre c'est impossible sans Concorde!
 
Guest

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:49 am

Definently the B777

The A340-500 is powered by 4 Rolls Royce Trent engines each rated at
54, 000lb of thrust compared to 94,000lb on a B777.

The B777-200LR which will be competing head to head with the A340-500 when it comes into service will have each engine producing 120,000lb of thrust-more than double that of the Airbus model.
 
777236ER
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RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:52 am

It doesn't take a genius to work out that the A340 has TWICE the engines of the 777.

The A345 has more thrust than all 777s apart from the ones with 110,000lb GE90s (772LR, 773ER?)
Your bone's got a little machine
 
gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:52 am

EA777-

Your post didn't make a lot of sense. While of course each individual engine on the 777 is more powerful than each individual engine on the A340, the Airbus does have twice as many.

N
 
dutchjet
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Joined: Sat Oct 14, 2000 6:13 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:53 am

Not really a fair comparison as the A345 has 4 engines and the 777 is a twin - twins must have enough thrust to safely handle one engine out situations and emergencies.

 
ConcordeBoy
Posts: 16852
Joined: Thu Feb 01, 2001 8:04 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:53 am

773ER's engines will produce over 115,000lbs each... 772LR's engines will do either that, or a derated 110,000lbs each
Faire du ciel le plus bel endroit de la terre c'est impossible sans Concorde!
 
gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 9:55 am

In the event that Boeing does offer a 772LR with the GE90-115B1, Airbus is of course prepared to offer the Trent 556 on the 345. Rumor had it that EK was going to take theirs that way, but then it seems they didn't.

They are also planning on hanging Trent 558s or 560s off the A340-600HGW. More details TBA.

N
 
Guest

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 10:00 am

Gigneil

Sorry just spootted my mistake. What I meant to say is that the B777 'classics' have greater power than the A340 'classics', and so is the case with longer-legged versions of both models.

You cannot compare the A340-500 with the B777-200ER. They both operate in different markets. It would make more sence to compare the A340-600 with the B777-200LR
 
gigneil
Posts: 14133
Joined: Fri Nov 08, 2002 10:25 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 10:02 am

Agreed... I tried to in my post. The 772LR does have an 8k lb advantage over the 345.

But as was pointed out - its hard to draw lines. The 772 has that much power because it has to.

N
 
zak
Posts: 1926
Joined: Mon Sep 22, 2003 12:17 pm

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 11:38 am

this thread is so stupid, the engine out requirements make twins have more thrust naturally. it would actually be unwise to load up a quad with engines it doesnt need. even the 340 classics are not as underpowered as many people here indicate, but the airbus flex engine mainteance saving strategy shows alot more with their not too great thrust out of the box then with other planes like the a319.
this thread is the usual comparison of things u cant compare. the 777 has to fly and take off reliably on one engine, quads have 3 engines to do the job, so naturally twins are always by far overpowered compared to quads.
and honestly, who cares about thrust on a civil airliner as long as its safe.
they have a few things to accomplish and "thrust that impresses the aviation enthusiast" is not in that book.
safe and economical operation are the things that determine a modern airliner.
thrust to weight ratios are a topic for the military av forum
10=2
 
dw747400
Posts: 1091
Joined: Wed Aug 15, 2001 8:24 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 12:03 pm

Zak,

Actually, thrust to weight ratios can have an impact on aircraft design. Thrust is, of course, one of that factors that determines climb performance, as well as initial cruise altitude. This is a contributing factor to why the 777-200 has a higher initial cruise altitude than the A340-300 (not sure about the A340NGs vs. 777NGs, so I'm not going to comment other than say I'd guess the situation is the same).

If your flying over a congested area with lots of slow moving 737s and A320s plodding along at Mach .75-.80 at FL310, its faster and more economical to climb over them and take a direct route. Of course, if an aircraft is designed to operate efficiently at a lower initial altitude and you’re not as worried about other traffic, then it doesn’t make sense to carry as much extra thrust.

Again, thrust is far from the only factor involved in climb and cruise, but to say thrust to weight ratios belong in the military forum overlooks some very important considerations.

I know this is a gross oversimplification of things, but thrust does matter!
CFI--Certfied Freakin Idiot
 
zak
Posts: 1926
Joined: Mon Sep 22, 2003 12:17 pm

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 12:42 pm

@dw747400
yes of course thrust matters. but only as a factor to fullfill certain safety limits and to get to whatever is economic.
what exactly is economic for an airline depends on a zillion trillion variables as you also stated and therefore alot of airlines start co using 340 and 777 for example. i am pretty sure we both mean the same thing anyway.
all i wanted to state in the thread is that more thrust doesnt equal the "better" "faster" "whatever" plane, like car ads always imply. and somehow some people also apply that idea to planes, which is really more a thing for the mil av, where speed and such matters more then economical performance.
and since thrust plays a far bigger role in flying performance then in the economical performance of a plane, where its only one of many many factors, i felt i had to chip in that "POWER" isnt what todays airliners are about.
good example is boeings sonic cruiser flop, since more speed didnt mean more overall performance economically (in the opinion of airlines) despite the time savings. etc...  Smile
10=2
 
raivavae
Posts: 81
Joined: Wed Jul 25, 2001 6:56 am

RE: A345 Or 777 - Which One Has More Engine Power?

Sun Nov 30, 2003 2:29 pm

This power is only used during the initial take off sequence, climb and cruise will be at reduced power.

From a pilot point of view, how much power you have is interresting to know when you loose one of them.

and on a quad, you'll still get 3x 54.000 which is more than 120.000 for about the same weight!

i would say that in normal opération a twin is over-powered, but in emergency situations it's under-powered!

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