HKA
Topic Author
Posts: 142
Joined: Thu Jan 12, 2006 7:44 am

Why A330 Engines Smaller Than B772

Tue Mar 07, 2006 6:50 am

I was wondering why the twin engines of A330 are smaller than those of B772.

Both carry the same # of passengers and are of same size approx.

Is it because B772 has a longer range ?
 
Glom
Posts: 2051
Joined: Sat Apr 23, 2005 2:38 am

RE: Why A330 Engines Smaller Than B772

Tue Mar 07, 2006 6:58 am

The 772 actually has less range. It has to do with the fact that the 777 is optimised for long haul and so is a heavy bastid on A market routes. Similarly, the A330/340 was optimised for medium haul, which is why the A340 is a heavy bastid on B and C market routes. The rest is history.
 
egnr
Posts: 408
Joined: Sat Feb 07, 2004 8:31 am

RE: Why A330 Engines Smaller Than B772

Tue Mar 07, 2006 7:06 am

The B777 is a physically larger aircraft than the A330. Even the baseline B772 weighs more than the highest weight A333 available both when empty and at max takeoff weights.

B772 data
B773 data
A332 data
A333 data

The A330 does not need larger engines, and the B777 engines would be an extremely tight squeeze between the A330 wings and the ground (if they'd fit at all).
7late7, A3latey, Sukhoi Superlate... what's going on?
 
Molykote
Posts: 1237
Joined: Tue Aug 23, 2005 8:21 pm

RE: Why A330 Engines Smaller Than B772

Tue Mar 07, 2006 12:57 pm

Are you asking about thrust output, size, or both?
Speedtape - The aspirin of aviation!
 
Qantas744er
Posts: 1162
Joined: Sat Jun 04, 2005 4:36 am

RE: Why A330 Engines Smaller Than B772

Tue Mar 07, 2006 8:20 pm

The 777-200A has less range than the 340-300
The 777-200ER has more than the 340-300
The 777-200LR has more than the a 340-500
The 777-300A has less range than the 340-300
the 777-300ER has more range than the 340-600
You live and you die, by the FMA
 
Mir
Posts: 19108
Joined: Mon Jan 05, 2004 3:55 am

RE: Why A330 Engines Smaller Than B772

Wed Mar 08, 2006 1:39 am

Quoting Glom (Reply 1):
The 772 actually has less range.

Unless you're talking about the 777-200 (non-ER), I'd doubt that.

-Mir
7 billion, one nation, imagination...it's a beautiful day
 
prebennorholm
Posts: 6443
Joined: Tue Mar 21, 2000 6:25 am

RE: Why A330 Engines Smaller Than B772

Wed Mar 08, 2006 9:24 am

Quoting HKA (Thread starter):
I was wondering why the twin engines of A330 are smaller than those of B772.

Both carry the same # of passengers and are of same size approx.

Wrong.

330 = approx. 120 tons empty, max single class pax capacity 440.
773 = approx. 160 tons empty, max single class pax capacity 550.

The 777 is a 25-30% bigger plane and therefore needs 25-30% more powerful engines. 773A = roughly 90k lbs and 333 roughly 70k lbs engines.

The new ultra long range 777 versions take along a lot more fuel load and therefore needs another 25% more power.
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