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Why A330 Engines Smaller Than B772

HKA From Canada, joined Jan 2006, 147 posts, RR: 1
Posted (7 years 2 months 2 weeks 3 days 14 hours ago) and read 2371 times:

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 ?

6 replies: All unread, jump to last

Glom From United Kingdom, joined Apr 2005, 2803 posts, RR: 10
Reply 1, posted (7 years 2 months 2 weeks 3 days 14 hours ago) and read 2348 times:

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 From United Kingdom, joined Feb 2004, 503 posts, RR: 0
Reply 2, posted (7 years 2 months 2 weeks 3 days 14 hours ago) and read 2337 times:

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 From United States of America, joined Aug 2005, 1336 posts, RR: 30
Reply 3, posted (7 years 2 months 2 weeks 3 days 8 hours ago) and read 2211 times:

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Are you asking about thrust output, size, or both?

Speedtape - The asprin of aviation!

Qantas744ER From United States of America, joined Jun 2005, 1252 posts, RR: 4
Reply 4, posted (7 years 2 months 2 weeks 3 days ago) and read 2107 times:

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

Happiness is V1 in Lagos

Mir From United States of America, joined Jan 2004, 19703 posts, RR: 56
Reply 5, posted (7 years 2 months 2 weeks 2 days 19 hours ago) and read 1997 times:

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 From Denmark, joined Mar 2000, 6017 posts, RR: 55
Reply 6, posted (7 years 2 months 2 weeks 2 days 11 hours ago) and read 1890 times:

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.

Always keep your number of landings equal to your number of take-offs, Preben Norholm

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