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Re: Is The Boeing 777 Efficient  
User currently offlinePeter S. From Canada, joined Aug 2001, 5 posts, RR: 0
Posted (12 years 10 months 4 weeks 1 day 21 hours ago) and read 2138 times:

I recently took a trip to London on a Boeing 777 and was amazed at the engines not only in power but the size. I started to try and figure out whether all that power was necessary for that aircraft and whether it wasted unnecessary fuel. I started comparing it to other aircraft mainly the 747, the A340 and the proposed A380. I took the maximum thrust of all the engines combined on each aircraft and compared it to their maximum takeoff weight. The results are in the form of lbs of thrust for each lb of weight.

777=.31
747= .29
A340=.22
A380=.23

Without making this a Boeing vs. Airbus arguement, can it be argued that the engines for the 777 are too powerful and thus burn more fuel than is necessary thus reducing potential profits for airlines. Could this also explain why many people feel that the A340 is underpowered as well as the A380. Comments and insight are welcome. I got the weight and engine thrust from their respective websites.

Peter

5 replies: All unread, jump to last
 
User currently offlineSoaring Spirit From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 10 months 4 weeks 1 day 21 hours ago) and read 2117 times:

The B777's engines are very powerful and fast. They use less fuel, and are more "green friendly" than the other aircrafts' engines.

User currently offlineTimz From United States of America, joined Sep 1999, 6822 posts, RR: 7
Reply 2, posted (12 years 10 months 4 weeks 1 day 21 hours ago) and read 2098 times:

Twins compare with twins, and quads compare with quads. Most any twin has more thrust-per-pound than most any quad, for well-known reasons.

User currently offlineCPDC10-30 From United Kingdom, joined Feb 2000, 4781 posts, RR: 23
Reply 3, posted (12 years 10 months 4 weeks 1 day 21 hours ago) and read 2093 times:

Twins need to have a higher reserve power because of the possibility of engine failure. The 777 is not an inefficient aircraft.

User currently offlineCedarjet From United Kingdom, joined May 1999, 8093 posts, RR: 54
Reply 4, posted (12 years 10 months 4 weeks 1 day 20 hours ago) and read 2072 times:

Incredibly efficient aircraft. All the aircraft you compared it to are quads, which need much less reserve power margins (as stated above). But to continue the thought, compare it to other twins. I bet the 757 and A310 are more powerful and the 767 and A330 are comparable.


fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz
User currently offlineRw774477 From United States of America, joined Feb 2001, 1070 posts, RR: 0
Reply 5, posted (12 years 10 months 4 weeks 1 day 19 hours ago) and read 2047 times:

777's must be able to climb out on 1 jet ( after 1 failure ) - the others must do it on 3 jets - hence the larger single unit

rw774477


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