Peter S.
Topic Author
Posts: 5
Joined: Fri Aug 31, 2001 2:51 pm

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 9:28 am

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
 
Guest

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 9:32 am

The B777's engines are very powerful and fast. They use less fuel, and are more "green friendly" than the other aircrafts' engines.
 
timz
Posts: 6163
Joined: Fri Sep 17, 1999 7:43 am

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 9:58 am

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.
 
CPDC10-30
Posts: 4681
Joined: Wed Feb 02, 2000 4:30 pm

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 10:05 am

Twins need to have a higher reserve power because of the possibility of engine failure. The 777 is not an inefficient aircraft.
 
cedarjet
Posts: 8103
Joined: Mon May 24, 1999 1:12 am

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 11:05 am

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
 
rw774477
Posts: 1020
Joined: Wed Feb 14, 2001 4:15 am

Re: Is The Boeing 777 Efficient

Thu Oct 11, 2001 12:01 pm

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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