Peter S. From Canada, joined Aug 2001, 5 posts, RR: 0 Posted (12 years 5 months 5 days 2 hours ago) and read 2049 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.
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.
Cedarjet From United Kingdom, joined May 1999, 7894 posts, RR: 54
Reply 4, posted (12 years 5 months 5 days ago) and read 1983 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