DL767captain From United States of America, joined Mar 2007, 2539 posts, RR: 0
Reply 3, posted (7 years 1 month 2 hours ago) and read 19773 times:
I don't think the current 777 engines are enough to power a 747 sized jet on two engines. Maybe something like the engines going on the A350 could work... or maybe the A380... but if they could get enough thrust out of one engine to allow it to be ETOPS certified much like the 777 then it could happen. But they would need to redesign the 747 before this could happen
BA777ER236 From United Kingdom, joined Sep 2006, 278 posts, RR: 8
Reply 8, posted (7 years 1 month ago) and read 19476 times:
It would be feasible to produce an engine to power a twin of this size, but the fan diameter would preclude putting it under the wing of a 747. It has been done on tests but the ground clearance was very small and not practical for 'normal' operations.
Futhermore, the wing structure would have to be substantially modified as the current wing relies upon the thrust load and bending relief from the engines where they are currently placed.
Additionally, the current hydraulic, electric and air systems would have to undergo considerable modification to suit a twin configuration.
All of this adds up to considerable cost. If Boeing thought it would be worthwhile then they would have done it already!
Tell you what, why not just buy a 777-300ER instead?!
AcNDTTech From United States of America, joined Jul 2008, 338 posts, RR: 0
Reply 13, posted (7 years 4 weeks 1 day 14 hours ago) and read 18198 times:
In time it will happen.....no doubt. Engine technology is growing at a phenomenal rate. I can't wait to see what the next 10-15 years brings. I also think there will be another supersonic passenger aircraft in that time frame. Aviation Week & Space Technology has some pretty good info. about the giant leaps that have/are being made pertaining to SST technology.
EA772LR From United States of America, joined Mar 2007, 2838 posts, RR: 10
Reply 14, posted (7 years 4 weeks 1 day 14 hours ago) and read 17804 times:
Quoting DL767captain (Reply 3): I don't think the current 777 engines are enough to power a 747 sized jet on two engines. Maybe something like the engines going on the A350 could work... or maybe the A380... but if they could get enough thrust out of one engine to allow it to be ETOPS certified much like the 777 then it could happen.
The 777-300ER's GE90-115B has 115,300lbs of thrust and demonstrated127,900lbs of thrust...much much more than the TrentXWB will produce and even more than the Trent900/GP7200 can produce. So if there was any engine able to power a 747 as a tin, it would be a derivative of the GE90-115B
Quoting Keesje (Reply 11): Yes KLM tried it last winter but returned to squads because of ground clearance concerns.
That is really awkward seeing a 747 with 2 engines...
We often judge others by their actions, but ourselves by our intentions.
Starlionblue From Greenland, joined Feb 2004, 17365 posts, RR: 66
Reply 22, posted (7 years 4 weeks 1 day 2 hours ago) and read 12270 times:
Quoting DL767captain (Reply 3): I don't think the current 777 engines are enough to power a 747 sized jet on two engines. Maybe something like the engines going on the A350 could work... or maybe the A380
Well yes. That would be the idea. However you would be developing the most expensive engines ever for a rather small market (at least to start with). Not saying it won't happen, just that there are a few economic hurdles.
Quoting United Airline (Reply 10): A twin engined B 747 makes sense. It's bigger than the B 777-300ER and it saves fuel
Just because it has two engines doesn't necessarily mean it saves fuel.
"There are no stupid questions, but there are a lot of inquisitive idiots."
SEPilot From United States of America, joined Dec 2006, 7383 posts, RR: 51
Reply 23, posted (7 years 3 weeks 6 days 10 hours ago) and read 12013 times:
This is never going to happen. The market for VLA's is not big enough to justify it, and the cost of developing the engine would be prohibitive. Eventually an engine big enough for the job will be developed, but it will go on Y3 or its successor. The 747 would require too much redesign to accommodate engines that large.
The problem with making things foolproof is that fools are so doggone ingenious...Dan Keebler
I have to quote myself on this one. I didn't mean that we will see a twin engine 747. What I meant to say was that I believe that we will see a twin engine plane with the equivalent cargo and/or pax capacity as the current 747(400).
: IIRC the 747-400(ferry weight) can fly on 2 engines thought out the entire flight regime. So yeah its possible maybe [Edited 2008-08-06 22:54:55]
: This I totally agree with. I have no doubt that eventually we'll see twins even bigger than the A380. They may be BWB's, but they will come. I do not