Xtra1 From United Kingdom, joined Jul 2005, 111 posts, RR: 2 Posted (8 years 2 weeks 4 days 4 hours ago) and read 14033 times:
Easyjet have been all over the news today and I see that they are jumping on the 'environmentally friendly' band-wagon.
They said that they plan to introduce a new "Ecojet" by 2015.
Here's a pic:-
Strange looking plane. The front looks suspiciously like the 787!
Going beyond the PR hype, it's interesting because it spells out exactly what easyJet are looking for in a new narrowbody aircraft. Some interesting notes in the press release about configuration, cruise speed, range, etc.
I wonder if there's anything to be read in the timing of this announcement?
[Edited 2007-06-14 13:56:12]
Goodbye SR-LX MD-11 / 6th of March 1991 to the 31st of October 2004
Beaucaire From Syria, joined Sep 2003, 5252 posts, RR: 24
Reply 5, posted (8 years 2 weeks 4 days 3 hours ago) and read 13872 times:
Looks like a real beauty to me - I wonder who will come up with the technology to make an unducted fan without housing that fulfills noise requirements.
But the designers wet-dreams are not neccessarily full-filled byt the guys who have to build the airframe and fans.
Nevertheless- a great initiative and a kick into the traditional aircraft designe mood.But someone must have designed the model-so would be interesting to know who that did?
Parapente From United Kingdom, joined Mar 2006, 1881 posts, RR: 10
Reply 7, posted (8 years 2 weeks 4 days 3 hours ago) and read 13767 times:
"Shame they don't plan to drop the orange in 2015". Thats it!- Thats all we think of the first public attempt by an airline to really try to address the key issues of today and tomorrow. Oh I suppose the windows were a funny shape as well
Justloveplanes From United States of America, joined Jul 2004, 1110 posts, RR: 1
Reply 8, posted (8 years 2 weeks 4 days 3 hours ago) and read 13722 times:
It looks like one of the Boeing concept studies that has been floating around. That article that resurfaces every year with picutures of designs of the future and includes prop fans, BWB's and one other concept which doesn't come to mind now.
Beaucaire From Syria, joined Sep 2003, 5252 posts, RR: 24
Reply 9, posted (8 years 2 weeks 4 days 3 hours ago) and read 13695 times:
Quoting Justloveplanes (Reply 8): That article that resurfaces every year with picutures of designs of the future and includes prop fans, BWB's and one other concept which doesn't come to mind now.
I have the impression Easyjet this time do a little more than just a PR event.The company is acting slightly different than Ryanair or the other Low-Cost's and their statements regarding environment seem genuine.If they can push manufacturers to speed up their design-projetcs and actually switch from conceptual state into prototype analysis,it would be a tremendous tep forward.
Main task with though be with the engine-manufacturers to demonstarte a gear-boxed unducted fan.
-The design range of the easyJet ecoJet should be 2,000 nm or less
-The airframe will be made of advanced weight-reducing materials similar to those used in current projects like the Boeing 787
-The projection for the eco-liner would generate less than 47g of CO2 per passenger km. For comparison, easyJet’s current operations generate 97.5g of CO2 per passenger km, the Toyota Prius emits 104g of CO2 per kilometre
-The easyJet ecoJet will form a family of aircraft from 150-250 seats in single class configuration (130-220 seats in 2-class)
-The easyJet ecoJet will remain in production beyond 2040 the industrial requirement will be to produce more than 60 aircraft a month
-One would expect the wing to be manufactured out of carbon fibre.
-The requirements of a laminar flow wing will dictate a slightly slower design cruise speed – Mach 0.75 compared to Mach 0.78/0.79 for today’s conventional designs.
-easyJet is working closely with all the relevant airframe and engine manufacturers on the next generation of short-haul aircraft
VirginFlyer From New Zealand, joined Sep 2000, 4579 posts, RR: 39
Reply 19, posted (8 years 2 weeks 4 days 1 hour ago) and read 13180 times:
This is quite an interesting concept - between this and the rumblings coming out of the engine manufacturers, it seems as though the prop-fan is coming back into vogue (and who knows, maybe triangular windows too - Caravelle lovers rejoice!). There are a couple of articles which provide some interesting pictures:
There are a couple of issues with this design concept (not necessarily problems, just issues which will need to be considered) which I'd like to point out.
1) By locating the engines off the wing, you lose the bending moment relief the weight of the engines provides, and thus the wing needs to be stronger, and thus heavier. (For those unfamiliar with the concept, basically the wing will try to bend upwards in flight, due to the lift being generated along its length, and the majority of the aircraft's weight being concentrated at the root. By applying some weight at a position along the span of the wing, the amount of upwards bending moment at the wing root is reduced, and thus the wing doesn't have to be designed to be as strong.)
2) The location of the engines on this concept doesn't seem to lend itself to easy access for service.
3) A fair bit of testing would need to be conducted into the effect of a blade being spat - from the look of the design, it seems as though it would very likely take out a significant amount of the tail control surfaces, or even the entire stabiliser.
An alternative design placing the engines over the top of the wing would address the first problem, and possibly the second, although the third seems like it will be an issue regardless of the placement of the engine.
In order to prevent excessive cabin noise, an over-the-wing installation of the engines might well require a high wing, which in itself is not desirable, as it puts structural elements through the passenger cabin rather than the cargo hold. Engines mounted above a high mounted wing would also be harder to access than those above a low mounted wing.
Like most designs, there will be trade-offs and compromises. It could well be that the cost savings realised from the fuel consumption outweigh the costs of having heavier wings with harder to access engines. It will be very interesting to see if an airframer can make a concept such as this work...
As an afterthought, I wonder how easy it would be to design the aircraft such that it could be fitted either with open rotor prop-fans or traditional closed rotor engines. If it could be done, it would yield a rather versatile family of aircraft in the 70-240 seat category which offered open rotor engines and a low MTOW for short range efficiency, or closed rotor engines and higher MTOW for longer range missions. Boeing has been studying the idea of a modular family for the Y1/737RS with different fuselages widths and wings - I wonder whether such a modular concept could be reasonably extended to different powerplant types.
With Paris less than a week away, and the world's attention firmly on environmental issues, I wonder how many other environmentally driven concepts are going to see the light of day in the near future...
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh
Richardw From United Kingdom, joined May 2001, 3781 posts, RR: 0
Reply 20, posted (8 years 2 weeks 4 days 1 hour ago) and read 13134 times:
Quoting Parapente (Reply 7): "Shame they don't plan to drop the orange in 2015". Thats it!- Thats all we think of the first public attempt by an airline to really try to address the key issues of today and tomorrow. Oh I suppose the windows were a funny shape as well
Was just a view about the livery.
You haven't said anything about the airliner, this is airliners.net and not mud-slinging.com BTW.
NDSchu777 From United States of America, joined Oct 2001, 419 posts, RR: 3
Reply 24, posted (8 years 2 weeks 3 days 21 hours ago) and read 12674 times:
Definitely an interesting concept. It will be interesting to see if Boeing and Airbus are going to incorporate a more radical design like this into the next generation of narrowbody aircraft.
Definitely a smart move on easyJet's part, especially since the heart of the "aviation is single-handedly destroying the environment" seems to be centered in the UK. The industry needs to tout advances in technology like this now before we're labled as public enemy #1 and we're just taxed out of business.
: Why not Embraer ??? If Airbus forges some kind of lose alliance with the Brazilians,as suggested, to jointly develop a new un-ducted fan aircraft? Ag