Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- The Boeing 767 Cross Section, Part 1 November 24, 2022
- Movie Review: Devotion November 21, 2022
- China will accelerate development of its commercial aerospace sector November 21, 2022
- Bjorn’s Corner: Sustainable Air Transport. Part 46. eVTOL comparison with helicopter November 18, 2022
- The economics of a 787-9 and A330-900 at eight or nine abreast November 16, 2022
GE engines faces challenge from PW, RR GTF technology
The recent announcement by Rolls-Royce that their future engines will contain gearboxes has put GE and its CFM partner SAFRAN under considerable pressure.
GE/SAFRAN were together with Rolls-Royce proponents to go directly from Direct-Drive turbofans to Open Rotor designs for the next generation aircrafts. This left Pratt & Whitney as the only major engine manufacturer promoting high by-pass ratio geared turbofans as a better alternative for these aircrafts. With the Rolls-Royce announcement of Advance for 2020 (Carbon fanned tri-shaft) and Ultrafan (Geared big fan) for 2025, this has all changed. Suddenly Pratt & Whitney has strong support in their strategy and GE/SAFRAN stand out as loners.
By honing key technologies in their traditional two shaft turbofans GE, and GE/SAFRAN in CFM, have built a market leading position in all thrust classes, Regional (CF34), Single Aisle (CFM56) and Dual Aisle (CF6, GEnx, GE90). Their declared next step was Open Rotor for future Single Aisle while keeping Direct-Drive for larger engines.
Airbus and Snecma continue to research open rotor technology. Aviation Week has this story.
Now this solid position is threatened. The geared architecture has won the future regional market (CSeries, MRJ, E-Jet E2 goes PW GTF), market parity on the A320neo family and the 757 replacement studies by Boeing (dubbed NAS, New Airplane Study) will not go Open Rotor as Open Rotor only works up to M 0.75 and the 757 replacement will likely fly over 4,000nm, necessitating higher cruise speed. The NAS will thereby favor a geared turbofan instead of Open Rotor. Why not Direct-Drive? There are two major reasons:
- A geared design allows higher by-pass ratios and thereby higher propulsive efficiency without the engine being too heavy from its large low pressure turbine needed to drive a high BPR fan.
- A geared design can allow the big fan to rotate slowly and with a low pressure ratio. This creates a low noise engine, a very important feature for aircrafts operating out of noise troubled airports.
GE/SAFRAN has shown with their CFM LEAP project that they can match the efficiency levels of a geared engine like Pratt & Whitney’s GTF, using its superior hot section technology to achieve the high efficiency. It cannot achieve the low noise levels of a geared fan however; engine noise stands in direct relation to fan rotational speed and pressure ratio.
It will thereby be the environmental factors that will put the most stress on GE/SAFRAN’s present strategy. Having lost the regionals to the geared camp, will it also lose the next generation short/medium haul? It will be interesting to watch the GE/SAFRAN over the next 18 months: does it change strategy or not? If one goes by the recent words of GE Aviation President David Joyce (who spoke at last week’s opening of their Indiana LEAP factory), he thinks his present line-up is fine for a 757 replacement, and he sees no urgent need for new developments.
By Leeham Co EU
Rolls-Royce plans for new single-aisle, twin-aisle airplane engines
Rolls-Royce may not be at a cross road but it’s certainly at a fork in the road.
RR sought to be a dual-source supplier for the Boeing 777X, competing with GE Aviation for the privilege; it was generally a given that GE would be a provider. The question was whether it would be the sole supplier or share the platform with another. Pratt & Whitney withdrew, concluding the business case wasn’t there for its proposed big Geared Turbo Fan. RR stayed in the competition, assured by Boeing that it wasn’t a stalking horse to GE.
But GE won the position as exclusive supplier, much to RR’s consternation.
Next, the future of the Airbus A350-800, powered exclusively by RR, is in serious doubt. The backlog is now down to a mere 46 as customer after customer, encouraged by Airbus, up-gauged to the A350-900 and -1000 sub-types. While RR is also the exclusive supplier on each of these models, and the engines are largely common, there has been substantial investment by Rolls on the -800’s application. If the -800 is canceled (as many industry observers believe it will be), RR’s investment is largely down the drain. How does Airbus “make good” to RR for this?
Odds and Ends: Airbus neos; 757RS/A320RS; charity efforts
Airbus neos: The conversation continues, with Tom Williams, EVP of programmes, giving an interview to Flight Global about the A330neo and the A380neo. Plane Talking has another version of the Williams interview. Notable in Plane Talking’s report is the indication Williams said it will be a year before a decision is made on the A330neo. Our information is that a decision, whether yes or no, is due this year. PT also reports Williams indicated an A380neo would be a 2020s product. This suggests the prospect of a new engine from Rolls-Royce, which is under development, or conceivably a Big Engine Pratt & Whitney GTF could be considered.
757RS/A320RS: Aerotubropower, whose expertise is engines, discusses the implications of the planned improvements in fuel burn on the Pratt & Whitney Geared Turbo Fan and what this means for the replacement of the Boeing 757, 737 and Airbus A320 families.
Charity efforts: IAM 751, the touch-labor union for Boeing, is often portrayed as a bunch greedy members who feel a sense of entitlement. One can certainly debate this point, but what isn’t debatable is 751’s efforts at charity throughout the year. Every once in a while, we pop over to 751’s blog. Today (Feb. 19) the first four items are about philanthropic efforts in Pierce and King counties.
Just as 751 members are often cast as greedy, so is Boeing, so it is only proper in this context to point out that Boeing also engages in philanthropic endeavors throughout the US (we don’t know about abroad). Here’s a link to some of Boeing’s efforts.
Airbus, engine OEMs make the case for A340 future
Airbus held a summit December 4 for stakeholders in the A340 to explain how there continues to be life after production ended and despite being a four-engined airplane in a two-engine world.
Key to the future of this out-of-production airliner is increasing the capacity of the A340-600 to an exit-limited 475 seats and for Rolls-Royce to alter its Total Care engine maintenance Power-by-the-Hour terms and conditions to reduce costs.
Airlines, financiers, appraisers and the engine makers were invited by John Leahy, chief operating officer-Customers of Airbus. Engine providers CFM International, Rolls-Royce, Lufthansa Airlines and Hi Fly, a small European airline, made presentations in addition to Airbus.
Airbus produced 246 A340-200/300s and 131 A340-500/600s; 227 and 131 respectively are in operation or parked.
|
Status |
A340-200 |
A340-300 |
A340-500 |
A340-600 |
|
In Service |
19 |
175 |
20 |
90 |
|
Stored |
6 |
27 |
14 |
7 |
Airbus guaranteed the residual value on an unknown number, and has strong motivation to see these airplanes continue in service, according to one person familiar with the situation.
CFM LEAP accelerating in test program; Airbus and the A350-800
Aviation Week has a long, detailed story about the test program for the CFM LEAP engine, which is accelerating rapidly.
In its 737 MAX program update yesterday, Boeing said the LEAP-1B has begun testing and it will benefit from the testing already underway for the LEAP-1A, the version that is designed for the Airbus A320neo family. The LEAP-1C for the COMAC C919 is on its original schedule for certification in 2015, despite the fact the C919 has slipped to at least 2017, reports AvWeek.
The 737 MAX is exclusively powered by the LEAP, as is the C919. The former has more than 1,600 firm orders and the latter just hit its 400th order/commitment. CFM faces competition on the A320neo family from Pratt & Whitney’s P1000G Geared Turbo Fan, where PW holds a 49% market share against CFM, which previously held a larger, more dominate position in the A320ceo competition. A large number of orders don’t yet have an engine selection.
PW is the sole-source engine provider for the Bombardier CSeries, the Mitsubishi MRJ and the Embraer E-Jet E2. PW splits the engine choice on the Irkut MC-21 (soon to be renamed the YAK 242) with a Russian engine.
Just as Boeing’s LEAP-1B will benefit from the experience of the LEAP-1A now in testing for Airbus, Airbus will benefit from the testing and experience of PW’s testing of the GTF on the Bombardier CSeries.
Aviation Week also has a story about the Airbus A350-800 with the blunt headline, The airplane Airbus doesn’t want to build. This refers to the A350-800. AvWeek muses that the outcome of the merger between US Airways, now the largest customer for the airplane, and American Airlines, may be the deciding factor for the airplane. We agree. With American’s large order for the Boeing 787-9, the A350-800 would be unnecessary.
That would then leave Hawaiian Airlines as a key decision-maker. We hear in the market that Hawaiian is just sitting back and waiting to see what kind of incentives Airbus will offer to entice a switch to the larger A350-900.
C919 program in trouble
COMAC’s bid to develop a 150-200 passenger jet is in trouble.
According to this report, CFM doesn’t plan to proceed with an assembly line within China for the LEAP-1C that will power the C919. Concerns over intellectual property and the business case for the airplane are cited.
According to this article, GKN of Europe, which was to build the horizontal tail assembly, isn’t going to.
The airplane was supposed to enter service in 2016 and we already figured a delay of at least two years. Given the regional ARJ21 is already around seven years late, and still not certified, we think the two years is probably going to move to the right substantially.
If we’re generous and look at a 2020 EIS, this means the C919–an Airbus A320 look-alike–would enter service five years after the A320neo and three years after the Boeing 737 MAX. The airplane is also going to trail in sophistication.
Boeing officials as recently as this year still believe China will develop viable, commercially competitive airliners within the next 25-50 years. The ARJ21 program has been a disaster and it we anticipated that the C919 would be better than the ARJ21 (a low bar, to be sure), not truly competitive with the A320 and 737 but COMAC’s “makee-learn” airliner. It’s looking like this will be a disastrous program, too.