Leeham News and Analysis
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Leeham News and Analysis
- Pontifications: Technical challenges for UAMs, et al, only part of the problems March 28, 2023
- An uneven financial recovery among OEMs and Suppliers March 27, 2023
- Bjorn’s Corner: New aircraft technologies. Part 5. Optimal fuselage March 24, 2023
- Bjorn’s Corner: New aircraft technologies. Part 5P. Optimal fuselage March 24, 2023
- A Chinese intervention in Ukraine would kill its aerospace industry March 23, 2023
How Airbus can kill the Boeing 797
Artisit concept of the Boeing 797. Rendering via Google images.
May 10, 2017, © Leeham Co.: Airbus can kill the business case for the prospective Boeing 797, the New Midrange Aircraft also known as the Middle of the Market Airplane,
- Reuter’s Tim Hepher has this story.
- CNN’s Jon Ostrower has this story.
All it has to do is move first, instead of waiting for Boeing to launch the 797, something considered likely next year.
If Airbus launched what is commonly called the A322, a larger, longer-range version of the A321neo, the new version would become a true replacement for the Boeing 757, meet economics of the smaller 797, which has a working title of the 797-6, at a much lower capital cost.
Could an NMA be made good enough? Part 6
By Bjorn Fehrm
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Introduction
April 27, 2017, © Leeham Co.: We have in several articles gone through the sizing of an NMA (New Midrange Aircraft). We looked at the fuselage, cabin, wings and engines. Now we will sum the exercises and look at the performance of the resulting aircraft.
Boeing is seriously considering launching an NMA. The key to the launch decision will be the airplane’s economics: for development and production as well as operation.
The idea is the NMA shall have “twin aisle comfort with single aisle economics.” We will now use or performance model to analyze if the final aircraft has these characteristics.
Summary:
- An NMA designed to the principles in our articles will have a seven abreast dual aisle cabin. The cabin will increase passenger comfort in the 200 to 260 seat range and speed ground operations.
- Careful design of the fuselage, paired with a modern wing and engines, would produce an NMA with “dual aisle comfort and single aisle economics.”
Could an NMA be made good enough? Part 5
By Bjorn Fehrm
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Introduction
April 20, 2017, © Leeham Co.: After defining the fuselage and wings, it’s now time for the engines. We go through the sizing criteria for engines for airliners and find the size of engine that is needed for the NMA.
The NMA will need engines which are larger than the single aisle engines for Airbus’ A320neo and Boeing’s 737 MAX. But they will be smaller than the next size up for modern engines, the GEnx-2B for Boeing’s 747-8.
Figure 1. The NMA takes more and more the shape of a 767 replacement (A United 767-200). Source: United
This means the NMA will need new engines, at least 50% larger than the present engines designed for A320neo and 737 MAX.
Summary:
- An NMA engine will be sized by V2 safety speed or Maximum Continuous Thrust (MCT) criteria.
- The normal Top of Climb (ToC) sizing point will be less stressing for a twin engine airliner like NMA.
Could an NMA be made good enough, Part 4?
By Bjorn Fehrm
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Introduction
April 13, 2017, © Leeham Co.: Last week we finished the sizing of the fuselage for an NMA design. Now we continue with the wing. We go through the key parameters that will decide the performance of the wing and the aircraft.
The NMA is a critical design case. The performance envelope has to be just right. Too high and the economics of the aircraft won’t work, both for purchase price and operational costs.
Figure 1. The NMA takes more and more the shape of a 767 replacement (A United 767-200). Source: United
Summary:
- Wing design is the mixing of conflicting requirements to a successful compromise.
- The NMA wing will use the design principles of the Boeing 787/777X wings but will be different in area, size and plan-form.
- The wing is sizing the engines, something we will look at in the next article.
Could an NMA be made good enough, Part 3?
By Bjorn Fehrm
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Introduction
April 6, 2017, © Leeham Co.: After sizing the cabin of the NMA, the time has now come to size the fuselage. Can a fuselage be designed that gives an NMA “dual aisle comfort with single aisle economics”?
Figure 1. The NMA takes more and more the shape of a 767 replacement (A United 767-200). Source: United
We will investigate the dimensions, the drag and the weight of an NMA fuselage. It will be based on the cabin and design techniques we described in Part 2. We then compare the efficiency of the result with the fuselages of the Airbus A321LR and Boeing 767. This will show if the necessary efficiency can be achieved.
Summary:
- It’s possible to design a dual aisle fuselage with the same perimeter per seat abreast as a single aisle fuselage.
- This will make the central, cylindrical, section have competitive weight and drag characteristics.
- The larger diameter of the dual aisle fuselage will increase the size of the tapered front and rear sections however.
- It’s still possible for an NMA fuselage to be as weight-efficient as a single aisle fuselage, measured per transported passenger.
Could an NMA be made good enough, Part 2?
By Bjorn Fehrm
Subscription Required
Introduction
April 3, 2017, © Leeham Co.: In the first part of our investigation on how good an NMA can be, we explored low weight and drag fuselage design. We will now continue with the design consequences for the fuselage construction and the cabin.
What drives whether one goes for an Aluminum or CFRP (Carbon Fiber Reinforced Polymer) fuselage?
Figure 1. The NMA takes more and more the shape of a 767 replacement (A United 767-200 pictured). Source: United.
What will be the typical dimensions for an NMA fuselage and what will be passenger capacities?
Summary:
- An elliptical fuselage will force a CFRP design.
- The fuselage door configuration will be critical for cabin capacity and flexibility.
Naming games
March 31, 2017 (c) Leeham Co.: With the likelihood appearing greater and great Boeing will launch a new, middle of the market sector airplane, what’s the name
Is “A360” a name for the next Airbus aircraft? Or would it be the butt of jokes? Rendering via Google images.
going to be?
Steven Udvar-Hazy, chairman of Air Lease Corp, already calls it the 797. We agree, though until this is a done deal, we’re calling it the 7M7 while in development.
If Airbus responds with a stretched A321neo–anything but a certain prospect–the working title among the press has long been A322. Airbus officials have occasionally called it the A321 Plus-Plus, a name that will hardly roll off the tongue.
If Airbus were to respond with a new twin-aisle, either smaller than the A330-200/800 (which aren’t selling these days) or about the same size, what would this be called? Skipping to A400 doesn’t work: the name is taken by the A400M, which in any event is a snake-bitten name.
Then, what will the replacements for the Boeing 737 and Airbus A320 be called.
It’s already assumed “797” is the name of the widely expected Boeing middle of the market airplane. Rendering via Google images.
For Boeing, the “797” runs out the string of 7 Series choices. For Airbus, folklore says it rejected the name “A360” because of the jokes that would be made about the airplane flying in circles if an issue required a return from its takeoff point. According to the same folklore, “A370” was rejected because the “7” harks to Boeing’s 7 Series.
So: just for fun, let’s have some naming contests.
Is there an NMA gap?
By Bjorn Fehrm
March 21, 2017, ©. Leeham Co: The NMA (New Mid-range Aircraft), or, as it’s called more and more, the Boeing 797, is hot. The potential buyers at the recent ISTAT meeting in San Diego urged Boeing to take the decision and get it done.
At the same meeting Airbus responds, “Any NMA gap is covered. Our A321neo and A330-800 is available and and no new aircraft is needed.”
Time to look at who’s right. Is there an NMA gap or not? Is there a difference in how Airbus’ and Boeing’s product lineups cover the market? Read more
7M7 is key to Boeing’s future
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Introduction
An enthusiast’s concept of the Boeing 797. Image via Google.
April 24, 2017, © Leeham Co.: Boeing faces growing challenges this year as airplane sales slow, production of the 777 Classic declines, its new Global Services unit prepares to formally launch and a decision whether to authorize a sales offering for the New Midrange Airplane looms.
We’ve spent a lot of time covering slowing sales and declining 777 production. Tomorrow, we’ll have a special report on the ambitious Global Services strategy.
We’ve also spent a lot of time on the Boeing NMA. LNC’s Bjorn Fehrm last week presented number three in a paywall series on the NMA, looking at it from a technical viewpoint. We’ll take a look at it from a strategic point of view today.
Summary
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6 Comments
Posted on April 24, 2017 by Scott Hamilton
Airbus, Airlines, Boeing, Leeham News and Comment, Middle of the Market, MOM, Premium
737-10, 737-9, 747-8, 787, 787-8, 787-9, 7M7, A321LR, A321NEO, A330-200, A330-800, A380, A400M, Airbus, Boeing