Chinese Aviation Industry

delft

Brigadier
It still will not compensate the larger drag generated from a larger wing surface since all air liners are streamlined for optimal drag coefficient. Try again.
It may sound strange to you but matters are very much more complicated. Look at the, admittedly an old aircraft, but one that was made under licence in a country that at that time already believed deeply in small wing surfaces: the English Electric Canberra, built by Martin as the B-57.
 

delft

Brigadier
No they are not blended since you can define the fuselage from the wings in that picture.
Basically a HWB transport's overall length and width will be shorter than a conventional plane with the same capacity that can be separated into a fuselage and wings since passengers will be seated within parts of the wing while the main body will generate lift as well reducing the over all length in both dimensions.
I saw a similar concept by NASA on AW&ST and it was meant for use as a cargo plane: no windows for passengers, no trouble with escape facilities for hundreds of passengers.
 

Quickie

Colonel
I saw a similar concept by NASA on AW&ST and it was meant for use as a cargo plane: no windows for passengers, no trouble with escape facilities for hundreds of passengers.

At first his argument was a larger wing is always more draggier, and now suddenly he is okay with the flying wing design which is basically an even larger wing and therefore even draggier and less efficient?

The hybrid wing-body (HWB) transport is not a new idea, various manufacturers and research institutes around the world has shown interest in the concept. Some small scale demonstrators has already been built and larger ones are being planned. The most famous project is probably the Boeing X-48 series.

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This design still has a long way to go before entering commercial service, mainly because of challenges in flight control. There are also issues to solve in cabin arrangement. Less windows may be offset by improved in-flight entertainment but emergency exit design requires more careful considerations.

It is only normal for any country with an ambition in future airliner/transport design to venture into HWB studies, because such a design offers greatly improved fuel economy (rather than increasing drag and reducing efficiency). Boeing, NASA, Lockheed Martin Skunk works, and now AVIC all seem to agree. But I guess you're right, these institutions know nothing about aircraft design when compared to SamuraiBlue.

The concept is a step back away from the full fledged flying wing design and closer back to the conventional layout of an jet airliner and is, in my opinion, meant to bypass the problem of flight control and stability problem of the former.

Obviously the spaces within the larger wings would be fully utilised for payload in terms of fuel, cargo and even passengers in the more spacious sections where the large wing blend with the main body.
 

superdog

Junior Member
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That is not a Hybrid Wing Body Transport.
The ones NASA and Boeing was studying was more like a flying wing where passengers would be seated in parts of the wing as well.The one above is just a passenger liner with large wings that is not blended into the the fuselage.
Do you realize that HWB and flying wings are two different things? Both Boeing and NASA called the X-48 a HWB, not a flying wing.

The pictured model is not a X-48 or Boeing BWB copy, the config is different and the intended size is much smaller at regional jet level, but it is a HWB nonetheless. HWB (sometimes also called BWB, Blended Wing Body) is not defined by "passengers would be seated in parts of the wing as well", that's a definition you invented. We have examples like LockMa's RCEE, where only the forebody is of blending design and the aft is conventional, and we have this one where the blending happens at the mid-aft sections with a conventional nose. In both examples only a cylindrical central cabin is pressurized by design. It may be widened into an ellipsoid at the blended section, but nothing like the Boeing BWB or the C-Wing.

HWB is defined by its name, that the wings are significantly blended with the fuselage, which is exactly what this model shows. You may want to check your eyes if you don't see the blending, considering that you're quoting a picture of their newest iteration, not their earliest small model (their earliest model only implemented the 2D wing shape and didn't implement the blending surfaces).

Besides, no need argue the obvious when the designer (engineer at COMAC) clearly stated that this model is used to study the aerodynamic properties of HWB. Use google translate if necessary:
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灵雀验证机是一款用于验证翼身融合气动布局客机低速气动特性、操纵性和稳定性的缩比验证机。它的原型是中国商飞公司新一代支线飞机的非常规气动布局的方案,该验证机旨在探索气动布局、飞控等领域的新技术,同时承担着建立一套完整的技术验证机研发流程和技术管理体系的任务。
If you think that COMAC designers have no idea what HWB is, or that they are prototyping their future regional jet with shitty fuel efficiency because they don't know basic aerodynamic rules like wetted area leads to drag......well you can keep believing.
 

Hendrik_2000

Lieutenant General
Now that it is officially delivered to flight test group , first flight is imminent

C919 aircraft first aircraft delivery test center
2016-12-30 10:07 China Commercial Aircraft Company News
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Core Tip: chairman of the China Commercial Aircraft Company, party secretary, C919 project director Jin Zhuang Long attended the delivery ceremony to each team battle flag, general manager, C919 project deputy commander He Dongfeng pep talks, chief accountant Tian Min, vice General manager, C919 large passenger aircraft chief designer Wu Guanghui, deputy general manager Liu Linzong attended the event.

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Activity site

December 25, 2016, China Commercial Aircraft Company C919 aircraft first aircraft delivery test center. General Manager, C919 Project Deputy Director-General He Dongfeng as the mobilization speaker, Chief Accountant Tian Min, Deputy General Manager, Deputy General Manager of C919 Project, C919 large passenger aircraft chief designer Wu Guanghui, deputy general manager Liu Linzong attended the event.

He Dongfeng in his speech to encourage all participants C919 project participants continue to go all out to full of enthusiasm and enthusiasm into the follow-up to production, scientific research and test flight of the work. He stressed that in the follow-up work, to win the confidence, tenacious style, the implementation of responsibility, a clear mandate, the courage to communicate, good communication, strengthen coordination, cohesion. Always put the safety and quality of work in the first place, to ensure foolproof.

Wu Guanghui on the next step work requirements. The flight company and the flight test center were responsible for reporting the status of the transfer of aircraft and aircraft to receive inspection. Assistant General Manager of the company, General Manager Shen Weiguo on the flight and the company's chief flight attendant, flight test center director Qian Jin signed the aircraft handover. The team responsible for the statement were made.

Relevant departments of the company headquarters and the units, the relevant units responsible for the test, C919 project team 0, the test team related personnel to participate in activities.

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taxiya

Brigadier
Registered Member
Just a brainstorm,

If the COMAC blend-wing concept photo was photo-shopped to Mitsubishi color scheme (MRJ) and claimed to be from Japan, would SB still be arguing against it? Maybe we will be hearing him praising the design as ingenious.:rolleyes:
 
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