COMAC - ARJ-21 : milestone - facts and current performance

[BoQ77]

COMAC selects Victrex bracket solution for ARJ21 regional jet

Company supplies polymers, simulation analysis, tools for design optimization, and on-site processing support.

August 25, 2016
Manufacturing Group

West Conshohocken, Pennsylvania – For the development of efficient and durable aircraft floor brackets in its new regional jet ARJ21, Commercial Aircraft Corporation of China, Ltd. (COMAC) uses a combined material/service solution from Victrex. The company´s additional services, beyond supplying Victrex PAEK (polyaryletherketone, a family of high-performance thermoplastics, such as Victrex PEEK) polymers, included simulation analysis, tools for design optimization, and on-site processing support. As a result, greater design freedom, easier manufacturing, and less weight compared to traditionally used aluminum led to the replacement of the metal.

COMAC´s ARJ21 (Advanced Regional Jet for the 21st Century) is a short- to medium-range regional jet. Within the ARJ21, internal loads are supported by various systems including structural beams. Floor brackets are positioned on these beams to provide support within a gap between the loaded beams and the aircraft flooring above. Typically, these brackets would be manufactured in aluminum; the new solution promotes increased production efficiency via rapid injection molding of the part and is contributing to higher efficiency of the regional jet through weight savings and design improvements that simplify the installation process.

“Today, weight reduction resulting in increased fuel efficiency is absolutely essential and a critical success factor,” noted Dr. Bai Jie, Brackets Team Leader at COMAC. “This is common knowledge within the aerospace industry, but the full potential and processing efficiency of high-performing polymers are not. As a consequence, we have received support from Victrex as the PEEK experts with material and manufacturing knowledge. During the design process for example, their technical team delivered extensive and valuable support.”

Specifically Victrex provided, as part of its extended services, the simulation analysis, the tools for design optimization, and on-site solutions whenever processing challenges arose. In engineering terms, each of the resulting brackets:

- has a loading capacity of up to 6,000N
- has a working temperature range of -55°C to 135°C (-67°F to 275°F)
- meets the FAR 25.853 requirements for flame, smoke, and toxicity
- is lightweight (30% less compared to a corresponding aluminum bracket)
- is a viable replacement for the same part manufactured in metal

The distortion tolerance of less than 0.2mm (0.008") is considered optimal for installation in the case of the ARJ21 aircraft. Moreover, the floor brackets are extremely durable and offer an economical 30-year life-cycle, in an industry where safety and reliability are absolute prerequisites.

On the one hand, it is COMAC's goal that airlines replace smaller regional aircraft with the new jet ARJ21 to enable more passengers to fly directly between longer distance destinations within China. On the other hand, the ARJ21 could be used in place of larger aircraft in order to increase flight frequencies and improve operating efficiency in line with airlines and passengers´ needs.

Switching from metals to high-performance materials is now an established trend in the aerospace market. Victrex PEEK, a choice for the manufacture of both loaded and unloaded aircraft brackets, can be used for components that need a good balance between strength and ductility, resistance to corrosion, and a low rating for flame/smoke/toxicity, while remaining non-conductive.

Source: Victrex

 

[BoQ77]

https://defence.pk/threads/russia-c...ative-to-boeing-airbus-passenger-jets.446543/

 

[Jlaw]

Can't afford and lack of technology so give beautiful excuse like giving priority to airliner development. I can understand your excuse.

People with better knowlegeable background or training know instantly that this is flame-bait material designed by the mega trolls This is NOT the first time he has done this
wrong title, little facts, poor showing of milestone, unsound support for arj-21's performance even amateurish terminologies were used by the MT (mega troll)
Serious readers who want to seek valuable materials relevant to ARJ-21 wont come to this thread for truth
American weaponry blah blah are not in the gist of this thread so stay out of it olease

But I guess Pakistan mod let this guy get away with trolling because he brings in traffic to PDF. Am I correct? @waz

If Chinese start making false allegations against facts with proof, we would be warned and ban. But any other race get a free pass. Not sure why this is called Pakistan Defense Forum. Imo it should be called Hindustan Defence Forum.

 

[waz]

But I guess Pakistan mod let this guy get away with trolling because he brings in traffic to PDF. Am I correct? @waz

If Chinese start making false allegations against facts with proof, we would be warned and ban. But any other race get a free pass. Not sure why this is called Pakistan Defense Forum. Imo it should be called Hindustan Defence Forum.

You know what other posters say the exact same thing regarding Chinese posters i.e. that we are biased and let them get away with anything. No one warns Chinese posters like that and it is rare to see any of you banned. Ask the Vietnamese posters how lenient I have been to a Chinese poster who continues to derail a Vietnamese thread.
No one gets a free pass here, including Pakistanis, and yes they have also accused us time to time of siding with Indian posters. You can't please everyone.
I don't understand why you seem to blame me as well, considering I spend a great deal of time countering anti-Chinese trolls and idiotic posters who want to ruin your threads.
I may differ in terms on what I regard as trolling e.g. like this thread.

 

[Beast]

You know what other posters say the exact same thing regarding Chinese posters i.e. that we are biased and let them get away with anything. No one warns Chinese posters like that and it is rare to see any of you banned. Ask the Vietnamese posters how lenient I have been to a Chinese poster who continues to derail a Vietnamese thread.
No one gets a free pass here, including Pakistanis, and yes they have also accused us time to time of siding with Indian posters. You can't please everyone.
I don't understand why you seem to blame me as well, considering I spend a great deal of time countering anti-Chinese trolls and idiotic posters who want to ruin your threads.
I may differ in terms on what I regard as trolling e.g. like this thread.

Hi Waz,

You have done a great job so far. Of cos, we forumers can get a bit passionate about our stance. I apologies for my compatriot for being a little too passionate about their believe and being abit rude. I think they just getting abit frustrated. We do know what is needed to be done and what not.

 

[BoQ77]

You know what other posters say the exact same thing regarding Chinese posters i.e. that we are biased and let them get away with anything. No one warns Chinese posters like that and it is rare to see any of you banned. Ask the Vietnamese posters how lenient I have been to a Chinese poster who continues to derail a Vietnamese thread.
No one gets a free pass here, including Pakistanis, and yes they have also accused us time to time of siding with Indian posters. You can't please everyone.
I don't understand why you seem to blame me as well, considering I spend a great deal of time countering anti-Chinese trolls and idiotic posters who want to ruin your threads.
I may differ in terms on what I regard as trolling e.g. like this thread.

Thank you. As you know, Jlaw resulted others, bashing other countries a lot.
I never did that. But I was banned many times by the Chinese mod, at least recent 3 times, even I asked but no one answered me why I was banned.
I never ever believe in him.
But I believe in you for your fairness. And I believe in myself that I never intend to insult others or use dirty words.
I'm self-esteemed just like who I am in real life. I never intend to hide my real personality behind a nickname.

 

[Beast]

Thank you. As you know, Jlaw resulted others, bashing other countries a lot.
I never did that. But I was banned many times by the Chinese mod, at least recent 3 times, even I asked but no one answered me why I was banned.
I never ever believe in him.
But I believe in you for your fairness. And I believe in myself that I never intend to insult others or use dirty words.
I'm self-esteemed just like who I am in real life. I never intend to hide my real personality behind a nickname.

Yes, like demanding ARJ-21 to be a immediate success just after 2 months into service? Anything less than that is consider a failure? I can tell you no plane maker with a new type of passenger plane can achieved that feat. If that is not trolling then is what?

 

[Jlaw]

Thank you. As you know, Jlaw resulted others, bashing other countries a lot.
I never did that. But I was banned many times by the Chinese mod, at least recent 3 times, even I asked but no one answered me why I was banned.
I never ever believe in him.
But I believe in you for your fairness. And I believe in myself that I never intend to insult others or use dirty words.
I'm self-esteemed just like who I am in real life. I never intend to hide my real personality behind a nickname.

You got banned because you kept derailing Chinese threads, posting fake pictures to deceive members, using part of old maps to deceive members, and being Captain Obvious. You were warned many times by mods but continue to troll, so you were banned.

 

[BoQ77]

Yes, like demanding ARJ-21 to be a immediate success just after 2 months into service? Anything less than that is consider a failure? I can tell you no plane maker with a new type of passenger plane can achieved that feat. If that is not trolling then is what?

Everyone could make comments, me and you ...

 

[Beast]

Everyone could make comments, me and you ...

But irrational and biased comment are irreverent. Why I dont see you so interested in other plane and has the same view?

I am not to change your view but to expose your flaw and misconception trying to paint on Chinese passenger plane. So everybody including new comer who may have a fresh and clean view may see thru your agenda.

 

[BoQ77]

But irrational and biased comment are irreverent. Why I dont see you so interested in other plane and has the same view?

I am not to change your view but to expose your flaw and misconception trying to paint on Chinese passenger plane. So everybody including new comer who may have a fresh and clean view may see thru your agenda.

https://defence.pk/threads/mitsubishi-provides-update-on-its-mrj-program.444705/

 

[waz]

Hi Waz,

You have done a great job so far. Of cos, we forumers can get a bit passionate about our stance. I apologies for my compatriot for being a little too passionate about their believe and being abit rude. I think they just getting abit frustrated. We do know what is needed to be done and what not.

No problem bro, I very much appreciate your kind words and encouragement. By the way there will be some big news for this section very soon.