COMAC C919

sunnymaxi

sunnymaxi

Major
Registered Member
Tomboy said:
I remember seeing @sunnymaxi say that the CJ-1000A is rumored to be slightly worse in fuel burn than even the LEAP-1C which some say is a LEAP series engine in name only while still using older tech.
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that's not my statement bro.. i never said this.

there is no authentic information regarding CJ-1000A performance like fuel consumption and noise level. AECC never disclose.

AECC did some minor changes in CJ-1000A and bypass ratio has increased.. Heavy use of composite materials and 3D printed process in different Engine composite/parts. the combustion chamber adopts an annular chamber design and equipped with additively manufactured lean premixed fuel nozzle to reduce pollutant emissions.
 
Tomboy

Tomboy

Junior Member
Registered Member
sunnymaxi said:
that's not my statement bro.. i never said this.

there is no authentic information regarding CJ-1000A performance like fuel consumption and noise level. AECC never disclose.

AECC did some minor changes in CJ-1000A and bypass ratio has increased.. Heavy use of composite materials and 3D printed process in different Engine composite/parts. the combustion chamber adopts an annular chamber design and equipped with additively manufactured lean premixed fuel nozzle to reduce pollutant emissions.
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Ah sorry, I misinterpreted your post in Chinese engine dev thread. I'm not sure if this is considered credible or not but the guy you were quoting in that post on the thread said:
Red tsunami said:
A guest who visited AECC CAE and had close contact with CJ-1000 and CJ-2000 participated in the latest chahuahui. According to him

1. The difference between CJ-1000AX and CJ-1000A:
From the appearance, AX is slightly larger than A. The AX is more like a validation engine for accumulating experience and cultivating a team, while the A, which is undergoing flight tests on Y-20, is the true prototype.

2. The nacelle of CJ-1000 was developed by AECC CAE.

3. It is expected that the test flight of CJ-1000 version C919 will begin in 2027 or 2028.

4. The reasonable time to obtain CJ-1000 airworthiness certificate is around 2030.

5. Compared to CJ-1000, CJ-2000 has a relatively faster progress. The overall progress of CJ-2000 is 3 to 4 years slower than CJ-1000.

6. The CJ-2000 is currently in the stage of validation machine(CJ-2000AX), and CJ-2000A has basically taken shape. The first prototype (CJ-2000A) will be launched this year.

7. The casings and fan blades of CJ-1000 and CJ-2000 both use a large amount of composite materials.

8. AECC CAE showed the visitors the composite material fan blades and described them as "resin soaked and pressed as a whole". The fan blades have a texture similar to beeswax. The leading edge of the blade is wrapped with metal. It should be titanium alloy. Composite material fan blades belong to the second generation, and AECC CAE also showed the first generation of titanium alloy hollow blades. They stated that this blade is slightly heavier than composite material blade.

9. The exhibition board of AECC CAE shows that compared to LEAP-1C, CJ-1000A has slightly higher fuel consumption but lower noise.

10. Due to its latecomer advantage, some of the experimental facilities and conditions of AECC CAE are very advanced. AECC CAE is currently in the construction stage and attaches great importance to the construction of laboratories and other related facilities. It has multiple engine test rooms, the largest of which is 14×14m.

11. C919 has a CXF version, which is 100% domestic version, and the implementation timeline is 2027. This is more like using it to achieve some kind of political deterrence.

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Source of info is only a year old, and the source is usually regarded as highly credible. Good thing is that they are indeed making a fully domestic C919 hopefully that means it'll also come with the latest innovations of the Chinese aviation industry and also that CJ-2000 also is progressing extremely fast.
 
sunnymaxi

sunnymaxi

Major
Registered Member
Tomboy said:
Ah sorry, I misinterpreted your post in Chinese engine dev thread. I'm not sure if this is considered credible or not but the guy you were quoting in that post on the thread said:

Source of info is only a year old, and the source is usually regarded as highly credible. Good thing is that they are indeed making a fully domestic C919 hopefully that means it'll also come with the latest innovations of the Chinese aviation industry and also that CJ-2000 also is progressing extremely fast.
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CJ-1000/CJ-2000 manufacturing infrastructure is mind-boggling and have pulsating final assembling lines.

CJ-2000 project is almost completed and this Engine is way way more technological advanced as compare to CJ-1000A.. the parts/components used in CJ-2000 is epitome of China's industrial prowess. fuel consumption is one of the best in the world in this category class. this engine will surprise many aviation enthusiast.
 
G

GiantPanda

Junior Member
Registered Member
Tomboy said:
Not necessary 100 percent a bad thing, extra time could allow COMAC to iron out some kinks with C919 and potentially have C919 with CJ-1000A certified at the same time.

On the note of C919, is there any plans for upgrades(ie. fully composite wing)? I do know that some people within the industry back in China doesn't seem to be very happy with how conservative the design is and to be fair I have to agree as well on paper the specs do not seem that impressive compared to competitors like A320NEO and B737MAX. I remember seeing @sunnymaxi say that the CJ-1000A is rumored to be slightly worse in fuel burn than even the LEAP-1C which some say is a LEAP series engine in name only while still using older tech. If indeed being true(Hopefully not) I don't see how a fully domestic C919 is going to be competitive internationally without some upgrades or unless the fully domestic variant is so cheap that the price tag outweighs the extra cost due to being less efficient than competitors.
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C919 specs are within that of the 737-800 and A321 which is a vast majority of the global fleet today. They are a bit behind those of the A321neo and the 737-Max (those extra miles doesn't really mean anything next to the Boeing's reputation here IMO.)

So when you take the backlog into account, it might mean you can get a COMAC (if China prioritizes foreign customers) that is as good as most of the current fleet or wait around 8-10 years for an Airbus or Boeing. COMAC isn't going to sell in the US or EU where the difference in fuel economy has a major impact. It is really about getting planes with reasonable performance in reasonable time with reasonable price for growing Global South airlines at the back of the backlog for the duopoly.
 
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