Chinese Engine Development

Michael90

Junior Member
Registered Member
Even a 0.1% increase in fuel requirements is bad when airlines biggest costs is in fuel. Boeing and Airbus are spending billions just to get a 1% fuel efficiency boost. And the LEAP-1C isn't exactly the best engine on the market anyway, with the C919 already lagging behind it's Boeing and Airbus counterparts in range and fuel efficiency even with the LEAP-1C. Hopefully a upgraded variant is in the works.
Yeah. This is China first commercial civilian aircraft engine. So its normal it won't match even the fairly older Western ones like LEAP-1C. However its a great start. They will need alot of time and actual production service for the engine to be tested with feedbacks and fine tuned with newer upgrades.
So all this need years if not decades.
 

BoraTas

Major
Registered Member
Footage started appearing last year of the Y-20 test platform flying with a CJ-1000 engine. I'm guessing the engines that have been delivered were only for testing. If so, then I'm not sure "production turbofans" is the correct term to describe those engines.
In the Western parlance, yes, they are production turbofans since their delivery indicates that there is a running supply chain. It may be a slow production but it is still a production.
 

3SonsAndaPhD

Banned Idiot
Registered Member
.
The US lied about its F-119 engine.

Its real thrust is only about 140KN and its thrust to weight ratio is only slightly above 7 !!

The Chinese spy ballon tested it as F-22 can not even engage it at 20,000 meters, instead at 18,000 meters !!

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SanWenYu

Captain
Registered Member
.
The US lied about its F-119 engine.

Its real thrust is only about 140KN and its thrust to weight ratio is only slightly above 7 !!

The Chinese spy ballon tested it as F-22 can not even engage it at 20,000 meters, instead at 18,000 meters !!

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This has been proven false.
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Alfa_Particle

Junior Member
Registered Member
.
The US lied about its F-119 engine.

Its real thrust is only about 140KN and its thrust to weight ratio is only slightly above 7 !!

The Chinese spy ballon tested it as F-22 can not even engage it at 20,000 meters, instead at 18,000 meters !!

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Real thrust is still 156 kN (I've heard claims upwards of 170 kN), but the part where its T/W is 7 is true.
 

Alfa_Particle

Junior Member
Registered Member
Isn't that because the 2d tvc nozzle pretty bulky?
View attachment 145755
That, and the design philosophy of 5th Generation engine's engine architecture back in the 90s/00s. Enlarged core, notable increases in T4 temperature while the materials are unable to keep up, (which contributes to) redundancy measures, etc. made it very heavy. 2D TVC is definitely a huge part of it, but not all.

With modern materials and design, I think 9+ T/W is fairly doable for 5th generation engines.

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IIRC even with the nozzle off the T/W should be <9 including fluids and engine accessories.
 
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