China's transport, tanker & heavy lift aircraft

by78 said:

A nice comparison image.

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The fan blade seems to be no more than 1.75 meters. So it is still a CFM-56 class engine, which should have a thrust of 27,000 to roughly 35,000 lbf (not yet at the 18 tons level). Unconfirmed public sources mostly point to 31,000 lbf. But four of such engines would generate enough thrust equivalent to those of Airbus A340-200/300. Not the most efficient (still inferior to C-17's engines), but far better than those of D-30 engines.

I have long argued that China could use this thing for a militarised version of C919, such as AWACS, maritime patrol aircraft, special government transports, etc.

ChongqingHotPot92 said:

The fan blade seems to be no more than 1.75 meters. So it is still a CFM-56 class engine, which should have a thrust of 27,000 to roughly 35,000 lbf (not yet at the 18 tons level). Unconfirmed public sources mostly point to 31,000 lbf. But four of such engines would generate enough thrust equivalent to those of Airbus A340-200/300. Not the most efficient (still inferior to C-17's engines), but far better than those of D-30 engines.

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fan diameter is 2.1 meters.

bypass ratio is 6.0

maximum take off thrust is 35,000-36,000 lbf

cannot compare it with CFM-56. better material/components are available right now.

sunnymaxi said:

fan diameter is 2.1 meters.

bypass ratio is 6.0

maximum take off thrust is 35,000-36,000 lbf

cannot compare it with CFM-56. better material/components are available right now.

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Wait where did you get the 2.1 meters data from? Firstly, the diameter of the engine seem to be roughly the same (but not greater) than the person standing next to it. Assuming that person has a height of 1.75-1.8 meters, the engine's diameter should not be greater than that. Also, a fan of 2.1 meters could well generate a thrust of 40,000 lbf (18 ton class) just like the PW2000 or RB211 535 engines.

ChongqingHotPot92 said:

Wait where did you get the 2.1 meters data from? Firstly, the diameter of the engine seem to be roughly the same (but not greater) than the person standing next to it. Assuming that person has a height of 1.75-1.8 meters, the engine's diameter should not be greater than that. Also, a fan of 2.1 meters could well generate a thrust of 40,000 lbf (18 ton class) just like the PW2000 or RB211 535 engines.

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2+ meters fan diameter doesn't means thrust has to be 40,000 lbs ...

CJ-1000 has also 2+ meters front fan but engine's maximum take off thrust is 30,000-31,000 lbf

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WS-20 general specification are correct. i have my own source.

total thrust is classified information. so it can be plus/minus what i have post.

sunnymaxi said:

2+ meters fan diameter doesn't means thrust has to be 40,000 lbs ...

CJ-1000 has also 2+ meters front fan but engine's maximum take off thrust is 30,000-31,000 lbf

******************************************
WS-20 general specification are correct. i have my own source.

total thrust is classified information. so it can be plus/minus what i have post.

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Sounds like a less efficient engine in terms of size compared to the PW2000 and RB211 535 then.

ChongqingHotPot92 said:

Sounds like a less efficient engine in terms of size compared to the PW2000 and RB211 535 then.

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this is going to be long post. i hope you will read this.

total thrust cannot measure efficiency and performance of an engines..

there are three process that can define the ENGINE efficiency and performance

1. engine cycle design (that’s things like the number of fan compressor and turbine stages, and mechanical efficiency of the turbine, etc).

2. material quality, which determines “how hard and fast and hot can run this engine

3. and the most important is your production process quality.

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WS-20 gone from various process and changes in material/components since its first flight has taken back in 2013.

AECC confirmed in march. we have not yet selected the material of WS-20.

so most probably WS-20 engine materials have already been finalized. and i don't think so i need to tell where currently China stands in advance materials. so WS-20 engine will have latest material and components.




WS-20 initial target was 40,000 lbf class engine. but Liming faced many hurdles and bottleneck during its development. this project was the first proper high bypass turbofan engine in PRC aero engine industry. so they have decided to play safe and this is why it took so long for WS-20 to finish and completed first flight test in 2013. and Engine continue is in testing phase. its been 10 years already.

in 2022, Liming announced that 'the large bypass ratio turbofan engine pulsation assembly production line has completed'




now you see, WS-20 gone through very difficult process. and its been a long journey.

Liming also working on WS-20's advance variant. with more thrust and larger bypass ratio.

This coulc also mean new larger passenger/ cargo aircraft is in the drawing board.pershap an enlarge y 20 .

ChongqingHotPot92 said:

Sounds like a less efficient engine in terms of size compared to the PW2000 and RB211 535 then.

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You need to be aware of your defination of efficiency. Usually air-liner defines efficiency as thrust to fuel consumption, not necessarily related to fan size.

Self-explanatory.

Self-explanatory.