Chinese Engine Development

gelgoog · 2025-09-13T03:08:12-0400

Oh right. I forgot Guizhou also makes the engines for the J-35. That engine core should have enough power.

FKAMtS4kE · 2025-09-13T03:11:25-0400

ACuriousPLAFan said:
- The H-20 could be using large-bypass engines, but I believe it won't be from the WS-18 series; instead, it will be a newly-designed engine.

Does anyone have any conceptual art on how a high bypass turbofan could fit in a stealth bomber? I struggle to picture how that would work while maintaining stealthy intakes and overall profile.

gelgoog · 2025-09-13T03:29:17-0400

It doesn't. The F-35 aka Fat Amy's engines the F135 has a bypass ratio of 0.57:1. The B-21 allegedly has a bypass ratio of 4:1. In today's nomenclature that is like medium bypass.

Tomboy · 2025-09-13T03:33:30-0400

gelgoog said:
It doesn't. The F-35 aka Fat Amy's engines the F135 has a bypass ratio of 0.57:1.

It does, PW9K has a BPR of 4.

gelgoog · 2025-09-13T03:35:01-0400

That is medium bypass. It might have been called high bypass in the 1980s.

Tomboy · 2025-09-13T03:36:42-0400

gelgoog said:
That's medium bypass.

If H-20 is actually going to be much larger than the B-2 I don't see how they can't fit a engine with BPR of around 5(Which is the bare minimum for high bypass) in there especially if they used a new compact core design

ACuriousPLAFan · 2025-09-13T04:27:46-0400

FKAMtS4kE said:
Does anyone have any conceptual art on how a high bypass turbofan could fit in a stealth bomber? I struggle to picture how that would work while maintaining stealthy intakes and overall profile.

Well, two main questions need to be answered:

1. Does the medium-bypass turbofan engine category actually exist? If so, what is its BPR ranges, which is situated in between the low and high-bypass BPR ranges?

2. What is the dimension of the smallest high-bypass turbofan engine with 10+ ton-force of thrust that is available today?

ACuriousPLAFan · 2025-09-13T04:34:15-0400

Tomboy said:
If H-20 is actually going to be much larger than the B-2 I don't see how they can't fit a engine with BPR of around 5(Which is the bare minimum for high bypass) in there especially if they used a new compact core design

Are the D-30KP2 and WS-18 considered medium or high-bypass engines?

Tomboy · 2025-09-13T04:48:43-0400

ACuriousPLAFan said:
Are the D-30KP2 and WS-18 considered medium or high-bypass engines?

KP2 has a bypass ratio of 2.24 which is on the lower end of medium bypass which apparently means a engine with a bypass ratio between 2 and 4.

gelgoog · 2025-09-13T06:20:55-0400

It used to be that a low bypass engine was something below 1. And high bypass was something higher than 1. But that has not been the case for a long time and so the medium bypass category came up.

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