H-20 bomber (with H-X, JH-XX)

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henrik

Senior Member
Registered Member
Kalec said:
Rough translation with no personal comment. You guy could check his credibility though. Source: 两根牙签wxl

Translation:
1. September 19, 2022, No. 6 Prototype was rolled out. No. 5 Prototype was rolled out on 09/27. (Some delay)
2. No. 1 and No. 2 technology demonstration aircraft were completed in the second half of 2016, similar in appearance to the b2, twin-engine, and underpowered, and this design was scrapped.
3. The 3rd and 4th demonstration aircraft were completed in May 2018.
4. Xi'an AVIC completely scrapped the original plan, two years later to adopt WS18. due to thrust insufficiency, bench resonance problems, overturned.
5. No.5 prototype was completely dismantled and the original power plan was rejected.
6. No. 6, using the original design power plan, the construction was completed in September 2022.
7 Production cost is about 3.8 billion yuan for a single aircraft, and no more than 40 aircraft will be equipped. Annual production is 5-6 aircraft.
8 In January 2023, the H20 begins large area fatigue tests and formation flights in the Northwestern China.
9. More details are inconvenient to disclose. (No. 7 has been rolled out, No. 9/10 in preparation for manufacturing.)


Translation: The 5th and 6th prototypes have improved landing gear compared to the 4th prototype. The overall landing gear size has been increased by using stronger steel.

Improved the material of the APU lower fuel guide tube, and the double fuel guide tube was changed to a metal-rubber-metal triple cladding material.

The fuselage material has been improved, using a more conservative proportion of aerospace alloys than in the 4th prototype. The proportion of carbon fiber composite material is less than that of the No. 4, also increased the weight.

Improved engine nickel-based alloy flame retardant bulkhead material and thickness.

The angle of attack detection alarm system was improved, and the freeze and moisture protection devices were added. 6 for the JH-26 and 8 for the Night Owl.

Improved the built-in pumping gas detection and alarm system in the cabin.

Some personal comment here:

I think it is likely that the OP is right on some parts of the H-20 story but JH-26 is one of the IQ detectors when it comes to credibility of Chinese rumor mill here. Anyone who brings up JH-26 and H-20 in a single post, is very likely spreading BS right there.

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That would be great if they have 10 stealthy "prototypes" in testing.
 
H

H2O

Junior Member
Registered Member
Deino said:
The only interesting issue besides all rumours for me is simply: WHEN will it be unveiled?
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IMHO, it'll be long after the US release the IOC version of the B-21. China doesn't have any pressing need to unveil the H-20 as they already have a few projects in the public eye (i.e. carrier, J-35, J-15T, etc...).
 
R

reservior dogs

Junior Member
Registered Member
ChongqingHotPot92 said:
For stealth bombers, it is better to use small diameter low-bypass turbofan engines like WS-10 and WS-15 to increase stealth. If you install the WS-20, the massive blades could reflect large amounts of radar wave.
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Given that the H-20 will most likely be subsonic, I wonder even without afterburner, they will have to re-engineer the WS-10/WS-15 to optimize for subsonic flight?
 
by78

by78

General
An
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that might have something to do with the H-20, but it could equally apply to future strike UCAVs, so sharing it here just in case. The paper deals with the turbulent flows experienced by open weapons bays during flight. Of interest, the study paid special attention to tandem cavities/weapons bays, calling it an important arrangement for future weapons bay design. The paper focuses on simulating airflows around open tandem bays when a hypothetical airframe is flying at Mach 0.85. The tandem bays each has a length-to-depth (L/D) ratio of 3.5, which are obtained by dividing a longer bay (L/D ratio of 7) in half with a metal plate.

Abstract: With the development of computational fluid dynamics (CFD) technology, the hybrid Reynolds averaged Navier-Stokes (RANS)/large eddy simulation (RANS/LES) method has been increasingly applied to the simulation of large separation flows and aeroacoustics in the aviation field, and fine results have been achieved. In this paper, the
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model is selected to validate the hybrid RANS/LES method under the condition of Ma=0.85, and the grid sensitivity analysis is carried out. Then, several key factors affecting the cavity flow are simulated, and the main results are obtained. Finally, the flow characteristics of tandem cavities with L/D=3.5 derived from a cavity with L/D=7 through inserting a plate in the middle are studied.
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52788462774_55d475aa65_k.jpg
 
T

taxiya

Brigadier
Registered Member
by78 said:
An
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that might have something to do with the H-20, but it could equally apply to future strike UCAVs, so sharing it here just in case. The paper deals with the turbulent flows experienced by open weapons bays during flight. Of interest, the study paid special attention to tandem cavities/weapons bays, calling it an important arrangement for future weapons bay design. The paper focuses on simulating airflows around open tandem bays when a hypothetical airframe is flying at Mach 0.85. The tandem bays each has a length-to-depth (L/D) ratio of 3.5, which are obtained by dividing a longer bay (L/D ratio of 7) in half with a metal plate.



52788462774_55d475aa65_k.jpg
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Well, I think the paper regards "tandem weapon's bay" as an alternative worth to investigate, rather than something better if that is what you meant to say by "Of interest, the study paid special attention to tandem cavities/weapons bays, calling it an important arrangement for future weapons bay design."

The article states "采用跨声速的串联空腔布局形式是未来武器 舱设计的一个潜在特点［5］". Tandem bay is a potential choice and worth to study. The reference 5 is study from UK
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Abstract​

An experimental study was conducted to analyse the pressure distribution along the floor of a cavity, with and without the presence of an upstream tandem cavity, at a constant freestream Mach number of about 0-911. Measurements were made for single cavities and the results compared with those obtained in the presence of an upstream tandem cavity. This comparison was made over a wide range of geometries, covering open to closed classes of cavities with both identical and different dimensions for the two cavities. The effect of the spacing between the two cavities was also studied. The downstream cavity is shown to be significantly affected by the presence of an upstream cavity, with both the overall net static pressure and its gradient being affected, dependent upon the class of cavity geometry and spacing under consideration.

From the abstract, we can see that they are investigating the impact of the airflow from the front bay to the aft bay. It does not say any advantage of tandem bay. I highly suspect that this study is driven by BAE Tempest which is very likely a tandem layout by looking at the mock-up.

The Chinese paper's conclusion is that the front bay acts as a typical L/D=3.5 bay, the aft bay is affected by the front bay. But the paper does not elaborate on whether the impact is good or bad or nutural.
 
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