TBH, I'm actually starting to consider the possibility where Northrop Grumman could've designed the B-21 into becoming some sort of a strategic-tactical, dual-role bomber on a single type of airframe. By designing the B-21 to be around one-third smaller than the B-2, the B-21 would carry less payload than the B-2, while having almost similar (or slightly shorter) range - In exchange for availability in greater numbers, since unit cost of B-21 would be comparably lower than the B-2. Combat losses of a single B-21 airframe would also incur less costs to operational requirements & battlefield planning, plus the (unregulated) finances of the Pentagon.If those engines would be WS-15s without the afterburner, two would be sufficient. However, if H-20 still uses WS-10 (without afterburner), maybe 4 would be necessary. However, as two WS-15 equipped H-20 would be somewhat similar in size with B-21 as opposed to the B-2. At the same time, it is totally possible that this picture is not accurate, and a super H-20 would have four WS-15s with a wingspan of 50-60 meters (payload of 45 tons). In that case, it would be the most powerful intercontinental bomber ever created.
Therefore, perhaps a super H-20 isn't exactly a good idea. Unless:
1. China can mass-produce the super H-20s like how the US is planning to procure 220+ B-21s; or
2. Build the rumored JH-XX in large quantities in order to shoulder the tactical bombing role, and let the super H-20s shoulder the strategic bombing role only.
Otherwise, a H-20 located somewhere between the range of B-21 and B-2 or slightly bigger than B-2 in terms of payload capacity would have to do.
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