J-20 5th Generation Fighter VII

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DaTang cavalry

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As per Henri K.:


The commander of the 1st Air Brigade, based at Anshan,
There is also talk of the formation of a third operational J-20 unit; this time in the Southern Theater Command.
However I'm not sure if this refers to the Scramble report or is an independent note!


At first I was only interested in his flight jacket, and then I noticed that he is a brigade commander, thank you for your information.
 

sequ

Major
Registered Member
Not everyone is going to read Song Wencong's paper and reason about the inherent agility of the canard+LERX planform.
I remember reading that there was a discussion or something like that among the designers of the J-20 or J-XX (?). They were discussing the choice between canards or LERX and one said 'why not both?'

Do you or anyone else for that matter have a link to the paper of S. Wencong? I want to know more about the canards+LERX combination now that the MIUS is basically a mini J-20. I would really appreciate it :)
 

ougoah

Brigadier
Registered Member
I remember reading that there was a discussion or something like that among the designers of the J-20 or J-XX (?). They were discussing the choice between canards or LERX and one said 'why not both?'

Do you or anyone else for that matter have a link to the paper of S. Wencong? I want to know more about the canards+LERX combination now that the MIUS is basically a mini J-20. I would really appreciate it :)

I don't recall the paper going into that level of detail. Those sorts of things are rarely exposed and if so, are often either part of disinfo campaigns (probably not in this particular case) or lacking in depth of detail.

We can however exercise some common sense and assume the designers applied a canards + LERX configuration of that exact form (for J-20) because it was at the time the most ideal solution available as a net compromise of every other engineering problem for the program. This would mean it is specific to the J-20's exact geometries, dimensions, materials, weight distributions, CoG, and everything else of some mechanical nature that has an impact or is a consequence of other non-aerodynamic design choices e.g. weapons, sensors, electronics etc.

How that translates to MIUS' aerodynamic performance would be yet another step in conjecture since we can safely assume the internals and every mechanical aspect of J-20 and MIUS would be extremely difference despite sharing a general similarity in geometry/configuration. That is to say, the MIUS designers wouldn't have "copied" from J-20, they would have considered those exact canard + LERX configuration to be coincidentally suitable for the purposes of the MIUS and all its corresponding engineering problems and solutions.

I'm not an aeronautical engineer but having seen some of those SAC papers that generally touched upon the mods and improvements to FC-31 to J-35, it does seem even millimeters worth of change can be significant enough in difference to the eventual performance of the aircraft.

What is commonly accepted is that canards vastly improve on the delta wing. Maybe LERX helps with some aspects in certain cases to make it worthwhile. We can then apply common sense to conclude that those cases coincide with both the J-20 and MIUS in uncertain domains (because we aren't the experts) but sure enough in such a way that their (expert) designers applied them.
 

siegecrossbow

General
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I think I've found a relevant paper with English translation over at pdf:
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In retrospect there are some differences between the airframe from Dr. Song’s paper and the J-20. The former uses a belly bay and close coupled canards and there hasn’t been any mentions of all moving vertical slabs.
 
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