J-20 5th Generation Fighter VII


localizer

Major
Registered Member
A utility patent that might be of some interest. The illustration is obviously based on a J-20 fuselage, except the movable surfaces have been greatly modified to allow for flexible aerodynamic configurations. The link below contains a full English translation.

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Abstract: The invention proposes a kind of variant invisible plane and its changing method and applications.The aircraft is designed by stealthy requirement, moves canard and two deflectable formula slab tails entirely using lifting body strake wing allosteric type aerodynamic arrangement scheme, including two deployable and collapsibles. Deployable and collapsible canard takes in fuselage when aircraft cruises or high speed is flat winged, to reduce radar cross section, improves stealth. Deflectable formula slab tail is then deflectable to different angle under different flight state, thus as V-arrangement tail, horizontal tail or abdomeinal fin.The transformation of the aircraft aerodynamic arrangement, including canard configuration, anury formula layout and three-surface configuration are realized with this.The switching of three kinds of aerodynamic arrangements can combine the advantage of this three, preferably meet the requirement under each flight profile, mission profile and state of flight to air maneuver and stealth.The variant aircraft can be used as a kind of high lift-drag ratio, high maneuverability, the good someone of new generation of stealth and unmanned air fighting platform, for executing air superiority combat duty.





Nvm i guess it's like a tomcat vanes sorta

might as well just design a new jet with all those changes
 
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crash8pilot

Junior Member
Registered Member
How would one manage directional stability without v-tail? With TVC engines?

That config certainly has a bit of a 6th gen look about it.
Split rudder like the B-2


Based on the concept sketches the aerofoil seemingly forms an anhedral shape, which enhances directional stability
 

ougoah

Captain
Registered Member
How would one manage directional stability without v-tail? With TVC engines?

That config certainly has a bit of a 6th gen look about it.
Split rudder like the B-2


Based on the concept sketches the aerofoil seemingly forms an anhedral shape, which enhances directional stability
Will that be enough for a fighter? TVC being necessary for something like that J-20 is a given. Interesting there are some leaked concept drawings. Who's applying for these patents? If it's a government/AVIC project what's the point of applying for patents?
 

siegecrossbow

Brigadier
Staff member
Super Moderator
A utility patent that might be of some interest or at least interesting to look at. The illustration is obviously based on a J-20 fuselage, although this by itself doesn't mean the concept or idea necessarily has a connection with J-20 or has to be confined to J-20. Note the movable surfaces have been greatly modified to allow for flexible aerodynamic configurations. The link below contains a full English translation.

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Abstract: The invention proposes a kind of variant invisible plane and its changing method and applications.The aircraft is designed by stealthy requirement, moves canard and two deflectable formula slab tails entirely using lifting body strake wing allosteric type aerodynamic arrangement scheme, including two deployable and collapsibles. Deployable and collapsible canard takes in fuselage when aircraft cruises or high speed is flat winged, to reduce radar cross section, improves stealth. Deflectable formula slab tail is then deflectable to different angle under different flight state, thus as V-arrangement tail, horizontal tail or abdomeinal fin.The transformation of the aircraft aerodynamic arrangement, including canard configuration, anury formula layout and three-surface configuration are realized with this.The switching of three kinds of aerodynamic arrangements can combine the advantage of this three, preferably meet the requirement under each flight profile, mission profile and state of flight to air maneuver and stealth.The variant aircraft can be used as a kind of high lift-drag ratio, high maneuverability, the good someone of new generation of stealth and unmanned air fighting platform, for executing air superiority combat duty.





There might be more to this patent than you think.

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A CAC employee was recently commended for his hard work on a "special type of aircraft wing". Some people speculate that this involves foldable vertical slabs/canards.
 

Temstar

Junior Member
Registered Member
So people on that thread at cjdby are guessing that these variable geometry things are to optimise stealth. When cruising and needing to penetrate heavily monitored airspace you retract the canards and place the tail horizontal for optimum stealth (and there's probably some aerodynamic advantages, ala F-14's swing wings). When in combat and you need agility those things are extended.

Nice, it's got a whole "lock S-foils in attack position" thing going on.
 

Temstar

Junior Member
Registered Member
might as well just design a new jet with all those changes
Well they did say J-20 airframe was going to be a common platform for lots of things. I imagine this would be similar to a F/A-18C/D to F/A-18E/F type thing where it's indeed very nearly a new plane. If this thing does fly perhaps it would lead to a 5.5 gen fighter standard?
 

Bltizo

Lieutenant General
Staff member
Super Moderator
Registered Member
Well they did say J-20 airframe was going to be a common platform for lots of things. I imagine this would be similar to a F/A-18C/D to F/A-18E/F type thing where it's indeed very nearly a new plane. If this thing does fly perhaps it would lead to a 5.5 gen fighter standard?
It makes sense to do studies and patents for lots of weird and wacky configurations.

Whether any are pursued or not, is only something we can speculate on.


But the only variants we take seriously are the ones that are rumoured in the grapevine as being pursued, so far the only variants being a J-20 variant powered by WS-15, and another one possibly being a tandem twin seater variant.

Everything else depicted in various patents and studies is not worth putting too much thought into unless the grapevine or the insiders give indications that they're being actively developed, IMO.
 

plawolf

Brigadier
I am not sure about the retractable canard, but I think the folding tails are a stroke of genius that is easily attainable with existing tech levels, as they could pretty much go off-the-shelf with carrier fighter folding wings designs as a pretty good starting point.

Obviously they will need to put in place additional actuators and what not for the shape change, but the J20’s design already have plenty of room in the tail stings for those.

I think this is a pretty viable design that could potentially be incorporated into a future J20 version as almost a bridge between 5th gen and true 6th gens.

Mate the foldable tails with TVC WS15s and you could have one hell of a performer.

It is also worth noting that in the design, the tails appear to be able to fold both upwards and downwards.

Maybe they were just playing with various configurations, but it also opens up the possibility of dynamic positional changes during flight to further boost agility.

Aside from the obvious roll and pitch applications from asymmetrical canting of the tails, one particularly interesting potential application would be to maintain full yaw control authority during extreme high alpha manoeuvres.

One of the main issues with extreme high alpha manoeuvres is that the body of the plane start to block airflow to the tail, thereby causing you to loose yaw control authority, and in effect place a hard cap on how much AoA you can safely pull.

There are ways around that like sweeping the tail back and extending it past the wings, like on the J20, such that the tips are still exposed to incoming airflow to give you some yaw control. But that only gives you partial control as only a small part of your tails are getting any airflow.

With the tails canted downwards under the body of the plane, you can have full paw control authority irrespective of AoA. Not only would this allow you to pull higher AoA, but you will have much more responsive controls at those extreme AoAs.

I would not be surprised if we seen this being flight tested within the next 5-10 years.
 

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