J-20 5th Generation Fighter VII

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plawolf

Lieutenant General
But what is the purpose of the corkscrew maneuver? It still can't escape from a missile.
This is an offensive move, not a defensive one. The corkscrew demonstrates incredible nose pointing authority, that means you can save time and energy just pointing your nose at an opponent when they thought they were in a safe and good position to send a missile their way instead of doing it the old fashioned and hard way of beating him ‘fairly’ in a dogfight.

And unlike conventional jets with good nose pointing, the J20 can continue to climb when pointing its nose, meaning it’s not bleeding all of its energy just to get one snapshot attempt.

It’s only looking sluggish at the end due to the continuous corkscrewing and climb while doing so. But in a real fight, it would have loose a missile and returned to normal flight within the first pans or two, meaning minimal airspeed and energy expenditure for a very likely kill and not making itself vulnerable due to ending up in a low energy and airspeed state and needing time to recover.

A typical merge with a J20 would involve the J20 coming in fast, doing a pan, loosing a missile, (optional recovery move to recover some airspeed), do another pan to loose another missile at a (probably) second target, return to normal flight and afterburning out of the merge before the other guy(s) targeted even finished ejecting.
 

56860

Senior Member
Registered Member
Bro will they change the design to suit the performance of WS15 TVC like removing the rear strake?
Rumored WS-15 powered J-20 will not have twin dorsal fins because in built TVC will compensate for loss of maneuverability. J-20 stealth will improve without those fins.

source =CMA Blog by Huitong:

A recent image (June 2021) suggested that a single WS-15 engine with a TVC nozzle was fitted on a J-20 (Status III, the full status) engine testbed at CAC. The axial-symmetrical TVC nozzle appeared similiar to that of the WS-10B3 engine tested earlier onboard the J-10B TVC demonstrator. Consequently the twin ventral stabilizing fins might have been removed to reduce weight and RCS. Currently at least one J-20 (III) has been undergoing test at CFTE since late 2021.

There is even more stealth gains that can be made by reducing control surfaces especially vertical control surfaces. This is all made possible due to WS-15's TVC.
 

ZeEa5KPul

Colonel
Registered Member
Bro will they change the design to suit the performance of WS15 TVC like removing the rear strake?
Do you think plane parts can go on and off like Lego pieces? The strakes are there to provide yaw stability so the small moving V-tails don't throw the plane into uncontrollable spins. Removing them fundamentally alters the J-20's aerodynamics to an extent where its entire FCS would have to be rewritten at the very least.

Why do you think the strakes need to be removed in the first place?
There is even more stealth gains that can be made by reducing control surfaces especially vertical control surfaces. This is all made possible due to WS-15's TVC.
Removing the strakes would expose the nozzle from the side and worsen RCS.
 

ZeEa5KPul

Colonel
Registered Member
I am not an aerospace engineer so I am not going to involve myself in an argument on this topic. This is just from a source I found online. We will see when WS-15 comes online and iterative upgrades are made.
You don't need to be an aerospace engineer, just understanding some very basic principles about RCS optimization is sufficient:
J-20.jpg
One of the most important principles is to reduce the number of unaligned surfaces. Take a look at each strake and the V-tail on the opposite side - you'll see that they're parallel. There's a lot more to this, like the intakes, sides of the plane, and even a tangent line on the lower canopy are all parallel. The reflections from an EM emission source like a radar are all moving in the same direction, away from the radar.

You'll see this sort of "parallelism" everywhere. In fact, I just noticed that the side facets of the ETOS window under the J-20's nose are also parallel to the features I discussed. It's a very tight requirement for a VLO design, and removing the strakes exposes the cylindrical nozzles. A side-view cylinder is just about the worst thing you can present since a radar looking at it from any angle has a tangential plane on the surface reflecting back.

The take away is it's not the number of surfaces that's the issue, it's the number of unaligned surfaces.
 

Deino

Lieutenant General
Staff member
Super Moderator
Registered Member
According to lyman2003 on Weibo.

from 2023, 60 units of J-20 will be produced in a year.


Well … already now some say there are about 40 produced per year since 2020/21 but this does not fit to the number of J-20s in service … as such I‘m not only sceptical with the 40 but even more with this even higher number.
 
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