J-21/J-31 Chinese 5th Generation Stealth Fighter

scatterStorm

Senior Member
Joined
May 28, 2016
Messages
1,844
Likes
3,857
Country flag
another 'old' image about the PT-31003- the 3rd prototype of FC-31 porject, but it is also the second flying FC-31. normally the PT-02 is for the ground tests(statics and fatigue tests).

FC-31 project is the export one.., the first prototype for PLAN --the domestic project(J-xx) is about to debut..

Main wings have an F22 raptor resemblance, Tail wing have SU57 resemblance. I don't see an IWB.
 

shiphone

Senior Member
Joined
Nov 9, 2009
Messages
1,943
Likes
1,939
Country flag
oh,we should have seen the second prototype of FC-31 project -the '31002' (PT-002). the image is right on the first page of this thread.

------------
a screenshot of a video which is not new neither.



-------
this prototype(PT-003) had the maiden flight in late 2016...


-------------
and if somehow the "serrated nozzles " became some kind of the ’Must', I think it is also there. we might be able seen it revealed with new J-XX prototype .

the WS-13E varient with serrated nozzle
 
Last edited:

MiG-29SMT

Regular Member
Joined
Jan 12, 2020
Messages
465
Likes
738
Country flag
Main wings have an F22 raptor resemblance, Tail wing have SU57 resemblance. I don't see an IWB.
quite unlikely there is a new aircraft, why? simple, the core of a new jet specially for a 5th generation aircraft is the engine.

What engine can you use for such project?

single engine? they need an engine like f135 of at least 18-19 tonnes of thrust.

twin engine?

well they need engines smaller than the ones on Al-31 basically EJ-200 or RD-93.

but already it has RD-93, consider J-31 should be in the range of 13 tonnes, MiG-29 is almost 11 tonnes empty and same Eurofighter without weapons bays.

Question for a naval aircraft to be better than Su-33/J-15 needs more paytload, something J-31 has not.


Now how can you see Chinese has not achieved at least an engine like that?

If you see S-70 uav is huge because it has a 117 and soon type 30 jet engine
1600222839490.png

1600223222840.png


Lijian is smaller meaning has not an engine to give it high performance and higher payload than S-70, thus is unlikely they have a better J-31 coming up unless they have a really powerful engine



1600223045543.png
 

MiG-29SMT

Regular Member
Joined
Jan 12, 2020
Messages
465
Likes
738
Country flag
1600223970774.png

lijian with RD-93
1600224010678.png


1600224061530.png



is easy to see, J-31 is very deficient in range and payload too much space for engine volume and intake airducts

1600224185828.png


F-22 is chunkier thanks to more powerful engines
 

MiG-29SMT

Regular Member
Joined
Jan 12, 2020
Messages
465
Likes
738
Country flag
The F35 comparison tells it all, a right comparison should be he F35 with J31
China wants to make a F-35 type fighter of J-31 but lacks a right engine,


F-22 is a small aircraft, it is 19 meters long because of its tailplanes are far off the nozzles tips, but its general fuselage is only marginally longer than J-31.

this picture shows that F-35 has a fuselage marginally smaller than the F-22`s fuselage.

F-15 is indeeed bigger than F-16 by a big margin, but F-35 in reality is not that small compared to F-22
1600294326334.png

Thus F-35 was made with a single engine, why?


The americans have the engine powerful enough F135, China has not engines as powerful as F135, thus they added 2 engines to have the thrust of a single f135.

this means twice the space in cross section and almost the same length, thus if the J-31 has similar length to F-35 you need different weapons bay arrangement.


1600294784592.png





The Chinese J-31 has a single weapons bay but has less space for fuel

1600295041887.png



As long as the Chinese can not have a good engine the J-31 baiscally is handicapped even as a naval fighter and you can see this

1600295272775.png


even for a MiG-29K with the same engines of J-31 is hard to take off, J-31 will not have a decent payload or range, consider modern ASM carried by western fighters and you will see F-18E is pretty much the king of naval fighers.
1600295702808.png


View attachment 59454
 

FOXBAT ALOK

Regular Member
Joined
Jan 11, 2018
Messages
108
Likes
304
Country flag
China’s New 5th Gen Fighter Aircraft J-31: Scrap or Masterpiece

source : https://defenceview.in/chinas-new-5th-gen-fighter-aircraft-j-31-scrap-or-masterpiece/


J-20 or J -31? The rhetoric of the PRC media is stirring up the idea that it is necessary to hurry up and urgently create its own fifth-generation carrier-based fighter – a competitor to the F-35. And let it be a modernized J-20 or J-31, or even a completely new development, but we must hurry! And on the Chinese Internet, the debate about which aircraft, the J-20 or the J-31, is best suited for landing on the deck of an aircraft carrier? In fact, China currently does not have a new generation carrier-based fighter.


J-31 prototype (31001)
J-31 prototype (31001)
The situation around China is turbulent. On the one hand, the US Navy, Air Force and Marine Corps continue to deploy fifth-generation stealth fighters in China’s periphery. On the other hand, China’s neighbors such as Japan, South Korea and Singapore have purchased and continue to purchase fifth-generation F-35 stealth fighters from the United States.


In the event of a military conflict, Chinese aircraft carriers will carry out regional missions to counter and prevent invasion. The J-15 Flying Shark and Zhi-18 fighters are currently the sole main force of the carrier-based aircraft of the Chinese aircraft carrier. The J-15 is a derivative of the Russian Su-27 fighter.

China continues to lack specialized electronic warfare and early warning aircraft. And most importantly, the J-15 cannot compete with the American F-35, which the Chinese Navy and Air Force planned to oppose with the J-20 fighters. They were designed to counter the F-35 and F-22 fighters.


Mock-up cockpit of the J-31 as it was shown in public
Mock-up cockpit of the J-31 as it was shown in public
The J-20 is China’s first fifth-generation stealth fighter in service. According to observers, its combat capability is comparable to that of the American F-22 fighter, and it is enough to counter the F-35 fighters. But if China wants to quickly develop a fifth-generation stealthy carrier-based fighter based on land-based aircraft, then the only prototype it can use is the J-31 ( FC-31 ), ideally it can compete with the F-35.


Traditionally, the Chinese media are getting ahead of ourselves and are already announcing the J-31 as ready to enter service with the PLA Navy. But this is not the case.

The design of the ground-based aircraft must be strengthened, which, of course, will lead to an increase in the weight of the aircraft and a decrease in combat performance. The technology of upgrading a fighter to a deck version, one way or another, will affect its aerodynamics, cockpit, structure, chassis, engine, electrical equipment and other components, and even brake cables on an aircraft carrier must be developed independently and for the upgraded apparatus.

When deciding how to upgrade and adapt the J-31 for operation from aircraft carriers, the main issue that causes difficulties is increasing the thrust of the J-31 engine. It is necessary to bring the thrust indicators to those parameters that would provide not only super-manoeuvrability but also the ability to take off from the deck of aircraft carriers without problems. Starting with Type 003, PLA Navy aircraft carriers have a flat deck. It is for this option that the newest Chinese fighter J-31 will be modernized. And although in the Chinese press, in recent years, they almost constantly declare a “breakthrough” in aircraft engine building, talking about the WS-15 engine with a thrust of 14.5 thousand kgf at a turbine temperature of 1400 ℃, but with the use of this power plant on fighters the new generation J-31 has difficulties.

J-31 at Airshow in China held in Zhuhai
J-31 at Airshow in China held in Zhuhai
Another problem is the increase in the range of combat use and missile and bomb load. The maximum take-off weight of the J-31, after numerous modifications, was increased to 28 tons. However, the mass of the mentioned missile and bomb load remained at the original level – up to 8 tons. The main focus was on increasing the fuel load in order to increase the range. Attempts to increase the payload are faced with, so far, insurmountable difficulties: either increase the volume of internal compartments, which will automatically lead to a decrease in the available volume for fuel tanks or hang weapons on external suspensions, which will actually lead to a levelling of stealth characteristics, which they like to talk about so much in China.

The J-31 was first shown to the public in October 2012, a mid-range, twin-engine stealth fighter with a lowered radar signature.
The J-31 was first shown to the public in October 2012, a mid-range, twin-engine stealth fighter with a lowered radar signature.
Unlike the J-20, which has an unconventional canard configuration for other fifth-generation fighters with a huge delta wing with influxes, forward horizontal tail and all-turning fins, the FC-31 is made according to the classical aerodynamic layout with a small trapezoidal wing and the same horizontal tail. … The two new Chinese fighters are related only to the external compression air intakes of the DSI type (the same ones are used on the F-35), and general approaches to ensuring the reduction of radar signature and equipment onboard equipment (including the use of radar with AFAR).

By the way, the new program for recruiting PLA Navy pilots for new-generation aircraft is designed for five years of training. Most likely, the PLA Navy plans that during these five years, the J-31 fighter will be upgraded to a carrier-based version
 

Global Defence

Articles

Top