While I may not agree with the viability of building such a platform for Pakistan, I want to congratulate you. Few can think outside the box and you can. Pakistan needs more thinkers like you.I think the requirement is genuine. Navy really needs a platform that can provide patrol and strike capabilities to protect out maritime interests.
However JH-7, for all its capabilities is an old platform and might not be able to fulfill this desired role. While reading this thread, I was thinking on possible solution.
May I humbly suggest that a new dedicated platform is required for this. I think Pakistan Navy should take the initiative in this case and other branches (Air Force, Army) might join based on what capabilities new platform offers.
This new platform can be a joint venture with China. Nothing mentioned below is novel or extraordinary. I mean all these technologies already exists and as of now 2020, Chinese Aviation industry is well experience in design and development of home grown designs.
I suggest to built a big tailless delta with blended wing body around two Shenyang WS-10 engines. These engines are already being used in J10, J11, J15, J16. So it is already available.
Why tailless delta: lets check other platforms with two WS-10s like J11, J15, J16, these are by appearance more or less similar to SU27 family. Which is a very agile platform but was designed in an era where aircraft maneuverability was most important aspect. So the air-frame is good in producing lift and provide efficient control surface for better flight control. What is the down side? Radar Signature!
The suggested tailless delta with blended wing body would theoretically offer more internal fuel and better supersonic performance. Important thing to note here is that this platform is supposed to be more of a bomber than a fighter type. So desired characteristics are low radar signature and better supersonic performance.
For low radar signature, features from fifth generation aircrafts can be incorporated, major features should be
A: Better air intake design like J-20 or J-31 intakes for low radar signatures
B: Small vertical tail fins. Most probably in Y or X configuration.
C: Internal weapons bays: Most important requirement. Internal weapons bay would help in reduce the aerodynamic drag and radar reflections compared to weapons carried externally. Ideally this platform should have one main weapons bay under main fuselage and two supplementary bays in wings. Main bay should be able to carry two anti-ship missiles (like CM-400AKG, C-802AK). Or two Ra'ad (for air to ground role). Supplementary bays should be reserved for A2A missiles like PL-15 (two in each bay, 4 in total) and/or some Infrared homing as a last-ditch defense (PL-9, PL-10???)
D: Ability to fly low at high speed, sensors like FLIRs, IRSTs. I think WS-10 optimal performance altitude is medium to high. Some engineering wizardry might be required around air-intakes to offer optimal flow of air at low altitude??? Again, this is just loud thinking I don’t know how feasible this idea is.
E: To reduce cost, main fuselage and wings can be all metal like JF-17 but areas around air intakes, vertical fins, controls surfaces and weapon bay doors can be made of carbon composites (I think these offer less radar reflections, not sure about that).
F: Compared to other J fighters (J-11, J-15, J-16), based on two WS-10 engines, worst case scenario is this should have similar combat load range (1500 km). which is reasonable. Although I hope that a blended wing body with tailless delta would offer more internal fuel. To increase range, conformal fuel tanks or A2A refueling should be used. Would be wonderful if this platform can be designed to refuel like F-22 (it doesn’t have a refueling probe like other fighters. Instead the inlet is merged with body. (Do a google for “F-22 refueling” for better visuals).
G: Radar: Don’t know what AESA radar is used in other J-series fighters(J-11, J-15, J-16). But same can be used in this one. Although I would love to have something like SU-57 radar(N036 Byelka,1 nose mounted XBand AESA with 1552 T/R modules, two side mounted XBand with 358 T/R and two LBand Arrays in wings leading edges! Impressive)
In short this platform would be able to fly at low and medium altitude at high Mach speeds. Speed and low radar signature are of prime importance. With enough nose space to house a big AESA radar, such platform should be able to pick up enemy naval assets from a distance, fire Anti-ship missile and get out of there fast. The PL-15 mentioned above in supplementary weapons bay would be used to counter any enemy aircraft detected. Again it should be avoiding WVR fights as mentioned above, this platform is not designed for high G turns WVR fights.
Navy: Main operator should be Navy. Such platform can stay on patrols for long periods of time (compared to Mirage/JF-17s). can carry more anti-ship missiles and can have a bigger radar to detect enemy assets at longer distance. Other usage is in strike role. Should be able to fly at low altitude, carrying some Ra`ads and able to reach coastal cities/naval installations for surprise attacks.
Airforce: Realistically, it cannot be used for deep penetration missions as sooner or later, it will be detected. But can be used as a platform for standoff weapons like Ra`ad or other standoff weapons in air force inventory. Ra`ad MK2 has range of 600 KM. In future me might see versions with improved range. Having such a high speed launch platform at your disposal with long range stand off A2S missiles will force enemy to invest more in A2A defense.
Other usage can be long range A2A carrier (acting like an interceptor). Since it should have large radar and speed, would be an ideal platform for long range PL-15s volleys at enemy air assets. Leaving WVR fight to other dedicated platforms like JF-17, F-16 or Project AZM (when that is ready).
Army: Again, I cannot be used for CAS as it would be too big/costly for that. However, can be used for bombing enemy armored columns (Bombs with GPS enabled REKs, Other air to surface missiles that can be fired from a distance).
I think your design is very forward thinking and brilliantly conceived. This would be a first strategic aircraft platform for Pakistan with regional consequences (if it ever comes to fruition). It would not only allow what @MastanKhan has been asking for - a direct threat to India's soft underbelly, but would, as you rightly pointed out, allow extended patrols on the Indian Ocean.
Strategically this would help China as it would help them secure their shipping from the ME. For Pakistan, for the first time Pakistan would have real and threatening power projection capabilities, that only a major power has. It would allow Pakistan to nickel and dime Arab states and provide "support and protection".
If the future of Air War is in BVR combat, such a platform would be an ultimate BVR "frigate". With a powerful radar and bristling with BVRs, they would be force multipliers in large formation India-Pak air wars.
The giant delta wing would allow them to fly higher and faster than anything in the Indian subcontinent. They could be lobbing BVRs from 60K feet at hapless fighters below, giving them massive reach advantages. Imagine an ability to fire off a 10 BVR missiles, turn and scoot.
This in fact, may be the future of air warfare, not stealth.
Armed with long range AShM, they would be able to hunt enemy ships with impunity. One could imagine 4 supersonic / hypersonic missiles fired by a single aircraft, and to further confuse the ship's air defenses, log long ranged ARMs (Anti Radiation Missiles). So, a flight of two aircraft could lob 8x AShMs and 8x ARMs, completely overwhelming even a combined fleet air defense.
I doubt if even the USN would be able to tackle that. Please keep up the good work and don't stop your out of the box thinking.