Forget VTOL... just imagine a
conventional version of the design. Basically a single engine stealth fighter.
The thought a was design like this with a WS-15 engine. A similar design has been consider by both the Swedes and the Turks. The Turks chose a twin engine design because of their requirements and the Swedes haven’t publicly revealed their next generation fighter.
Stealth may not be everything and maneuverability will still be important.
A design that could carry 4 PL-15 and 4 PL-10 internally would still be a considerably challenge to enemy forces.
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The Chinese may still have the J-18 program running. So it maybe a program to keep an eye on.
Pakistan does not need a VTOL fighter, but a conventional version of this design maybe what Pakistan can afford and in numbers down the line.
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More info on the J-18 at the following page:
The genesis of the original J-183 was in 1971, when the 601 Institute began researching a new fighter aircraft for the 1980s to replace the J-6
www.globalsecurity.org
The first quote in the following article quotes a Chinese source on the existence of single engine design
Naval news Defense : Coverage includes navy defense industry modern equipment, fleet updates, and maritime security.
www.navyrecognition.com
The benefit of one engine (really powerful engine) over two medium thrust engines, if both achieve the same total thrust will be in maintenance and logistics costs.