Akh1112
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Ideally it should be singled engine aircraft. Challenge would be to obtain 1 x high power output engine that can be sourced without political issues and is economical to operate and maintain. I think if PAF is deciding to utilise 2 x Low-medium powered engines that can be because of inability of China & Russia to make excellent single high output engines. 2 engines mean double the probability of a break down, double the fuel cost, double maintenance cost & time, double the down time for servicing and for overhauls.
It would be interesting to see PAF's engine choice. If Russia can improve the RD33 engine issues in RD93MA model, then perhaps Pakistan can use 2 x RD93MAs in its 5th gen fighter too? I have read that Russia is also willing to install thrust vectoring nozzles on these engines if the customer desires. If we develop RD93 platform to a good level and use 1 engine across the board it would be great for cost, maintenance, logistics, training technicians.
No, PAF is looking for twin engines as the entire goal of this is to have a mirage replacement that can strike in the heart of India and come home unscathed. To do this effectively, you want to maximize internal payload carriage, for this, you COULD go for a smaller single-engined platform, or you could go for something larger and more spacious. Alongside this, you'd also have greater power generation from the engines meaning more power for onboard systems, allowing you to fit more capable ones if needed.