WI AK47 fighter jet

It will not be able to stand up to the modern fighter jets but it will be good in an ground attack roll. Some planes like that was developed, like the MFI 9 but they never got pushed into mainstream use, maybe because the military liked big, shiny toys.

It's shoulder-fired SAMs that did for piston engined aircraft over a battlefield. Back in the '60s, Cavalier Aircraft produced a modernized version of the Mustang specifically for the COIN role but its arrival coincided with the deployment of the SA-7 and an entire generation of lightweight, piston-engined combat aircraft were suddenly obsolete. These days a sensible air force uses jets (for escape velocity when chased by a missile), stays above 15,000 feet (negating the shoulder-launched SAM) and drops laser-guided bombs.
 
1. Single jet engine off the shelf.
2. Wolkovich (joined) wing for agility (at cost of range) for survivability.
3. Twin seat mod for training, or for guided weapons/electronics officer.
4. Hard points (4) for bombs, missile pod, specialised electronics pod, or fuel.
5. Single nose cannon for combat and some ground attack.
6. Light weight (fiber/plastic) for high acceleration.
You are still going to have to eat the fuel and maintenance cost of training if you want it to be worth something.
 
The FC-1, jointly developed by China and Pakistan, is probably the latest member of the Mig-21 family, but it's packed full with electronics even though the designs aims to minimize cost and maintainance needs. Frankly, even a light fighter requires a lot of advanced tech to survive in the modern battlefield.
 
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