Turboprops give you the benefit of very low maintenance and use of a common fuel. Piston aircraft require much more maintenance and use special fuel.
It's important to remember what a COIN aircraft is supposed to do and be; it is NOT a fighter, and it is NOT there to drop JDAMS. Other folks can do that.
At the altitudes you need to fly to be effective at COIN and the typical state of insurgent resupply, SAMs are not the biggest concern. Your biggest worry should be RPGs, Snipers, lucky riflemen and thrown spears, arrows and rocks....
Walter, a Czech company, makes a 600 hp turbine engine capable of propelling just about anything you really need in a COIN aircraft. I really haven't put much thought into the idea sense Burt Rutan floated his ARES concept in front of the US Army and got a bunch of officers and warrants fired for violating the Key West Agreement.
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