A couple of quick missions using the H.75-4, testing the P&W R-1830 Twin Wasp engine.
There isn't the same problem with massive loss of power like in the Buffalo, but the bad engine damage model here is that even a very few .30 caliber bullets in the engine at 100-200 meters are sufficient to trigger a massive fuel leak (i.e., one that triggers the RTB result when the autopilot is on).
Comparing these hits to a 3-view drawing of the H.75, I can see nothing which could realistically cause a massive fuel leak. After all, even if the bullets hit the fuel intake to a particular cylinder, or punch a hole in the cylinder itself, there's not much more loss of fuel than that cylinder would consume normally.
3-View here:
http://www.histaviation.com/Hawk_75_...g_1424x926.jpg
2 .30 caliber bullets in the engine from about 100-200 meters away. Notice giant fuel leak and "RTB" message from AI
http://forum.1cpublishing.eu/attachm...1&d=1411449277
Same hits, but a different angle. Notice that there's no way that the bullets in the engine could have hit the fuel tank.
Different mission, same result:
http://forum.1cpublishing.eu/attachm...1&d=1411449337
Different view of the same hit:
http://forum.1cpublishing.eu/attachm...1&d=1411449337