I've always thought the IL2 was just behind the Dora as far as glass radiators go. But it can also coast forever with prop feathered back and engine off, so I can normally land it with no issues, even with a blown engine... but yeah, it seems really weak for a 'flying tank'.
I think with the Dora to get it fixed, it took a couple people filming shooting the tail section with a 45 repeatedly and it scoring radiator hits before they looked into the damage model for that plane.
