Apparently, this is buggy to some point.
I just did another quick test, this time in the 109. At some point (~3000 meters) the plane started to vibrate (all temperatures in manual specified range) and even spat out a few clouds of black smoke.
Also (same as on the Hurricane), when the engine was pulled back to idle, the vibration would stop.
Kept climbing to around 6000 meters where the vibration got so bad that I decided I had enough.
Went into a prolonged dive, always keeping the temperatures at the same level. As soon as I went below ~3000 meters the vibration was gone, no more smoke or anything. Running smooth up (and quite a bit beyond) maximum performance specified in the manual.
Also, in neither of the two tests there was damage visible on the post-flight screen.
Test conducetd on the cross-boarders flight and on freeflight france.
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