[Guest]

At the moment there is no way to simulate the opening/closing of the trop filter and hence the performance penalty (which was very limited) is not simulated. The trops though ARE restricted to 1.3ata and this is due to historic reasons. With delivery of the Bf-109G series came the new DB605 engine, which was still had teething problems (in particular diff gears and oil seals used to go). Many technical directives came out warning of such issues and many weren't taken seriously. The death of the famous ace Hans-Joachim Marseille (due to engine failure) then forced a ban on running the engine at 1.42ata boost. From then on, all Luftwaffe units were required to restrict output to 1292hp @ 1.3ata. This was lifted by mid 1943, well after the last 'Trop' variant came off the production line.

Hence when I made the Trop FMs, I placed this restriction in as these aircraft would have historically flown with power output restricted to 1292 at 1.3ata of boost. If you don't like to fly with this realistic feature in place, then you are welcome to select the non-trop variants Or do what some aces did, and complain and fly a 109F