Ramshackle

In addition, if you have Simplified Flight Model turned on in the Options/Gameplay/Difficulties category, trim will not work on some of the warbirds.

Generally no. Either way, the pitot heat should work unless you burn it up by having it on when not flying. In the sim, the problem still occurs in clear, cold air, it just takes longer to show up. Hope this helps.

Here's a track of the pitot heat issue. Airspeed gauge becomes unreliable at 10 minutes in (fastest I could get it to occur). Remedied by returning to low altitude. P47PitotMaxdv.zip