TD does it for free and I agree they have right to choose what they prefer to improve. The only rule to observe, I believe, is "must be historical". I mean, since we want to have fun reenacting aerial warfare, it makes no sense everything that didn't happen or couldn't happen. Historical documents and law of physics are the sole means to get the scope; tales and legends do not bring anywhere. Today, there's still who think interviewing a WWII pilot can give proof of how it was or what really happened: false! Witnesses had a very limited and personal point of view. Try to ask a soldier who spent his time in a bunker how "really" evolved a famous battle: I think he know almost nothing. Pilots are neither designer nor engineer, just driver (with all respect for them), if you want accurately model how worked Kommandogerat you can't ask a surviving FW pilot.
So, are there official documents stating that "yo-yo" was actually performed (pilot's manual, training book, flight reports)?
S!
GB
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Ardisco, colpisco, meninfischio ("I dare, hit and do not care about it!" - Written on a SM 79 "Sparviero" during Spain civil war)