Bear in mind that it's not only the problem of copyright that makes this difficult; getting good quality sound recordings themselves. I'm a reasonably experienced amateur sound engineer, though only with music, but even that can be tough. Here's my particular thoughts on the problems I'd think about before I ran out the door with a mic in hand:
1) Is there a prototype flying? Ok for P-40s, Mustangs, Spitfires and Hurricanes and even Bf109s but what about original flying Klimovs? Or Napier Sabre? Or nearly any of the Japanese a/c for that matter?
2) Getting to said aircraft - whilst I have a nice selection here in the UK I'd need a sizeable travel budget to get out to some of the rarer birds.
3) Most do not operate at anywhere near wartime rated boost/pressure settings - you might extrapolate and synthesise but difficult to get right the true full power symphony from these motors.
4) Recording. In cockpit provides challenges - damping the vibration from the airframe being one - but we still run into problem 3). Also how do you get good external? From ground for fly-bys might be ok but for true non-dopplar recording? Ever tried shoving a mic into a 200mph+ gale? Lol! Guess what you're gonna hear and in won't be much engine noise!
Not trying to be defeatist, but just illuminate some of the issues TD has regards getting good, authentic and legal sound for an overhaul.
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