IO540
“I'd expect "vintage types" to rarely infringe airspace. Most rarely fly and when they do they don't venture very far and stick to the well travelled locality.”
What do you base this on? The average 1940’s aircraft at my local strip visits Europe several times a year and three of them are off to Norway in a few weeks.
Other "rag and tube" types (microlights) generally won't get picked up on radar and when they do there won't be any altitude info so level busts won't be detected.
I think this is completely incorrect. Most “rag and tube” types are SEP and handled by the PFA. The Super Stinker Pitts with its 250hp engine which parks next to me would make a very interesting micro!
Rod1