Since the SR-71 is a perennial HN favorite: https://news.ycombinator.com/item?id=13567554 https://news.ycombinator.com/item?id=13567554 I think the StackExcha

Since the SR-71 is a perennial HN favorite: https://news.ycombinator.com/item?id=13567554 https://news.ycombinator.com/item?id=13567554 I think the StackExchange answer linked below covers interesting aspects of supersonic inlet behavior, but doesn't do a great job answering your specific question.