That's Ben Rich's book, right? I have read it twice, and it's pretty incredible. And the amount of details he's had to leave out (such as creating a hybrid turb

That's Ben Rich's book, right? I have read it twice, and it's pretty incredible. And the amount of details he's had to leave out (such as creating a hybrid turbojet/ramjet engine nacelle or a top speed of around Mach 4) is also interesting. As an aside, I got to see (and surreptitiously touch!) an A12 in Seattle at the Museum of Flight recently, and it was just incredible.