Interesting.
Electic's suggestion it was piggy backed aka the D-21 is the first time I've heard that.
Maybe that North Sea oil rig worker who saw the F111's escorting something very strange all those years ago wasn't imagining things.
I have a copy of Bill Sweetman's Aurora book.
And the planform of Aurora he sketches out is almost exactly the same as the SR-72.
A waverider with 70 degree sweepback, chines, sharp wingtips.
Intriguing.
Last edited by tartare; 1st Nov 2013 at 22:08.