[911nut]

When I worked at Pratt & Whitney in the mid '80's our facility in West Palm Beach rebuilt SR-71 engines for the Air Force. There was always 2 being rebuilt at any time and all were rebuilt after 100 hours of flight ops so they were busy boys then.
I had heard that the SR could achieve an altitude of 250k feet (essentially the edge of the atmosphere) and had a top speed of well over mach 3, more like mach 5 but that very well be misinformation.
The jet fuel used has such a high ignition temperature that it will put out a match. This was necessary because of the fuel tank leak issue the plane has.
The plane is painted with "ironball paint" that has iron flakes in it to absorb radar energy. Also, the tails that are angled toward each other deflect radar energy away from the reciever.