posted on Mar, 26 2010 @ 12:07 PM
The performance capabilities of the Blackbird are no longer classified.
The maximum design cruise speed was Mach 3.2. Speeds of Mach 3.3 to Mach 3.5 have been recorded during test flights. Maximum speed was limited by
structural temperature restrictions (compressor inlet temperature had to remain below 427 degrees Centigrade).
Fastest known flights:
YF-12A (60-6936) – Mach 3.14 (2,070 mph), USAF, official record, 1 May 1965
SR-71B (61-7956) – Mach 3.27 (2,158 mph), NASA, unofficial, 14 December 1995
A-12 (60-6928) – Mach 3.29 (2,171 mph), CIA, unofficial, 8 May 1965
SR-71A (61-7958) – Mach 3.32 (2,193 mph), USAF, official, 28 July 1976
The Blackbirds were designed to fly as high as 90,000 feet, but typically operated between 70,000 and 85,000 feet. During Category II (Performance)
testing a USAF SR-71A reached an altitude of 86,700 feet, according to a declassified technical report. According to one of the test pilots, he once
took the SR-71 to 89,650 feet. As a single-place aircraft, the A-12 was considerably lighter than the SR-71. On 14 August 1965, a CIA A-12 attained an
altitude of 90,000 feet.
Highest known flights:
YF-12A (60-6936) – 80,257 feet, USAF, official record, 1 May 1965
SR-71B (61-7956) – 84,700 feet, NASA, unofficial, 18 October 1994
SR-71A (61-7962) – 85,068 feet, USAF, official, 28 July 1976
SR-71A (61-7953) – 89,650 feet, USAF, unofficial, 1968
A-12 (60-6932) – 90,000 feet, CIA, unofficial, 14 August 1965