Is 71 Cold - Cold War Era Homepage Former USAF Entertainer Explains Why The Iconic SR-71 Blackbird Can Barely Go Above 85,000 Feet
During its nearly 24-year career, the iconic SR-71 remained not only the world's fastest aircraft, but also the world's tallest operational aircraft. On July 28, 1976, SR-71 61-7962 actually set two world records for its class - an absolute speed record of 2,193.167 km/h and an absolute altitude record of 85,068,997 feet (although SR-71 61-7953 feet reached unofficial to 70686 feet).
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"According to Richard Graham, an SR-71 pilot and wing commander of the 9th Strategic Reconnaissance Wing, the SR71 flying at 85,000 feet pushed the throttle very close to maximum," said Stephen Gandy, a former member of the 9th Field Maintenance Squadron (FMS) Branch Drive at Yale Air Force Base (AFB) in Quora.
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"The engine, unlike any turbojet I've known, can run at maximum afterburner indefinitely so that's not the problem. The flight instructor therefore limited the airplane to 85,000 feet unless specifically authorized. There's also a ratio that needs to be maintained between bypass doors the front and rear inlets. Also, around Mach 3.2 is about where the intake engine temperature is limited. Every engineer leaves a safety buffer. During a flight to an air museum, the Pratt engineers let the crew go to 3.5 because the engines would never fly again and I didn't mind wondering if The engine was lower. There are some pilots who boast as high as the A-12 but this plane is lighter so the 427 degree J58 compressor inlet temperature is not reached until up there at 90,000 so the pilots who say they exceeded that are story embellishments or they abused the plane and endangered aircrews who later flew the plane unless maintenance caught the possible damage or the engineers approved another run or a dual engine replacement.'
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"As with speed, pushing the plane beyond the limits set by Lockheed will entail risks. Over Libya they went 0.2 mach above the 3.3 limit for a short period, but exceeding the engine inlet temperature limit means the risk increases again. I guess they wrote it to that maintenance and tech could monitor more closely or replace an engine unless the technician decided it was in a safety buffer zone. I've never heard of the plane normally exceeding the altitude limit. If someone loses control of the SR-71 and it starts stalling it will break.
"They installed a climb limit indicator in addition to the ADI [approach direction indicator] because going through a narrow window (90 knots) of climb at Mach 3 breaks the plane apart. So who wants to ignore the flight manual? There was no need for a daylight mission. They used a check of Pitou and horizons off the nose to make changes, about a quarter of an inch high, but they couldn't see it at night. A stall causes the cruise altitude to rise and then break up. It stops low, it falls like a swinging leaf nose. Pancakes. Do it on Bill with Approaching. They went out.'
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"They changed the ADI to show more sensitivity at altitude at night. Also shot a laser beam over the front cockpit to prevent vertigo. Some of this comes from Charlie Dove's pilot. He says any flight much above 85,000 is bullshit in the SR -71. His words. For the SR. It was not the A-12. I've seen veteran pilots give lectures on the A-12 say the A-12 is lighter and can go to 90,000k feet in the J58 flight manual It was still the same with a temperature limit of 427 degrees on the compressor inlet.'
Dario Leone Dario Leone is an aviation, defense and military writer. He is the founder and editor of "The Aviation Geek Club", one of the most read military aviation blogs in the world. His writing has appeared in The National Interest and other news outlets. He reported from Europe and flew Super Puma and Cougar helicopters with the Swiss Air Force.
Military aviation / SR-71 Blackbird Watch this clip and learn about the SR-71 BLACKBIRD, the fastest plane in the world July 15, 2017 by Gabriele Barison Cold War era / Military aviation List of fastest flights ever recorded by a Blackbird Highest known Blackbird 2Ma2B LeonyB evertime War / Military Aviation / SR-71 Blackbird Photos Show Santa Collection SR-71 Blackbird Mach 3 Spy Plane December 25, 2018 by Dario Leone
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This integration of Google Analytics anonymizes your IP address. The anonymization works by shortening the IP address of the users within the borders of the member states of the European Union or other countries that are members of the agreement on the European Economic Area. Only in exceptional cases will the IP address be sent to Google servers and shortened within the US. Lockheed's Cold War-era SR-71 Blackbird patrol plane is indeed a strange bird - the plane's gas tanks constantly mist gas until the plane takes off, then heat up and expand. Credit : Wikimedia.
Several years ago, I toured Edwards Air Force Base, which sits on a large dry lake bed in southern California and provides plenty of space for testing new aircraft.
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Besides a well-known history of flight testing, the base is home to many different "birds," and you never know what you'll see—everything from B-2 bombers to the latest fighter jets.
(Astronaut Gordon Cooper admits to seeing a UFO land on the dry lake bed, where it sat for a short time and took off again!)
But on this particular trip we faced a dark black SR-71 Blackbird spy plane on the runway, the first time I had ever seen such a beast in person.
While I was shooting quickly, I remember the instructor telling me that the refueling crew hates working on the SR-71, for the very scary reason that it keeps leaking fuel.
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That's because the tanks don't expand and seal until the SR-71 takes flight and warms up at its top speed of Mach 3.4—a terrifying sight for any tanker crew in the SoCal heat.
Well, leave it to our Australian friends to come up with an amazing solution to the SR-71's expanding fuel tank problem, and many other potential applications as well.
A group of researchers from the University of New South Wales (UNSW) created what
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