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Old 07-15-2018, 12:21 AM   #1
odurandina
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Crashed his Blackbird.....

fantastic read.....

http://www.barthworks.com/aviation/sr71breakup.htm


Test Pilot Bill Weaver tells about a Mach 3.18 in-flight breakup

of his SR-71 Blackbird


Among professional aviators, there's a well-worn saying: Flying is simply hours of boredom punctuated by moments of stark terror. But I don't recall too many periods of boredom during my 30-year career with Lockheed, most of which was spent as a test pilot. By far, the most memorable flight occurred on Jan. 25, 1966.

Jim Zwayer, a Lockheed flight-test specialist, and I were evaluating systems on an SR-71 Blackbird test from Edwards. We also were investigating procedures designed to reduce trim drag and improve high-Mach cruise performance. The latter involved flying with the center-of-gravity (CG) located further aft than normal, reducing the Blackbird's longitudinal stability.


We took off from Edwards at 11:20 a.m. and completed the mission's first leg without incident. After refueling from a KC-135 tanker, we turned eastbound, accelerated to a Mach 3.2-cruise speed and climbed to 78,000 ft., our initial cruise-climb altitude. Several minutes into cruise, the right engine inlet's automatic control system malfunctioned, requiring a switch to manual control. The SR-71's inlet configuration was automatically adjusted during supersonic flight to decelerate airflow in the duct, slowing it to subsonic speed before reaching the engine's face. This was accomplished by the inlet's center-body spike translating aft, and by modulating the inlet's forward bypass doors.

Normally, these actions were scheduled automatically as a function of Mach number, positioning the normal shock wave (where air flow becomes subsonic) inside the inlet to ensure optimum engine performance. Without proper scheduling, disturbances inside the inlet could result in the shock wave being expelled forward - a phenomenon known as an "inlet unstart."

That causes an instantaneous loss of engine thrust, explosive banging noises and violent yawing of the aircraft--like being in a train wreck. Unstarts were not uncommon at that time in the SR-71's development, but a properly functioning system would recapture the shock wave and restore normal operation.

On the planned test profile, we entered a programmed 35-deg. bank turn to the right. An immediate unstart occurred on the right engine, forcing the aircraft to roll further right and start to pitch up. I jammed the control stick as far left and forward as it would go. No response. I instantly knew we were in for a wild ride. I attempted to tell Jim what was happening and to stay with the airplane until we reached a lower speed and altitude. I didn't think the chances of surviving an ejection at Mach 3.18 and 78,800 ft. were very good. However, g-forces built up so rapidly that my words came out garbled and unintelligible, as confirmed later by the cockpit voice recorder.


The cumulative effects of system malfunctions, reduced longitudinal stability, increased angle-of-attack in the turn, supersonic speed, high altitude and other factors imposed forces on the airframe that exceeded flight control authority and the Stability Augmentation System's ability to restore control. Everything seemed to unfold in slow motion. I learned later the time from event onset to catastrophic departure from controlled flight was only 2-3 seconds. Still trying to communicate with Jim, I blacked out, succumbing to extremely high g-forces. Then the SR-71 . . literally . . disintegrated around us. From that point, I was just along for the ride. And my next recollection was a hazy thought that I was having a bad dream. Maybe I'll wake up and get out of this mess, I mused. Gradually regaining consciousness, I realized this was no dream; it had really happened. That also was disturbing, because I COULD NOT HAVE SURVIVED what had just happened.

I must be dead. Since I didn't feel bad - just a detached sense of euphoria. I decided being dead wasn't so bad after all. As full awareness took hold, I realized I was not dead. But somehow I had separated from the airplane. I had no idea how this could have happened. I hadn't initiated an ejection. The sound of rushing air and what sounded like straps flapping in the wind confirmed I was falling, but I couldn't see anything. My pressure suit's face plate had frozen over and I was staring at a layer of ice.

The pressure suit was inflated, so I knew an emergency oxygen cylinder in the seat kit attached to my parachute harness was functioning. It not only supplied breathing oxygen, but also pressurized the suit, preventing my blood from boiling at extremely high altitudes. I didn't appreciate it at the time, but the suit's pressurization had also provided physical protection from intense buffeting and g-forces. That inflated suit had become my own escape capsule.

My next concern was about stability and tumbling. Air density at high altitude is insufficient to resist a body's tumbling motions, and centrifugal forces high enough to cause physical injury could develop quickly. For that reason, the SR-71's parachute system was designed to automatically deploy a small-diameter stabilizing chute shortly after ejection and seat separation. Since I had not intentionally activated the ejection system, and assuming all automatic functions depended on a proper ejection sequence, it occurred to me the stabilizing chute may not have deployed.

However, I quickly determined I was falling vertically and not tumbling. The little chute must have deployed and was doing its job. Next concern: the main parachute, which was designed to open automatically at 15,000 ft. Again I had no assurance the automatic-opening function would work. I couldn't ascertain my altitude because I still couldn't see through the iced-up faceplate.

There was no way to know how long I had been blacked-out or how far I had fallen. I felt for the manual-activation D-ring on my chute harness, but with the suit inflated and my hands numbed by cold, I couldn't locate it. I decided I'd better open the faceplate, try to estimate my height above the ground, then locate that "D" ring. Just as I reached for the faceplate, I felt the reassuring sudden deceleration of main-chute deployment. I raised the frozen faceplate and discovered its uplatch was broken. Using one hand to hold that plate up, I saw I was descending through a clear, winter sky with unlimited visibility. I was greatly relieved to see Jim's parachute coming down about a quarter of a mile away. I didn't think either of us could have survived the aircraft's breakup, so seeing Jim had also escaped lifted my spirits incredibly. I could also see burning wreckage on the ground a few miles from where we would land. The terrain didn't look at all inviting, a desolate, high plateau dotted with patches of snow and no signs of habitation.

I tried to rotate the parachute and look in other directions. But with one hand devoted to keeping the face plate up and both hands numb from high-altitude, subfreezing temperatures, I couldn't manipulate the risers enough to turn. Before the breakup, we'd started a turn in the New Mexico-Colorado-Oklahoma-Texas border region. The SR-71 had a turning radius of about 100 mi. at that speed and altitude, so I wasn't even sure what state we were going to land in. But, because it was about 3:00 p.m., I was certain we would be spending the night out here.

At about 300 ft. above the ground, I yanked the seat kit's release handle and made sure it was still tied to me by a long lanyard. Releasing the heavy kit ensured I wouldn't land with it attached to my derriere, which could break a leg or cause other injuries. I then tried to recall what survival items were in that kit, as well as techniques I had been taught in survival training. Looking down, I was startled to see a fairly large animal, perhaps an antelope, directly under me. Evidently, it was just as startled as I was because it literally took off in a cloud of dust.


My first-ever parachute landing was pretty smooth. I landed on fairly soft ground, managing to avoid rocks, cacti and antelopes. My chute was still billowing in the wind, though. I struggled to collapse it with one hand, holding the still-frozen faceplate up with the other.

"Can I help you? " a voice said. Was I hearing things? I must be hallucinating. Then I looked up and saw a guy walking toward me, wearing a cowboy hat. A helicopter was idling a short distance behind him. If I had been at Edwards and told the search-and-rescue unit that I was going to bail out over the Rogers Dry Lake at a particular time of day, a crew couldn't have gotten to me as fast as that cowboy-pilot had. The gentleman was Albert Mitchell, Jr., owner of a huge cattle ranch in northeastern New Mexico. I had landed about 1.5 mi. from his ranch house, and from a hangar for his two-place Hughes helicopter. Amazed to see him, I replied I was having a little trouble with my chute. He walked over and collapsed the canopy, anchoring it with several rocks. He had seen Jim and me floating down and had radioed the New Mexico Highway Patrol, the Air Force, and the nearest hospital.

Extracting myself from the parachute harness, I discovered the source of those flapping-strap noises heard on the way down. My seat belt and shoulder harness were still draped around me, attached and latched. The lap belt had been shredded on each side of my hips, where the straps had fed through knurled adjustment rollers. The shoulder harness had shredded in a similar manner across my back. The ejection seat had never left the airplane. I had been ripped out of it by the extreme forces, with the seat belt and shoulder harness still fastened.


I also noted that one of the two lines that supplied oxygen to my pressure suit had come loose, and the other was barely hanging on. If that second line had become detached at high altitude, the deflated pressure suit wouldn't have provided any protection. I knew an oxygen supply was critical for breathing and suit-pressurization, but didn't appreciate how much physical protection an inflated pressure suit could provide. That the suit could withstand forces sufficient to disintegrate an airplane and shred heavy nylon seat belts, yet leave me with only a few bruises and minor whiplash was impressive. I truly appreciated having my own little escape capsule.

After helping me with the chute, Mitchell said he'd check on Jim. He climbed into his helicopter, flew a short distance away and returned about 10 minutes later with devastating news: Jim was dead. Apparently, he had suffered a broken neck during the aircraft's disintegration and was killed instantly. Mitchell said his ranch foreman would soon arrive to watch over Jim's body until the authorities arrived. I asked to see Jim and, after verifying there was nothing more that could be done, agreed to let Mitchell fly me to the Tucumcari hospital, about 60 mi. to the south.


I have vivid memories of that helicopter flight, as well. I didn't know much about rotorcraft, but I knew a lot about "red lines," and Mitchell kept the airspeed at or above red line all the way. The little helicopter vibrated and shook a lot more than I thought it should have. I tried to reassure the cowboy-pilot I was feeling OK; there was no need to rush. But since he'd notified the hospital staff that we were inbound, he insisted we get there as soon as possible. I couldn't help but think how ironic it would be to have survived one disaster only to be done in by the helicopter that had come to my rescue.

However, we made it to the hospital safely - and quickly. Soon, I was able to contact Lockheed's flight test office at Edwards. The test team there had been notified initially about the loss of radio and radar contact, then told the aircraft had been lost. They also knew what our flight conditions had been at the time, and assumed no one could have survived. I explained what had happened, describing in fairly accurate detail the flight conditions prior to breakup.


The next day, our flight profile was duplicated on the SR-71 flight simulator at Beale AFB, Calif. The outcome was identical. Steps were immediately taken to prevent a recurrence of our accident. Testing at a CG aft of normal limits was discontinued, and trim-drag issues were subsequently resolved via aerodynamic means. The inlet control system was continuously improved and, with subsequent development of the Digital Automatic Flight and Inlet Control System, inlet unstarts became rare. Investigation of our accident revealed that the nose section of the aircraft had broken off aft of the rear cockpit and crashed about 10 mi. from the main wreckage. Parts were scattered over an area approximately 15 mi. long and 10 mi. wide. Extremely high air loads and g-forces, both positive and negative, had literally ripped Jim and me from the airplane. Unbelievably good luck is the only explanation for my escaping relatively unscathed from that disintegrating aircraft.


Two weeks after the accident, I was back in an SR-71, flying the first sortie on a brand-new bird at Lockheed's Palmdale, Calif., assembly and test facility. It was my first flight since the accident, so a flight test engineer in the back seat was probably a little apprehensive about my state of mind and confidence. As we roared down the runway and lifted off, I heard an anxious voice over the intercom. "Bill! Bill! Are you there?" "Yeah, George. What's the matter?" "Thank God! I thought you might have left." The rear cockpit of the SR-71 has no forward visibility - only a small window on each side - and George couldn't see me. A big red light on the master-warning panel in the rear cockpit had illuminated just as we rotated, stating: "Pilot Ejected." Fortunately, the cause was a misadjusted micro switch; not my departure.

....................
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Old 07-15-2018, 12:28 AM   #2
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Re: Crashed his Blackbird.....

Background on the SR-71;

http://www.historyofwar.org/articles...blackbird.html


Without doubt one of the most spectacular and distinctive military aircraft in history the SR-71 Blackbird played a vital roll in US Reconnaissance.

It was for many years and may still be the worlds fastest and highest flying air breathing machine and despite over two decades of top secret missions over such hostile countries as Cuba, North Korea and China has never been shot down. Flights over the former USSR were technically banned after the Soviets shot down the US U-2 spy plane in 1960.

By 1960 three mach 3 aircraft were under development, the A-12, YF-12 and SR-71, the A-12 flew in 1962, the YF-12 in 1963 and the first SR-71 on 23rd December 1964. The programme was kept secret until February 1964 when President Johnson made a television announcement. The A-12 was designed as a replacement for the U-2, it was a smaller lighter forerunner of the SR-71 and was operated by the CIA until the Blackbird became operational in 1968 under the US Air Force. The YF-12 was a long range interceptor that never went into production, its Hughes radar and AIM-47 missiles were later to be developed into the AWG-9 Phoenix weapon system on the US Navy’s Grumman F-14 Tomcat.

A mini Blackbird drone was also developed, the D-21. Ramjet powered and unmanned this project was designed to be launched from an A-12 mothership to fly at even higher speed over areas of interest. The project was abandoned after a fatal accident. It continued until 1971 with about 20 test launches from under wing pylons on B-52s. Formal Blackbird operations started in January 1966 when the first aircraft arrived at custom built facilities at Beale AFB California. During their history they also operated out of Mildenhall AFB in the UK (where the photos at the end of this article were taken) and out of Kadena AFB in Japan. During the Vietnam War they also operated out of Thailand and South Korea.

About 32 Blackbirds were made with only about 10 in service in any one time due to the massive demands made on the airframe; it is believed that 11 have been written off in accidents. The aircraft is two seat and pilots for it are some of the best in the USAF, before requesting to fly the aircraft they must have 1,500 of jet flying time be recon qualified and be well-experienced military navigators. They must then be checked out on the Northrop T-38, which has similar handling characteristics at sub sonic speeds and complete 100 hours simulator time before progressing to the SR-71B trainer. Full data on the Blackbirds performance was classified but released figures for the world speed and altitude records gained on 28th July 1976 are a speed of 3529.56km/h (2,193.17 mph) and a sustained height of 85,069ft (25929 m).

To deliver this performance the delta wing design is powered by two huge and incredibly noisy Pratt and Whitney J58 engines. These are rated at 32,500 lb of thrust at sea level in afterburner. A complex inlet, nacelle and ejector design modifies the airflow to the extent that at mach 3.2 the engines are only generating one tenth of the thrust, a Honeywell onboard computer controls this system. The outside airframe is subjected to temperatures as high as 500 Celsius or 932 Fahrenheit so had to be made of titanium alloys. To allow expansion the airframe has gaps and actually leaks fuel until heat expands and seals the gaps in flight. The synthetic hydraulic fluid almost goes solid below 30 Celsius.

So in the days of hi tech satellite imaging what use was and is a dedicated recon aircraft? Well Satellites have some limitations firstly their track is fixed so time is taken to move them over an area of interest and these moves can be seen by an enemy. They have a limited life in space and are expensive to launch and finally they can be attacked and destroyed by ground and air launched missiles and other satellites. Even if a recon aircraft cannot over fly a hostile country for military or political reasons, its high altitude can allow it to over look a wide area. It is believed the sensor systems on the Blackbird can survey 259000 km or 100,000 square miles an hour and probably include infra red and airborne side looking radar.

Preparation for a mission takes most of a day with the sensors taking the most prep, some sensors are modular with a whole bay being fairly easy to replace to swap say photo recon sensors for a radar package. Actual route and mission details are normally left to the last minuet for security reasons. The aircraft itself takes 2 ½ hours to prep for flight mainly due to warming the engine oil to 86 F. The crew under go a full medical before each flight and for high altitude nitrogen is purged from the body to prevent the bends by breathing gaseous oxygen for an hour before take off. Crew may also be given anti fatigue drugs and a special diet helps reduce bowel movement. The crew then put on their s-1010B full pressure suits similar to those used in space. 3 hours before the Blackbird takes off 3 KC-135 tankers will have taken off to head for prearranged refueling locations. The last tanker will take off just before the Blackbird and wait for it to top it up at 25,000 ft near to the airbase.

After take off and the top up the Blackbird will perform a manoeuvre called the Dipsy Doodle, here it passes mach 1 by a climb to 33,000ft followed by a sharp dive to allow the aircraft to traverse high drag transonic range without using a lot of fuel. The aircraft will then climb to at least 60,000 ft. From Mildenhall the Blackbirds would overfly East Germany, the Baltic and the Kola Peninsula.

The unrefuelled range of the SR-71 seems likely to be over 4825km (3,000 miles) and most missions last about 5 hours with several refuels at 25,000 ft, longer flights of 10 hours covering 15,000 miles have been undertaken. At high attitude and with various stealth technologies it is very hard to spot and may be able to reach 100,000 ft ceiling height. Very few aircraft could keep contact with the SR-71 except possibly the MIG-25 Foxbat and very few SAM could reach that altitude. Once the mission is completed the SR-71 is drained of oil while still hot and the crew undergo another medical check, they would then not be required to fly again for 48 hours.

The SR-71 was probably the most famous aircraft to come out of Lockheed’s famous Skunk Works, its amazing performance, futuristic looks and cloak of secrecy made it a very popular plane among enthusiasts. It was very much a product of the cold war but a vital intelligence asset that has served in many areas around the world. Its possible replacement the Aurora project is cloaked in secrecy and with the changing nature of warfare in the 21st century may be a very different aircraft.

.............................
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Old 07-15-2018, 01:04 AM   #3
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Re: Crashed his Blackbird.....

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