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Kimmo Huosionmaa
One of the reasons, why SR-71 "Blackbird" was so expensive and many ways unpractical conception is that the technology, what have been used in this famous airplane was unique. The use of those about 30 airplanes was so expensive, that the program was terminated because USAF and CIA transformed to use spy satellites in the missions, what was reserved for those very expensive and secret airplanes, that could travel at the speed over 3 500 kilometers per hour.
Of course, that technology was not allowed to give into hands of the Russian or other states military intelligence. And that was the reason, why there were used so many unique components. Sometimes people talked that there was a robot version of that airplane. In this scenario, the SR-71 was equipped with the inertial navigation system and the clock, what allowed the plane fly autonomously in the Soviet airspace, and when this plane was going to airborne, there was used the remote control system. When the SR-71 went on the right altitude the barometric system would lock the control system, and the robot would transfer to flight by the control of the gyrocompass. When the mission would be done, the aircraft would decrease the altitude, and then the remote control would take the command.
That system would not be so difficult to produce because the system could get from the remote-controlled Walleye-bomb, and it would not be so expensive, what the people normally think. And when the SR-71 could bring back, there would need the visual recognition of that airplane. If the operator could not see the SR-71, the crew of the recognition airplane would use the demolition explosive, for denying the SR-71 security leak, what uncovers the secrets of that plane.
Some persons think that SR-71 was actually a cruise missile, what was build as the shape of the airplane. But there is no evidence about this kind of things.When SR-71 was sent to the mission, the airplane must first warm up its jet engines with normal fuel, and then this plane went to airborne, where it met the KC-130 Q "Stratotanker", what had special modifications for use of the high-temperature JP-7 fuel, what had very high flashpoint.
The use of this fuel needed that the airplanes motors were used because the temperature must be raised before the JP-7 can be injected into the motor. The high temperature allowed that the parts of the motors would settle down in the right position because all parts had little bit too small size. And the rise of the temperature caused that those parts were grown in the right size and until then the motor could give full thrust.
The prize of that program was expensive because there were used many unique parts and the reason, why that specially modified tanker was made, was that denied the jump over of the SR-71. The special modifications allowed the security operations for those airplanes, and all KC-130 Q:s were specially made for the unique individual SR-71. And many people believe that those prices were transferred to other military projects, what is not visible in the budget of Pentagon. '
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https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird
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