Man now i would like a subscription to facts that are SR-71. This is my favourite. There literally was no material that could seel the fuel tanks at that temperature, so they used expansion that is thermal thats how ...
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- Man now I want to subscribe to SR-71 Facts.
- This is my favourite. There literally was no material that could seel the fuel tanks at that temperature, so they used thermal expansion, thats how extreme the vehicle was/is. The high temperatures generated during flight required special design and operating techniques. For example, major portions of the skin of the inboard wings were corrugated, not smooth. (Aerodynamicists initially opposed the concept and accused the design engineers of trying to make a Mach 3 variant of the 1920s-era Ford Trimotor, known for its corrugated aluminum skin.) The heat of flight would have caused a smooth skin to split or curl, but the corrugated skin could expand vertically and horizontally. The corrugation also increased longitudinal strength. Similarly, the fuselage panels were manufactured to fit only loosely on the ground. Proper alignment was achieved only when the airframe heated up and expanded several inches. Because of this, and the lack of a fuel sealing system that could handle the thermal expansion of the airframe at extreme temperatures, the aircraft would leak JP-7 jet fuel on the runway. At the beginning of each mission, the aircraft would make a short sprint after takeoff to warm up the airframe, then refuel before heading off to its destination. http://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Airframe
- That's amazing, thanks for sharing.
- My favourite fact is the time it was designed and built, in the frigging early 60s. The entire design process was done by hand, CAD didn't exist then, every calculation was done either by hand or on a handful of very large and basic computers. It had just been a bit over 20 years since the first jet powered flight and they went and constructed this thing, which hasn't been surpassed in terms of raw speed until today, using pretty much just pen, paper and the equivalent of modern day wrist watch calculators.
- And then we landed people on the moon.
- ...with only 74Kb worth of coding...
- I read a story from a pilot where its SR-71 disintegrated during flight. One pilot was killed instantly while the other was thrown out to be the first human to experience a supersonic fall. So in a way, Felix Baumgartner was not the first person to reach supersonic free fall. Alltough Felix started with approx. zero kinetic energy. http://forums.ubi.com/showthread.php/548294-OT-SR-71-Disintegrates-Around-Pilot-During-Flight-Test-Aviation-Week-Space-Technol-Forums
- Actually Joe Kittinger beat those guys to the punch.
- Joe Kittinger didn't go supersonic though. Speed of sound at 5500 m is 1146 km/h, when according to wiki he opened at 988 km/h. Now I know this is nitpicking, but Mach 0.86 isn't really the same as Mach 3.2.
- The speed of sound varies based on Atmospheric Variables, such as air density, and temperature. info Also Joe and Felix achieved these speeds without the use of external propulsion, thus putting them in a different class all together compared to the pilot of the SR-71. I will concede after reviewing the numbers that Joe more than likely didn't break the Sound Barrier. But the dude was still hauling the mail. And at best was only off the mark by about 45 mph. Which at those speeds is right on the ragged edge. Edit: The opening your referring to was a drogue chute, not the main. Which he deployed at altitude after initially stepping out of his vehicle. Take away the drag of that chute, and I bet he would have been on the money for the Speed of Sound. just sayin.
- I know how speed of sound works. I did the calculations for Joe. Mach 0.82 is transsonic at best so it is not a 45 mph difference. In my first comment I stated: Alltough Felix started with approx. zero kinetic energy. So I'm aware of the fact that Joe and Felix didn't have external propulsion. I was just stating a cool fact in addition to this thread. Why can't we have nice things without people being pedantic?
- Sorry man didn't realize I was being pedantic. I was just discussing my understanding of the information.
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