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Originally posted by Zaphod58
The SR-71 leaked for a reason before take off. There was nothing TO fix about it. On landing the airframe was so hot it had stretched 3 inches or so. There were no fuel bladders that could take the heat, so the airframe was the fuel tank. If they didn't make it so that it leaked, it wouldn't have any room to stretch from the friction.
Originally posted by Aim64C
The conditions of the retirement of the SR-71 were rather odd... the plane is suddenly retired with no known replacement, other than the U-2 ...
At maximum output the fuel flow rate in the J58 is about 8,000 gallons per hour and the exhaust-gas temperature is around 3,400 degrees. The J58 required the use of a special AG330 engine starter cart to spool the engines up to the proper rotational speed for starting. The cart was powered by two unmuffled Buick Wildcat V-8 racing car engines which delivered a combined 600 horsepower through a common gear box to the starter drive shaft of the aircraft engines. The J58s had to be spun up to about 3,200 RPM for starting.
Source
At the speeds the SR-71 operated, surface temperatures were extremely high due to aerodynamic heating: 800 degrees at the nose, 1,200 degrees on the engine cowlings, 620 degrees on the cockpit windshield. Because of the operating altitudes, speeds, and temperatures, Lockheed designers were forced to work at the cutting edge of existing aerospace technology, and well beyond in many cases. Many features and systems simply had to be invented as they were needed, since conventional technology was inadequate to the task. New oils, hydraulic fluids, sealants, and insulations were created to cope with the ultra-high temperatures the craft would encounter. A new type of aviation fuel, JP-7, was invented that would not "cook off" at high operating temperatures, having such a low volatility and high flash point that it required the use of triethylborane as a chemical ignitor in order for combustion to take place. The fuel itself was rendered inert by the infusion of nitrogen and then circulated around various components within the airframe as a coolant before being routed into the J58 engines for burning.
Source
It burns an extremely low vapor pressure fuel called JP-7, which was formulated specially for the SR-71. You can put a cigerette out in a dish of JP-7. The fuel is designed to be hard to light because the airframe skin in the vicinity of the fuel tank is 500 - 600 degrees F at cruise. Even worse, the fuel is actually used as the hydraulic fluid in the engine actuators! The idea is, a steady supply of "cool" fluid arrives from the fuel tanks and gets used in hydraulic devices around the engine. Hydraulic fluid in a closed system would soon get as hot as the parts through which it ran - - but this special fluid gets used as fuel before it gets too hot! Afterburner ignition is spectacular, when an ultra-hot flash of Tetra-Ethyl Borane ("TEB") is squirted into the flame holders.Source
Originally posted by cmdrkeenkid
Originally posted by Aim64C
The conditions of the retirement of the SR-71 were rather odd... the plane is suddenly retired with no known replacement, other than the U-2 ...
And the myriad of spy satellites that the USAF and other departments have up there flying about.
Originally posted by Aim64C
I sent a u2u thing to you GSA.... I think.... only after I sent one did I figure out where the rather obviously placed 'send u2u' button was.... so I have no idea if it was formatted correctly.
We really need a better quality shot than the one on photobucket - it has some very heavy color 'lumping' - putting too many colors together into one.
This is partly why the SR-71 looks a little too photogenic there.... because most of the pixels making it up are solid black...... but most of the pixels making up those clumps of leaves are solid colors as well - so ......
I tried running down the markings on the UAVs - WA - the only correlation I have found is that these are the variant of the Predator that carried to AGM-114 Hellfire missiles...... I'll see if I can find more on them. However, I still have yet to figure out what the WA stands for... unless................... there was a UAV on the list called "warrior" ...... I'll go check that one out... standby for report....
Nevermind - Warrior isn't slated until 2007 - so that's not right....... crap.... I wonder if Intelgurl knows anything about the UAV marking system.... I haven't paid that much attention to them.
Originally posted by GSA
how in hells name am I supposed to know the answers to those ???
Originally posted by Aim64C
Just curious.... what happens if this checks out? What then?
Originally posted by cmdrkeenkid
Originally posted by GSA
how in hells name am I supposed to know the answers to those ???
You took the picture, didn't you?
Originally posted by GSA
img523.imageshack.us...