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Cappuccio said the company is also exploring technologies to enable low boom, supersonic flight over land and global reach.
As I said, NASA looked at it, and rejected it, with no substantive
critique or description of why it would not work, except that we got
the impression that they considered shock waves to be some sort of law
In 1996, Seebass (by then a professor at the University of Colorado) analyzed the sonic-boom signature of an SBJ. His analysis showed that it was possible to achieve a peak overpressure of less than 0.45 lbs/ft2 and that such a low boom aircraft "could be certified to fly over land at supersonic speeds."
Originally posted by Arawn
Science tells us ? Yes the science that we have learnt on Earth...
Originally posted by Zenem
It is specualated that alot of the UFOs that are seen may be unmanned crafts kinda like UAVs. The mothership is where the Aliens would chill so maybe they wouldnt need to worry about inertia because theres no-one inside to go splat?
Okay so we know that once a certain velocity is reached the sound barrier breaks. But that knowledge is taken from the science that we use (controlled blowing stuff up) to make stuff move.
Depending on the aircraft's altitude, sonic booms reach the ground two to 60 seconds after flyover. However, not all booms are heard at ground level. The speed of sound at any altitude is a function of air temperature. A decrease or increase in temperature results in a corresponding decrease or increase in sound speed. Under standard atmospheric conditions, air temperature decreases with increased altitude. For example, when sea-level temperature is 58 degrees Fahrenheit, the temperature at 30,000 feet drops to minus 49 degrees Fahrenheit. This temperature gradient helps bend the sound waves upward. Therefore, for a boom to reach the ground, the aircraft speed relative to the ground must be greater than the speed of sound at the ground. For example, the speed of sound at 30,000 feet is about 670 miles per hour, but an aircraft must travel at least 750 miles per hour (Mach 1.12, where Mach 1 equals the speed of sound) for a boom to be heard on the ground.
You have voted Lecter for the Way Above Top Secret award.
Originally posted by Lecter
If a UFO accelerates and vanishes almost instantly out of sight wouldnt there be a sonic boom from such acceleration?
We've solved the problem by creating an artificial reaction to the
circulation with an underwing air jet (using a small amount of bleed
air from the first stage of the compressor) that recaptures the
compression waves before they can coalesce into shock waves. We're
fooling mother nature by introducing additional energy into the air
flow, and adding in the energy term in Crocco's equation that normally
gets zeroed out because of the assumption of constant speed and
altitude at cruise. When you do this, you can eliminate the entropy
Originally posted by Allred5923
BTW, "Kudos" on you and Matyas's thread, I have read every bit of it and it is a very practical theory, hope that it is all well and good!!-)