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Originally posted by Sam60notwithstanding Zorgon will probably beat me to it!
Originally posted by JayinARJust that these photos I keep seeing aren't necessarily proof of that.
Originally posted by LSWONE
Black= Ninjas!
Originally posted by JayinAR
I'm not a meteorological expert or anything, but I have seen regular passenger jets leave vapor trails that take on the 'doughnut' appearance after flying over.
I think it has something to do with the atmospheric conditions.
Not saying that we *don't* have some sort of pulse directed propulsion systems in our arsenal. Just that these photos I keep seeing aren't necessarily proof of that.
Originally posted by JayinAR
I'm not a meteorological expert or anything, but I have seen regular passenger jets leave vapor trails that take on the 'doughnut' appearance after flying over.
I think it has something to do with the atmospheric conditions.
Not saying that we *don't* have some sort of pulse directed propulsion systems in our arsenal. Just that these photos I keep seeing aren't necessarily proof of that.
Current theoretical operation of a PDWE
Liquid methane or liquid hydrogen is ejected onto the fuselage, where the fuel mist is ignited, possibly by surface heating. The PDWE works by creating a liquid hydrogen detonation inside a specially designed chamber when the aircraft is traveling beyond the speed of sound. When traveling at such speeds, a thrust wall (the aircraft is traveling so fast that molecules in the air are rapidly pushed aside near the nose of the aircraft which in essence becomes a wall) is created in front of the aircraft. When the detonation takes place, the airplane's thrust wall is pushed forward. This process is continually repeated to propel the aircraft. From the ground the jet stream looks like "donuts-on-a-rope".
Quoted below is a small description of how a PDWE would accelerate a vehicle towards the hypersonic regime.
"...use a shock wave created in a detonation - an explosion that propagates supersonically- to compress a fuel-oxidizer mixture prior to combustion, similar to supersonic inlets that make use of external and internal shock wave for pressurization."
Not much is known about Pulse Detonation Wave technology, but there have been quite a few reports and sightings of mysterious aircraft using propulsion technology unlike any heard or seen before.
On February 25, 26, and 27, 1992, there were night-time sightings of an unknown aircraft with a "diamond-pattern" of lights at Beale Air Force Base, which was thought to be the Aurora aircraft. The aircraft had a distinctive engine noise, described as "a very, very low rumble, like air rushing through a big tube." On the night of February 26, what was thought to be a ground test of Aurora's propulsion systems took place. A series of "booms" was heard and described as similiar to "artillery fire" and "deep bass notes, not like sonic booms." It was thought these were "light-off" tests of the engines. It was speculated that the aircraft was using Pulse Detonation Wave Engines. The noise and low frequency would, it was said, be consistent with PDWE technology.
It has also been noted that despite the famous "Donuts-on-a-rope" air contrails not being consistent with Aurora's propulsion system, theses contrails can be produced by a PDWE operating outside of its specified parameters.
Interpreting known information
Although the observations recorded of vehicles with an unusual trailing contrail and noise are intriguing, they are also difficult to reconcile with one another. While many observers agree on the unusual sounds created by these vehicles, a range of descriptions are provided as to the nature of these sounds. The pulsating tone emanating from these sightings has been taken as an indication of the use of some form of pulse detonation wave engine. Some observers report a characteristic frequency as high as 60 Hertz, while others suggest a frequency as low as 1 Hertz.
But a technical analysis of pulse detonation wave engines suggests that engines operating at the thrust levels associated with military aircraft would operate between 100 and 200 Hertz (pulses per second). While doppler shifting may reconcile this value with the reported 50-60 Hertz pulsation, it is more difficult to reconcile this with the reports of a 1 Hertz pulsation.
It is also difficult to reconcile a pulse rate of 100-200 Hertz with the observed donut-on-a-rope contrails. The association of these contrails with a PDWE would seem to be predicated on the observation that each "donut" is a product of a single pulse detonation. Based on published photographs, the "donuts" appear to be approximately 100 meters apart. Assuming a detonation pulse rate of 100 Hertz, this would imply a velocity of 10 kilometers per second, roughly Mach 36 which is 1½ times orbital velocity. While it is asserted that the Aurora spyplane is a high-speed vehicle, this is at least four times faster than the speeds normally associated with this aircraft.
In addition, a closer examination of the published photographs reveals a significant irregularity in the spacing between the donuts on the rope. This would seem to be inconsistent with the normal functioning of a pulse detonation wave engine.
www.scientificamerican.com...
When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
Originally posted by Phage
reply to post by Sam60
Actually, "donut on a rope" contrails are unrelated to the propulsion system of the aircraft, they are an aerodynamic effect. Due to an effect known as Crow Instability, the wingtip vortices of the aircraft interact with each other producing a series of vortex rings in the wake of the plane. Contrails become entrained in the rings forming a series of donuts.
www.scientificamerican.com...
When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
Originally posted by Chadwickus
reply to post by Chadwickus
Oh come on, please...a sonic boom means more than a sound?
What is that supposed to mean? Is HAARP creating sonic booms too is it?
Zorgon, did you miss my questions regarding the oil rigs and old air bases on page one?
Sonic boom is an impulsive noise similar to thunder. It is caused by an object moving faster than sound, about 750 miles per hour at sea level. An aircraft traveling through the atmosphere continuously produces air-pressure waves similar to the water waves caused by a ship's bow. When the aircraft exceeds the speed of sound, these pressure waves combine and form shock waves which travel forward from the generation or "release" point.
As an aircraft flies at supersonic speeds it is continually generating shock waves, dropping sonic boom along its flight path, similar to someone dropping objects from a moving vehicle. From the perspective of the aircraft, the boom appears to be swept backwards as it travels awayfrom the aircraft. If the plane makes a sharp turn or pulls up, the boom will hit the ground in front of the aircraft./ex]
The sound heard on the ground as a "sonic boom" is the sudden onset and release of pressure after the buildup by the shock wave or "peak overpressure." The change in pressure caused by sonic boom is only a few pounds per square foot, about the same pressure change we experience on an elevator as it descends two or three floors, in a much shorter time period. It is the magnitude of this peak overpressure that describes a sonic boom.
www.sky-flash.com...
[edit on 15-8-2009 by wonderworld]
"Breaking the sound barrier" creates no visible effects.