Future Aircrafts & Dajjal's Donkey
The X-51A Waverider hypersonic scramjet project is set for its second test flight today, and the U.S. Air Force hopes it will demonstrate technology that can eventually be used for more efficient transport of payloads into orbit. The craft will be carried to 15,240 meters (50,000 ft.) by a B-52 from Edwards Air Force Base in California, and be dropped over the Pacific Ocean. A booster rocket will fire, getting the Waverider to Mach 4.5; then the scramjet will kick in, and designers hope it will reach Mach 6 or more.
The X-51 Waverider program is a cooperative effort of the Air Force, DARPA, NASA, Boeing and Pratt & Whitney Rocketdyne.
Concept of Future Jet Engines:
The scramjet is an air-breathing engine, where intake air blows through its combustion chamber at supersonic speeds. This has been compared to lighting a match in a hurricane, and the concept has had limited success. The engine has no moving parts, and the oxygen needed by the engine to combustion is taken from the atmosphere passing through the vehicle, instead of from a tank on board, making the craft smaller, lighter and faster. Designers say it could reach speeds of anywhere from Mach 12 to Mach 24. Mach 24 is more than 29,000 km/hour (18,000 miles per hour.) This could cut an 18-hour trip to Tokyo from New York City to less than 2 hours.
Boeing Phantom Works has partnered with NASA and the Air Force Research Laboratory to study the structural, aerodynamic and operational advantages of the Blended Wing Body concept, a cross between a conventional plane and a flying wing design. The Air Force has designated the prototype the X-48B based on its interest in the design's potential as a multi-role, long-range, high-capacity military transport aircraft. The 8.5 percent scale, remotely piloted X-48B is dynamically scaled to fly much like the full-size aircraft would fly.
Following completion of installation of test instrumentation, one of two X-48B Blended Wing Body technology demonstrators began flight tests at NASA's Dryden Flight Research Center in early 2007, and those tests are continuing into 2008. Researchers at NASA's Langley Research Center in Hampton, Va., tested the second X-48B prototype aircraft in Langley's historic full-scale wind tunnel in the spring of 2006, and the flight tests are intended in part to validate the results of those wind tunnel tests.
Advantages of the blended wing-body concept include high fuel efficiency, low noise and a large payload volume for the size of the aircraft. Flight testing at NASA Dryden will focus on the low-speed, low-altitude flight characteristics of the blended wing-body configuration, including engine-out control, stall characteristics and handling qualities. The short flight test program is intended to demonstrate that the novel design can be flown as safely as current transports having a traditional fuselage, wings and tail configuration.
The two X-48B Blended Wing Body technology demonstration aircraft were built by Cranfield Aerospace in the United Kingdom to Boeing's specifications. The subscale prototypes have a wingspan of 20.4 feet, with prominent vertical fins and rudders at the wingtips and elevons along the trailing edges of the wings. The 523-lb. gross weight aircraft are powered by three small model aircraft turbojet engines providing a maximum combined thrust of about 160 lbs. The X-48B has an estimated top airspeed of 118 knots (139 mph), a maximum altitude of about 10,000 feet and a flight duration of about 40 minutes.
Dajjal's Donkey:
The Dajjāl uses a special kind of donkey possessing two enormous ears, each of which is at least 30 arms-lengths, moving in the skies, with the clouds so near he can reach them with his hand and it travels faster than the sun going to its sunset.
( Kanz ul-`Ummal , `Uqd ad-Durrar, Imam al-Maqdisi.)
The Prophet (s) said, regarding the Dajjāl’s donkey:
يقول الرسول الكريم صلى الله عليه وسلم عن هذا الحمار: يأكل الحجارة ويسبقه جبل من دخان ويركب الناس في جوفه وليس على ظهره
He eats rocks and a mountain of smoke precedes him and people ride inside him, and not on his back.
in another version of this Hadith:
The Dajjāl emerges in time where there is lightness/weakness in religion and a lack of knowledge… the donkey he rides has a girth of 40 arm-lengths between its two ears [100 feet]…
(al-Hakim’s al-Mustadrak.)
Abu Hurrairah (ra) narrated that Prophet(saw) said: Dajjal will come on very white donkey.Whose span between two ears is 70 Ba.
[Bihaqqi].
Compiled from different Sources By :
Shadab Ibn Hasan
https://facebook.com/peerShadab
