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<!--BEGIN SPECIFICATIONS--> X-15 Specifications Primary Function: Experimental Aircraft Contractor: North American Crew: One Unit Cost: N/A Powerplant Reaction Motors XLR-99 rocket engine of over 50,000 lbs. thrust Dimensions Length: 50 ft. 3 in. Wingspan: 22 ft. 4 in. Height: 11 ft 7 in. Weights Empty: N/A Maximum Takeoff: 31,275 lb -- gross Performance Speed: 4,104 mph (Mach 6.06) Ceiling: 354,200 ft (set by X-15A #3) Range: 275 miles Armament N/A X-15A-2 (#2 after modifications) Specifications Primary Function: Experimental Aircraft Contractor: North American Crew: One Unit Cost: N/A Powerplant Reaction Motors XLR-99 rocket engine of over 50,000 lbs. thrust Dimensions Length: 52 ft. 4.5 in. Wingspan: 22 ft. 3 in. Height: 12 ft. 1 in. Weights Empty: N/A Maximum Takeoff: 56,132 lb -- gross Performance Speed: 4,520 mph (Mach 6.70) Ceiling: 314,750 ft Range: 250 miles Armament N/A <!--END SPECIFICATIONS--> <!--BEGIN ACHIEVEMENTS--> X-15 Achievements The X-15 is one of the fastest and highest flying aircraft in the world, reaching a top speed of over mach 6.7 and an altitude of more than 350,000 ft. <!--END ACHIEVEMENTS--> <!--BEGIN FEATURES--> <!-- X-15 Features --> <!--END FEATURES--> <!--BEGIN BACKGROUND--> X-15 Background On March 10, 1959, North American pilot Scott Crossfield completed the first captive-carry flight under the B-52 mothership. Again on June 8, 1959, Crossfield made the X-15's first glide flight -- reaching a speed of 522mph (mach 0.79) from the release altitude of 37,550ft. The X-15 was created under the USAF project MX-1226. Since the expected XLR99 rocket motor (rated at 57,850lb.) wasn't available at first, the X-15 was powered by two XLR11 rocket motors rated at 8,000lb. thrust each for a short time. It reached a top speed of mach 2.11 (1,455mph) and a ceiling of 52,341ft during the first powered flights with the XLR11's. On November 9, 1962, an engine failure made pilot Jack McKay make an emergency landing at Mud Lake, Nevada. Upon landing, the landing gear collapsed and the X-15 flipped over. The pilot survived, but was forced to retire due to injuries. The X-15A #2 was sent back to North American, where it went through extensive repairs and modifications. When X-15A-2 returned to Edwards in February 1964, it was equipped with a longer fuselage and external fuel tanks. On the last X-15 flight (flight number 199) on October 3, 1967, Captain William Knight took the X-15A-2 to 102,100ft. and mach 6.70 (4,520mph). X-15A-2 was the fastest of the 3 built, and X-15A #3 was the highest flying (354,200ft.). X-15A-2 is on display at the USAF Museum in Dayton, Ohio. X-15A #1 is on permanent display at the National Air and Space Museum in Washington D.C. X-15A #3 disintegrated after the aircraft entered a spin during re-entry at mach 5. At around 18,600ft the aircraft started to dive with high frequency pitch oscillations. When X-15A #3 reached 15Gs, the plane broke up -- killing its pilot Michael J. Adams. The X-15 was the first aircraft to exceed mach 4, 5, and 6 -- and it was the first aircraft to exceed 100,000ft, 200,000ft, and 300,000ft altitude.Summary Copyright © Charles M (JetWhiz) <!--END BACKGROUND-->
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