2008 / 10 / 26 Update.

Bell Aerospace Textron	Bell X-1 (XS-1) Super Sonic Experimental Rocket Aircraft Length : 9.45m Wing Span : 8.53m Hight : 3.30m Wing Area : 12.08 Square Meter All-Up Weight : 5,440Kg Engine : Reaction Motors XLR11-RM-3 Rocket (2,720Kg) X 1 Max Speed : 1,730Km/h (Mach 1.45) Service Ceiling : 21,750m+ Crew : 1
Bell Aerospace Textron	Bell X-1A Super Sonic Experimental Rocket Aircraft Length : 10.84m Wing Span : 8.53m Hight : 3.25m Wing Area : 12.08 Square Meter All-Up Weight : 7,477Kg Engine : Reaction Motors XLR11-RM-5 Rocket (2,720Kg) X 1 Max Speed : 2,912Km/h (Mach 2.44) Service Ceiling : 27,566m Crew : 1
NASA	Bell X-1B Super Sonic Experimental Rocket Aircraft Length : 10.84m Wing Span : 8.53m Hight : 3.25m Wing Area : 12.08 Square Meter All-Up Weight : 7,477Kg Engine : Reaction Motors XLR11-RM-9 Rocket (2,720Kg) X 1 Max Speed : 2,745Km/h (Mach 2.3) Service Ceiling : 19,812m Crew : 1
Bell Aerospace Textron	Bell X-1C Super Sonic Rocket Fighter Project This Project was Cancelled ! Length : 10.84m Wing Span : 8.53m Hight : 3.25m Wing Area : 12.08 Square Meter All-Up Weight : 7,477Kg Engine : Reaction Motors XLR11-RM-9 Rocket (2,720Kg) X 1 Max Speed : 2,745Km/h (Mach 2.3) Service Ceiling : 19,812m Crew : 1 Armament : 12.7mm Machine Gun X 1
Bell Aerospace Textron	Bell X-1D Super Sonic Experimental Rocket Aircraft Length : 10.84m Wing Span : 8.53m Hight : 3.25m Wing Area : 12.08 Square Meter All-Up Weight : 7,477Kg Engine : Reaction Motors XLR11-RM-5 Rocket (2,720Kg) X 1 Crew : 1
NASA	Bell X-1E Super Sonic Experimental Rocket Aircraft Length : 9.45m Wing Span : 6.96m Hight : 3.30m Wing Area : 10.68 Square Meter All-Up Weight : 6,682Kg Engine : Reaction Motors LR8-RM-5 Rocket (5,440Kg) X 1 Max Speed : 2,912Km/h (Mach 2.44) Service Ceiling : 22,860m+ Crew : 1
	Bell X-1 Foward Swept Wing This Project was Cancelled !
USAF	Bell X-2 Super Sonic Swept Back Wing Experimental Rocket Aircraft Length : 13.84m Wing Span : 9.83m Hight : 3.58m Wing Area : 24.19 Square Meter All-Up Weight : 11,300Kg Empty Weight : 5,613Kg Engine : Curtiss Right XLR25-CW-1 Rocket (6,804Kg) X 1 Max Speed : 3,814Km/h (Mach 3.196) Service Ceiling : 38,466m+ Crew : 1
USAF	Duglas X-3 Stiletto Super Sonic Experimental Jet Aircraft Length : 20.35m Wing Span : 6.92m Hight : 3.82m Wing Area : 15.47 Square Meter All-Up Weight : 9,435Kg Empty Weight : 6,507Kg Engine : Westinghouse J34-WE-47 Turbojet (2,200Kg) X 2 Max Speed : 1,134Km/h (Mach 0.95) Service Ceiling : 11,580m Crew : 1
USAF	Northamerican X-15 Hypersonic flight at high altitude Aircraft Length : 15.32m Wing Span : 6.8m Hight : 3.55m Wing Area : 18.58 Square Meter All-Up Weight : 14,186Kg Empty Weight : 5,195Kg Engine : Reaction Motors XLR11 Rocket (3,630Kg) X 2 Max Speed : 4,176Km/h (Mach 3.5) Service Ceiling : 41,600m Crew : 1
USAF	Northamerican X-15A-2 Hypersonic flight at high altitude Aircraft The final version of X-15. Length : 15.99m Wing Span : 6.8m Hight : 3.70m Wing Area : 18.58 Square Meter All-Up Weight : 25,461Kg Empty Weight :8,319Kg Engine : Reaction Motors XLR99 Rocket (26,240Kg) X 1 Max Speed : 7,995Km/h (Mach 6.7) Service Ceiling : 107,960m Crew : 1
Rockwell	Northamerican X-15-3 Hypersonic flight at high altitude Aircraft (Delta Wing Version) The project was cancelled.
NASA	X-43A Hyper-X Hyper Sonic Unmanned Vehicle Length : approximately 3.66m Engine : Ramjet & Scramjet Speed : 5,966 - 11,933Km/h (Mach 5 - 10)
	X-51 Hyper Sonic Unmanned Scramjet Vehicle Engine : Rocket & Scramjet Speed : 86,5593Km/h (Mach 7)