X-15 

A plane in which Chuck Norris made and flew after watching and being inspired by the movie "Top Gun."

But seriously now, the North American X-15 is, to date, the fastest and highest-flying aerodynamically supported machine ever built.

Compared to the SR-71 Blackbird, the X-15s closest rival, in these catagories:
------Top speed--Highest altitude
SR-71__Mach 3_______89,000 ft.
X-15__Mach 6.72____354,200 ft.

Person 1: You know that the X-15 burned more than 16.5 tons of rocket fuel in 3 minutes on its record breaking flights?
Person 2: Damn, that truely is Chuck Norris' kind of plane.

X-15 by Muffen-Man May 2, 2009

X-15 

A 1 manned, rocket propelled air/spacecraft that can go over the Von Karmen line(space).

The x-15 is the shit because it can go into space.

X-15 by RMortensen April 1, 2007

1.5 x 10^28" 

1. The standard wheel size for the Bentalade.
2. Also the diameter of the known universe.

Put 1.5 x 10^28" rims on tha Escalade.
Shit shat shitty shat, thems the 1.5 x 10^28" rims.

1.5 x 10^28" by Sly O.D. March 5, 2007