The Mark-III (N133XP) airframe was modified during manufacturing at Velocity Aircraft explicitly for use as a rocket racer, with canopy top, center seat and control stick, and other enhancements.
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The RRL has been called "NASCAR with rockets", The Rocket Racer flew for a public audience at the 2008 EAA AirVenture Airshow at Oshkosh, Wisconsin.
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The Rocket Racing League is utilizing a highly modified Velocity XL FG airframe and an Armadillo Aerospace 2,500 pound thrust liquid oxygen (LOX) and ethanol rocket engine in both its Mark-II X-Racer and Mark-III X-Racer demonstration vehicles.