XCOR EZ-Rocket

The XCOR EZ-Rocket is a test platform for the XCOR rocket propulsion system. The airplane is a modified Rutan Long-EZ, with the propeller replaced by first one, then later a pair of pressure-fed regeneratively cooled liquid-fuelled rocket engines and an underslung fuel tank. The engines are restartable in flight, and are contained within Kevlar armor shielding. The EZ-Rocket is registered as an experimental aircraft.

The first flight took place on July 21, 2001, flown by test pilot Dick Rutan.

On a typical flight, the EZ-Rocket takes off on rockets, gains altitude for a minute or so, then switches off the rockets and glides to a deadstick landing.

The vehicle actually flies better during deadstick glide landings than a Long-EZ due to lack of drag from a stationary pusher propeller — the vehicle's aerodynamics are cleaner in spite of its belly tank. It is also lighter due to the lack of a piston engine (the rocket propulsion system is significantly lighter), so enjoys significantly lower wing loading than a stock Long-EZ.

When XCOR began flying its EZ-Rocket in 2001, the company decided to have it FAA certified as an experimental aircraft, avoiding the additional time required to seek a launch vehicle license from the Office of Commercial Space Transportation (AST). Jeff Greason, a co-founder of XCOR, said on February 10, 2003 if they were starting out at that time they probably would seek an AST license due to the progress made in developing a regulatory regime for suborbitals.

The Rocket Racing League aircraft currently in development, the Mark-III X-racer, is a design descendant of the EZ-Rocket aircraft. Although XCOR is not the developer of the rocket engine for the Mark-III, XCOR did develop the rocket engine for the Mark-I X-Racer, the first of the X-Racers to use a single rocket engine on a Velocity SE basic airframe, and the first X-Racer to utilize kerosene instead of isopropyl alcohol fuel. XCOR used both design and operational experience from the EZ-Rocket in the Mark-I rocket aircraft design.

...
Wikipedia