A rocket turbine engine is a combination of two types of propulsion engines: a

liquid-propellant rocket A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses liquid propellants. Liquids are desirable because they have a reasonably high density and high specific impulse (''I''sp). This allows the volume of the propellant ta ...

and a turbine

jet engine A jet engine is a type of reaction engine discharging a fast-moving jet (fluid), jet of heated gas (usually air) that generates thrust by jet propulsion. While this broad definition can include Rocket engine, rocket, Pump-jet, water jet, and ...

. Its

power-to-weight ratio Power-to-weight ratio (PWR, also called specific power, or power-to-mass ratio) is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measuremen ...

is a little higher than a regular jet engine, and works at higher altitudes. "Testing of a novel propulsion system for micro air vehicles" ''Pfoceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering" Volume 215, Number 4, pages 207-218 / 200

References

Jet engines Rocket engines {{aviation-stub